Pregnant Weight Gain Calculator
Weight gain during pregnancy is a natural and important part of supporting your baby’s growth and your body’s changing needs. However, many expecting mothers wonder how much weight they should gain, whether their current weight gain is within a recommended range, and how pregnancy weight gain changes from week to week.
Our Pregnant Weight Gain Calculator is a free online tool designed to help you estimate your recommended pregnancy weight gain based on your pre-pregnancy weight, height, current weight, pregnancy week, and whether you’re expecting one baby or twins.
The calculator uses your pre-pregnancy Body Mass Index (BMI) to identify a general recommended total weight gain range. It also estimates how much weight you may have gained by your current pregnancy week and compares that estimate with your recorded weight change.
Whether you’re in your first trimester, second trimester, or third trimester, this pregnancy weight gain calculator can help you better understand general pregnancy weight gain recommendations.
The tool supports both kilograms and pounds, along with height measurements in centimeters or feet and inches.
It also provides separate estimated weight gain ranges for singleton and twin pregnancies.
Important: Pregnancy weight gain varies between individuals. This calculator provides general educational estimates based on commonly used pregnancy weight gain guidance. It cannot determine whether your pregnancy is progressing normally or whether your weight gain is medically appropriate. Always discuss your pregnancy weight and health with your prenatal healthcare professional.
What Is a Pregnant Weight Gain Calculator?
A Pregnant Weight Gain Calculator is an online pregnancy health tool that estimates recommended weight gain during pregnancy using your pre-pregnancy BMI and pregnancy details.
During pregnancy, your body undergoes several physical and biological changes.
Weight gain can result from your baby’s growth, placenta development, amniotic fluid, increased blood volume, breast tissue changes, body fluid, and additional energy stores.
Because these changes occur throughout pregnancy, gaining weight is generally expected.
However, the recommended amount of weight gain is not the same for everyone.
For example, someone who was underweight before pregnancy may receive a higher recommended total weight gain range than someone who entered pregnancy with a higher BMI.
Our calculator considers your pre-pregnancy BMI when estimating these ranges.
It provides the following results:
- Pre-pregnancy BMI: Your estimated BMI before pregnancy.
- BMI Category: Your pre-pregnancy weight classification.
- Weight Gained So Far: The difference between your current weight and pre-pregnancy weight.
- Recommended Total Gain: A general estimated total pregnancy weight gain range.
- Estimated Gain by This Week: A broad estimate of cumulative weight gain for your selected pregnancy week.
- Difference From Estimated Range: Whether your recorded weight change is below, within, or above the calculator’s estimated range.
These results can help you prepare questions for your prenatal care appointments and better understand general pregnancy weight gain guidance.
How to Use the Pregnant Weight Gain Calculator
Our pregnancy weight gain calculator is designed to be simple and convenient.
Follow these steps to estimate your pregnancy weight gain.
Step 1: Select Your Weight Unit
First, choose your preferred weight measurement system.
The calculator supports two options:
Kilograms (kg): Suitable for people who use metric measurements.
Pounds (lb): Suitable for people who prefer US customary measurements.
For example, you can enter your weight as 65 kilograms or approximately 143 pounds.
Make sure your pre-pregnancy weight and current weight use the same selected unit.
The calculator automatically converts pounds into kilograms when performing BMI and weight gain calculations.
Step 2: Choose Your Height Unit
Next, select your preferred height measurement system.
You can choose:
Centimeters (cm)
Feet and Inches
If you select centimeters, enter your height directly.
For example:
Height = 165 cm
If you select feet and inches, enter your height in two separate fields.
For example:
Feet = 5
Additional Inches = 5
This represents a height of 5 feet 5 inches.
Accurate height information is important because it affects your pre-pregnancy BMI calculation.
Step 3: Enter Your Height
Enter your height using the selected unit.
For example:
Height = 165 cm
Or:
Height = 5 feet 5 inches
The calculator uses this measurement to determine your pre-pregnancy BMI.
BMI helps identify which general pregnancy weight gain recommendation applies.
Step 4: Enter Your Pre-Pregnancy Weight
Next, enter your body weight before pregnancy.
For example:
Pre-Pregnancy Weight = 60 kg
Your pre-pregnancy weight is one of the most important inputs because pregnancy weight gain recommendations are commonly based on BMI before pregnancy.
If you don’t know your exact pre-pregnancy weight, discuss an appropriate estimate with your healthcare professional.
