Pregnancy Weight Gain Calculator

Enter your height, weight, and pregnancy week. Also selecct if you are carrying twins or not. The calculator will help you know gradual increase in weight from 1st week of pregnancy till last week (40th).







Created By:

Emily Smith
Emily Smith

Emily Smith

Emily holds a Bachelor's degree in Computer Science from a renowned university. She continued her education with specialized courses in mathematics and data analytics.

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Verified By:



Adam holds a Master's degree in Public Health with a focus on reproductive health and epidemiology.Adam has worked closely with healthcare providers and policymakers to develop evidence-based strategies.

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Based on Research By: U.S. Department of Agriculture and U.S. Department of Health and Human Services Dietary Guidelines for Americans December 2020

Note: This tool does not suggest any medical advice. It uses your past cycles to estimate ovulation, but cannot pinpoint the exact date. This tool is used for informational purposes only and does not constitute medical advice. The calculator is not to be considered to prevent pregnancy. The results generated by this calculator depend on menstrual cycle length that might vary from woman to woman. If there’s any medical or health emergency, you have to make an immediate visit to your DOCTOR.

Calculate the expected increase in your weight during pregnancy with the pregnancy weight gain calculator. It helps you plan a weekly weight schedule by considering your pre-pregnancy body mass index. With that, get to know how much weight you are likely to increase week by week in every trimester.

Let’s promote a healthy pregnancy journey! 

How Much Weight Should You Gain During Pregnancy?

It depends upon your BMI which is the minimum amount of calories your body needs to stay alive when you are at rest. However, our pregnancy weight calculator gives you a proper insight into how much increase in weight per week is considered good while you are carrying a baby.

If your goal comes up with manual tracking of weight, then you need to go through the following guide:

Managing Your Average Weight Gain During Pregnancy:

During pregnancy, most women experience an increase in weight of up to 35 pounds. While on the other hand, most increase their weight by a maximum of 4 pounds in the first trimester. After that, the weight increases at the balanced rate of 1 pound every week.

Weight Gain Recommendations:

The following pregnancy weight gain chart by week gives you an idea of normal weight gain during pregnancy journey:

If Carrying One Baby:

If Carrying Twins:
If before pregnancy, you were… You should gain…
Underweight BMI less than 18.5 28-40 pounds
Normal Weight BMI 18.5-24.9 25-35 pounds
Overweight BMI 25.0-29.9 15-25 pounds
Obese BMI greater than or equal to 30.0 11- 20 pounds
If before pregnancy, you were… You should gain…
Underweight BMI less than 18.5 50-62 pounds*
Normal Weight BMI 18.5-24.9 37-54 pounds
Overweight BMI 25.0-29.9 31-50 pounds
Obese BMI greater than or equal to 30.0 25-42 pounds

How To Use Our Pregnancy Weight Gain Calculator?

Our calculator functions to tell you how much weight gain during pregnancy is good for you. It needs you to provide a few information to estimate results. These include:

What To Do?

  • Enter your height and weight in their respective fields with units selected
  • Now enter the running pregnancy week
  • Select if you are carrying twins or not
  • Tap Calculate 

What You Get!

  • Minimum & maximum pregnancy weight gain by week
  • Detailed trimester weight gain stats

Pregnancy Weight Gain Table:

Gestational age Lengtd (US) Weight (US) Lengtd (cm) Mass (g)
  (head to bottom) (head to bottom)
8 weeks 0.62 inches 0.71 ounces 1.57 cm 20 grams
9 weeks 0.91 inches 0.95 ounces 2.30 cm 27 grams
10 weeks 1.22 inch 1.23 ounces 3.1 cm 35 grams
11 weeks 1.61 inch 1.59 ounces 4.1 cm 45 grams
12 weeks 2.13 inches 2.05 ounces 5.4 cm 58 grams
13 weeks 2.64 inches 2.58 ounces 6.7 cm 73 grams
  (head to toe) (head to toe)
14 weeks 5.79 inches 3.28 ounces 14.7cm 93 grams
15 weeks 6.57 inches 4.13 ounces 16.7 cm 117 grams
16 weeks 7.32 inches 5.15 ounces 18.6 cm 146 grams
17 weeks 8.03 inches 6.38 ounces 20.4 cm 181 grams
18 weeks 8.74 inches 7.87 ounces 22.2 cm 223 grams
19 weeks 9.45 inches 9.63 ounces 24.0 cm 273 grams
20 weeks 10.12 inches 11.68 ounces 25.7 cm 331 grams
21 weeks 10.79 inches 14.07 ounces 27.4 cm 399 grams
22 weeks 11.42 inches 1.05 pounds 29.0 cm 478 grams
23 weeks 12.05 inches 1.25 pounds 30.6 cm 568 grams
24 weeks 12.68 inches 1.48 pounds 32.2 cm 670 grams
25 weeks 13.27 inches 1.73 pounds 33.7 cm 785 grams
26 weeks 13.82 inches 2.01 pounds 35.1 cm 913 grams
27 weeks 14.41 inches 2.33 pounds 36.6 cm 1055 grams
28 weeks 14.80 inches 2.67 pounds 37.6 cm 1210 grams
29 weeks 15.47 inches 3.04 pounds 39.3 cm 1379 grams
30 weeks 15.95 inches 3.44 pounds 40.5 cm 1559 grams
31 weeks 16.46 inches 3.86 pounds 41.8 cm 1751 grams
32 weeks 16.93 inches 4.30 pounds 43.0 cm 1953 grams
33 weeks 17.36 inches 4.77 pounds 44.1 cm 2162 grams
34 weeks 17.84 inches 5.24 pounds 45.3 cm 2377 grams
35 weeks 18.23 inches 5.72 pounds 46.3 cm 2595 grams
36 weeks 18.62 inches 6.20 