Step 5: Enter Your Current Weight
Enter your current body weight.
For example:
Current Weight = 67 kg
The calculator compares your current weight with your pre-pregnancy weight.
Using the example above:
67 − 60 = 7 kg
This means your recorded weight gain so far is 7 kilograms.
The calculator can also display negative weight changes if your current weight is lower than your pre-pregnancy weight.
Step 6: Enter Your Current Pregnancy Week
Enter how many weeks pregnant you are.
The calculator accepts pregnancy weeks from 1 to 42.
For example:
Pregnancy Week = 24
Your pregnancy week helps the calculator estimate how much weight gain might have accumulated by that point.
Pregnancy weight gain generally changes over time, and the rate is not necessarily consistent throughout pregnancy.
Step 7: Select Your Pregnancy Type
Choose whether you’re expecting one baby or twins.
The available options are:
Single Baby: Uses general singleton pregnancy weight gain recommendations.
Twins: Uses separate estimated total weight gain ranges for twin pregnancies.
Twin pregnancies often involve different nutritional and weight gain considerations.
The calculator accounts for this difference when determining total recommended weight gain.
However, individual twin pregnancy recommendations require professional assessment.
Step 8: Click Calculate
After entering your information, click the Calculate button.
The calculator instantly displays your estimated pregnancy weight gain results.
You can review your pre-pregnancy BMI, recommended total gain, current weight change, and estimated gain for your selected pregnancy week.
Step 9: Review Your Results
The calculator compares your recorded weight gain with its estimated weekly range.
It may display one of three general outcomes:
Within Estimated Range: Your recorded gain falls inside the calculator’s broad estimate.
Below Estimated Range: Your recorded gain is lower than the estimated minimum.
Above Estimated Range: Your recorded gain exceeds the estimated maximum.
These results do not diagnose a pregnancy complication.
They are informational comparisons that should be discussed with your prenatal healthcare professional when appropriate.
Step 10: Reset the Calculator
To perform another calculation, click Reset.
This clears your previous entries.
You can repeat the calculation as your pregnancy progresses.
Pregnant Weight Gain Calculator Formula
Our calculator uses several formulas to estimate pregnancy weight gain.
These calculations include pre-pregnancy BMI, current weight gain, total recommended gain, and estimated cumulative gain by pregnancy week.
1. Pre-Pregnancy BMI Formula
The first calculation determines your pre-pregnancy BMI.
The formula is:
BMI = Pre-Pregnancy Weight (kg) ÷ [Height (m)]²
Where:
Pre-Pregnancy Weight: Your weight before pregnancy in kilograms.
Height: Your height in meters.
For example:
Pre-Pregnancy Weight = 60 kg
Height = 1.65 m
BMI = 60 ÷ (1.65 × 1.65)
BMI = 60 ÷ 2.7225
Pre-Pregnancy BMI ≈ 22.0
This falls within the standard adult normal-weight BMI category.
2. Pregnancy Weight Gained Formula
The calculator determines how much weight you have gained using:
Weight Gained = Current Weight − Pre-Pregnancy Weight
For example:
Current Weight = 68 kg
Pre-Pregnancy Weight = 60 kg
Weight Gained = 68 − 60
Weight Gained = 8 kg
If the result is negative, it indicates that your current recorded weight is lower than your pre-pregnancy weight.
3. Estimated Weekly Pregnancy Weight Gain Formula
The calculator uses a simplified mathematical model to estimate cumulative weight gain by your selected pregnancy week.
For weeks 1–13:
Estimated Cumulative Gain = 0–2 kg
For weeks after 13:
Estimated Minimum Gain = 0.5 + [(Pregnancy Week − 13) × (Recommended Minimum Total Gain ÷ 27)]
Estimated Maximum Gain = 2 + [(Pregnancy Week − 13) × (Recommended Maximum Total Gain ÷ 27)]
The calculator applies this general calculation to singleton and twin pregnancies using their respective total gain ranges.
Important limitation: This is a simplified calculator model, not a validated week-by-week clinical weight gain chart. It should not be interpreted as a medically prescribed weekly target. Its estimates can also exceed the stated total recommended gain near the end of pregnancy.
4. Difference From Estimated Range
The calculator compares your recorded gain with the estimated range.
If your recorded gain is below the estimated minimum:
Difference = Estimated Minimum Gain − Actual Gain
If your recorded gain is above the estimated maximum:
Difference = Actual Gain − Estimated Maximum Gain
If your weight gain falls within the estimated range, the calculator displays:
Within Estimated Range
This comparison helps explain the calculator’s results but does not establish whether your weight gain is appropriate for your individual pregnancy.
Example: Calculate Pregnancy Weight Gain at 24 Weeks
Let’s understand how the calculator works with a practical example.
Suppose an expecting mother enters the following information:
Height: 165 cm
Pre-Pregnancy Weight: 60 kg
Current Weight: 67 kg
Pregnancy Week: 24
Pregnancy Type: Single Baby
Step 1: Calculate Pre-Pregnancy BMI
BMI = 60 ÷ 1.65²
BMI = 60 ÷ 2.7225
BMI ≈ 22.0
This falls within the normal-weight BMI category.
Step 2: Determine Recommended Total Weight Gain
For a singleton pregnancy with a pre-pregnancy BMI between 18.5 and less than 25, the calculator uses a recommended total gain range of:
11.5–16 kg
Step 3: Calculate Weight Gained So Far
Weight Gained = 67 − 60
Weight Gained = 7 kg
Step 4: Calculate Estimated Gain at 24 Weeks
Pregnancy Week = 24
Weeks After First Trimester = 24 − 13
Later Weeks = 11
Estimated Minimum Gain:
0.5 + (11 × 11.5 ÷ 27)
= 0.5 + 4.69
Minimum ≈ 5.2 kg
Estimated Maximum Gain:
2 + (11 × 16 ÷ 27)
= 2 + 6.52
Maximum ≈ 8.5 kg
Step 5: Compare Actual Weight Gain
Actual Weight Gain = 7 kg
Estimated Range = 5.2–8.5 kg
Since 7 kg falls within the estimated range, the calculator displays:
Within Estimated Range
Final Pregnancy Weight Gain Results
| Measurement | Estimated Result |
|---|---|
| Pre-Pregnancy BMI | 22.0 |
| BMI Category | Normal Weight |
| Weight Gained So Far | 7.0 kg |
| Recommended Total Gain | 11.5–16.0 kg |
| Estimated Gain at 24 Weeks | 5.2–8.5 kg |
| Difference From Estimated Range | Within Estimated Range |
These results are general estimates.
Your healthcare professional can determine whether your weight gain pattern is appropriate based on your pregnancy history and overall health.
Recommended Pregnancy Weight Gain by BMI
Pregnancy weight gain recommendations commonly depend on pre-pregnancy BMI.
The National Academies’ Institute of Medicine guidelines, also used in CDC educational guidance, provide general total weight gain ranges for adults with singleton pregnancies.
Recommended Weight Gain for a Single Baby
| Pre-Pregnancy BMI | BMI Category | Recommended Total Gain |
|---|---|---|
| Below 18.5 | Underweight | 12.5–18 kg |
| 18.5–24.9 | Normal Weight | 11.5–16 kg |
| 25–29.9 | Overweight | 7–11.5 kg |
| 30 or Higher | Obesity | 5–9 kg |
These ranges apply broadly to adult singleton pregnancies.
They may not be appropriate for every individual, including some adolescents or people with particular medical circumstances.
Underweight Before Pregnancy
Individuals with a pre-pregnancy BMI below 18.5 generally have a higher recommended total weight gain range.
For singleton pregnancies, the commonly cited recommendation is approximately:
12.5–18 kg (28–40 lb)
Appropriate weight gain can support fetal growth and maternal health.
Normal Weight Before Pregnancy
For individuals with a pre-pregnancy BMI between 18.5 and less than 25, the recommended total gain is approximately:
11.5–16 kg (25–35 lb)
This range is commonly used for general pregnancy weight gain planning.
Overweight Before Pregnancy
For individuals with a pre-pregnancy BMI between 25 and less than 30, the general recommendation is:
7–11.5 kg (15–25 lb)
Individual recommendations may vary depending on pregnancy health and clinical circumstances.
Obesity Before Pregnancy
For individuals with a pre-pregnancy BMI of 30 or higher, the general singleton pregnancy recommendation is:
5–9 kg (11–20 lb)
BMI alone does not determine a person’s health or nutritional requirements.
Weight gain goals should be discussed with a prenatal care professional.
Pregnancy Weight Gain Calculator for Twins
Twin pregnancies generally involve different weight gain considerations than singleton pregnancies.
Carrying twins may increase nutritional and physiological demands.
Our calculator provides separate estimated total weight gain ranges based on pre-pregnancy BMI.
Recommended Weight Gain for Twin Pregnancies
| Pre-Pregnancy BMI | Calculator’s Total Gain Range |
|---|---|
| Below 18.5 | 22.7–28.1 kg |
| 18.5–24.9 | 16.8–24.5 kg |
| 25–29.9 | 14.1–22.7 kg |
| 30 or Higher | 11.3–19.1 kg |
For adults with twin pregnancies, commonly cited guideline ranges are approximately 16.8–24.5 kg for normal pre-pregnancy BMI, 14.1–22.7 kg for overweight, and 11.3–19.1 kg for obesity.
Important: Established guidelines do not provide a similarly well-defined standard total gain range for underweight twin pregnancies. The calculator’s 22.7–28.1 kg range for this category is an unsupported estimate and should not be treated as an official recommendation.
Twin pregnancies require individualized prenatal monitoring.
Always discuss weight gain recommendations with your obstetric healthcare professional.
Pregnancy Weight Gain by Trimester
Pregnancy is commonly divided into three trimesters.
Weight gain patterns can differ during each stage.
First Trimester: Weeks 1–13
During early pregnancy, weight gain is often relatively modest.
Some people gain a small amount of weight, while others experience little change.
Nausea, vomiting, appetite changes, and other pregnancy symptoms may influence weight.
Our calculator uses a broad estimated gain range of:
0–2 kg during weeks 1–13
However, this is a simplified estimate.
Some pregnancies involve different patterns.
If you’re experiencing persistent vomiting, dehydration, or difficulty eating, contact your prenatal healthcare professional.
Second Trimester: Weeks 14–27
During the second trimester, fetal growth and maternal physiological changes generally contribute to increasing body weight.
Weight gain may become more noticeable.
Our calculator estimates cumulative weight gain by adding a calculated amount for each week after week 13.
The estimated amount depends on your pre-pregnancy BMI and pregnancy type.
Actual weight gain does not necessarily follow a perfectly linear pattern.
Third Trimester: Weeks 28–42
During the third trimester, the baby continues growing and maternal body changes may contribute to additional weight gain.
However, the rate of gain varies.
Some people gain weight steadily, while others experience temporary fluctuations.
The calculator continues applying its simplified weekly estimation formula.
Because this model is not a validated clinical trajectory, third-trimester results should be interpreted cautiously.
Why Does Weight Increase During Pregnancy?
Pregnancy-related weight gain is not simply additional body fat.
Several physiological changes contribute to the increase.
Baby’s Growth
As pregnancy progresses, your baby grows and contributes to total pregnancy weight.
Placenta Development
The placenta develops to support the exchange of nutrients, oxygen, and waste products between maternal and fetal circulation.
Amniotic Fluid
Amniotic fluid surrounds and protects the developing baby.
Its volume contributes to pregnancy weight.
Increased Blood Volume
Blood volume generally increases during pregnancy to support maternal and fetal needs.
Breast Tissue Changes
Breast tissue often changes in preparation for feeding after birth.
Increased Body Fluid
Pregnancy can involve changes in fluid balance.
Energy Stores
The body may develop additional energy stores that support pregnancy and postpartum needs.
The relative contribution of these components varies between individuals.
Why Is Healthy Pregnancy Weight Gain Important?
Appropriate pregnancy weight gain can support maternal health and fetal development.
Both insufficient and excessive weight gain may be associated with certain pregnancy risks at the population level.
However, a person’s individual risk cannot be determined from weight gain alone.
Supports Fetal Growth
Adequate maternal nutrition and appropriate weight gain help support normal fetal development.
Supports Maternal Physiological Changes
Pregnancy involves increased blood volume, tissue development, and other changes that contribute to weight gain.
Helps Guide Prenatal Monitoring
Healthcare professionals may monitor weight alongside fetal growth, blood pressure, symptoms, and other health indicators.
Encourages Individualized Nutrition Planning
Understanding general weight gain recommendations can help guide discussions about dietary needs and physical activity.
What If Your Pregnancy Weight Gain Is Below the Estimated Range?
If the calculator indicates that your recorded weight gain is below its estimated range, it does not automatically mean something is wrong.
Pregnancy weight gain varies depending on factors such as nausea, appetite, body composition, pregnancy stage, and individual health.
However, persistent weight loss, inadequate nutrition, or difficulty maintaining food and fluid intake may require professional assessment.
Your prenatal healthcare professional can evaluate your weight history and fetal growth.
Avoid attempting to rapidly increase weight without appropriate guidance.
What If Your Pregnancy Weight Gain Is Above the Estimated Range?
If your recorded weight gain exceeds the calculator’s estimated range, this does not necessarily indicate a pregnancy complication.
Weight changes can reflect normal physiological variation, fluid retention, or other factors.
However, unusually rapid weight gain may sometimes accompany fluid-related complications.
Seek prompt medical evaluation if you experience sudden swelling of the face or hands, severe headache, vision changes, upper abdominal pain, or other concerning symptoms, particularly after 20 weeks of pregnancy.
These symptoms can be associated with serious pregnancy complications and should not be assessed using a weight gain calculator.
Do not attempt restrictive dieting during pregnancy based solely on a calculator result.
Discuss any concerns with your prenatal healthcare professional.
How to Monitor Pregnancy Weight Gain Accurately
Consistent measurements can help you and your healthcare professional understand weight trends.
Use the Same Scale
Using the same reliable scale can reduce differences between measurements.
Weigh Yourself Under Similar Conditions
If your healthcare professional recommends home weight tracking, try measuring at a consistent time.
For example, morning measurements under similar conditions may be easier to compare.
Focus on Trends
Daily weight changes can occur because of fluid balance, meals, and other temporary factors.
Longer-term patterns are generally more informative than isolated measurements.
Record Your Pregnancy Week
Pregnancy weight gain should be considered in relation to gestational age.
Discuss Changes During Prenatal Visits
Your healthcare professional can interpret your weight alongside other pregnancy health measurements.
Healthy Nutrition During Pregnancy
Balanced nutrition is important throughout pregnancy.
Nutritional needs vary depending on pregnancy stage, body size, health status, and whether you’re carrying one baby or twins.
Include Protein-Rich Foods
Protein supports maternal tissue changes and fetal growth.
Examples include eggs, beans, lentils, dairy products, poultry, and appropriately prepared fish.
Eat Fruits and Vegetables
Fruits and vegetables provide vitamins, minerals, fiber, and other beneficial nutrients.
Choose Whole Grains
Whole grains can contribute carbohydrates, fiber, and essential nutrients.
Include Appropriate Healthy Fats
Foods such as nuts, seeds, olive oil, and low-mercury fish can provide beneficial fats.
Pay Attention to Important Nutrients
Pregnancy increases the importance of nutrients such as folate, iron, iodine, calcium, and vitamin D.
Your prenatal healthcare professional can recommend appropriate dietary choices and supplements.
Follow Food Safety Guidance
Pregnancy involves additional food safety considerations.
Avoid foods known to carry increased pregnancy-related infection risks and follow current guidance about fish mercury levels and safe food preparation.
Is Exercise Safe During Pregnancy?
For many people with uncomplicated pregnancies, regular moderate physical activity can provide health benefits.
Activities such as walking, swimming, and certain prenatal exercise programs may be appropriate.
However, exercise recommendations depend on pregnancy health, medical history, and individual circumstances.
Some pregnancies require activity modifications or restrictions.
Consult your prenatal healthcare professional before starting or significantly changing your exercise routine.
Exercise during pregnancy should support health and well-being rather than serve as a way to compensate for weight gain.
Benefits of Using Our Pregnant Weight Gain Calculator
Our calculator provides several useful features for general pregnancy weight monitoring.
Calculates Pre-Pregnancy BMI
The calculator automatically determines your pre-pregnancy BMI using your height and pre-pregnancy weight.
Provides BMI-Based Weight Gain Ranges
It displays general total weight gain estimates according to pre-pregnancy BMI.
Supports Singleton and Twin Pregnancies
You can select whether you’re expecting one baby or twins.
Estimates Weight Gain by Pregnancy Week
The calculator uses your current pregnancy week to generate a broad cumulative weight gain estimate.
Compares Current Gain With the Estimate
It indicates whether your recorded weight change falls below, within, or above its calculated range.
Supports Kilograms and Pounds
You can use your preferred weight measurement system.
Provides General Guidance
The results include a short explanation encouraging appropriate prenatal care and individualized assessment.
Limitations of the Pregnant Weight Gain Calculator
Although the calculator can be useful for educational purposes, it has important limitations.
First, it uses general BMI-based recommendations rather than an individualized clinical assessment.
Second, its estimated weekly weight gain model is simplified and does not reproduce a validated pregnancy weight gain chart.
Third, its week-by-week estimates can exceed the displayed recommended total gain near the end of pregnancy.
Fourth, the calculator provides an estimated underweight twin pregnancy range even though established guidelines do not provide a well-defined standard recommendation for that category.
Additionally, the calculator does not account for medical complications, fetal growth measurements, nutritional deficiencies, edema, or other clinical factors.
It also does not provide recommendations for pregnancies involving triplets or higher-order multiples.
For these reasons, the calculator should be used as a general informational tool rather than a medical decision-making system.
Frequently Asked Questions (FAQs)
1. What is a Pregnant Weight Gain Calculator?
A Pregnant Weight Gain Calculator is an online tool that estimates pregnancy weight gain recommendations based on pre-pregnancy BMI, current weight, pregnancy week, and pregnancy type.
It helps users compare their recorded weight changes with general estimated ranges.
However, the results are not a medical diagnosis.
2. How much weight should I gain during pregnancy?
Recommended weight gain depends largely on your pre-pregnancy BMI and whether you’re carrying one baby or twins.
For example, adults with a normal pre-pregnancy BMI carrying one baby are commonly advised to gain approximately 11.5–16 kg (25–35 lb) throughout pregnancy.
Individual recommendations may differ.
3. How do I calculate pregnancy weight gain?
Subtract your pre-pregnancy weight from your current weight.
The formula is:
Pregnancy Weight Gain = Current Weight − Pre-Pregnancy Weight
For example, if your pre-pregnancy weight was 60 kg and your current weight is 68 kg, your recorded gain is 8 kg.
4. How much weight should I gain in the first trimester?
Weight gain during the first trimester is generally modest.
Our calculator uses a broad estimate of 0–2 kg for weeks 1–13.
However, actual weight changes vary, and some individuals may gain less or temporarily lose weight.
Discuss persistent weight loss or difficulty eating with your prenatal healthcare professional.
5. How much weight should I gain by 20 weeks pregnant?
There is no single appropriate weight gain amount for everyone at 20 weeks.
It depends on your pre-pregnancy BMI, pregnancy type, and individual circumstances.
Our calculator provides a simplified cumulative estimate based on your pregnancy week and recommended total gain range.
Your healthcare professional can provide more appropriate individualized guidance.
6. Can I use the calculator for twin pregnancies?
Yes. The calculator includes a Twins option.
It uses separate total weight gain estimates for twin pregnancies.
However, twin pregnancy weight gain requires individualized prenatal assessment, and the calculator’s underweight twin category is not supported by a standard established guideline range.
7. Does the calculator support pounds and kilograms?
Yes. You can select either kilograms or pounds.
Enter your pre-pregnancy weight and current weight using the same selected unit.
The calculator automatically performs the necessary conversions.
8. What happens if my pregnancy weight gain is below the recommended range?
A result below the calculator’s estimated range does not automatically mean your pregnancy is unhealthy.
Weight gain patterns vary.
However, persistent weight loss or concerns about nutrition should be discussed with your prenatal healthcare professional.
9. What happens if I gain more weight than the calculator recommends?
A result above the estimated range does not automatically indicate a medical problem.
Your healthcare professional can evaluate your weight changes alongside other pregnancy health indicators.
Avoid attempting weight-loss diets during pregnancy without medical guidance.
10. Is the Pregnant Weight Gain Calculator free to use?
Yes. Our Pregnant Weight Gain Calculator is free to use.
You can enter your measurements and calculate estimated pregnancy weight gain without registration.
You can also repeat calculations as your pregnancy progresses.
Conclusion
The Pregnant Weight Gain Calculator is a convenient tool for understanding general pregnancy weight gain recommendations based on pre-pregnancy BMI, current weight, pregnancy week, and pregnancy type.
Whether you’re expecting one baby or twins, the calculator can help you estimate your total recommended pregnancy weight gain and compare your recorded weight change with a simplified weekly estimate.
It also supports kilograms, pounds, centimeters, and feet-and-inches measurements, making it accessible to users with different measurement preferences.
However, pregnancy weight gain is highly individual.
No online calculator can determine whether your weight gain is medically appropriate or whether your baby is growing normally.
The calculator’s weekly estimates are simplified and should not replace validated clinical guidance or prenatal monitoring.
Use your results to support informed discussions with your healthcare professional, and follow individualized advice throughout your pregnancy.
Use our free Pregnant Weight Gain Calculator above to estimate your pregnancy weight gain, check your pre-pregnancy BMI, and better understand general weight gain recommendations for each stage of pregnancy.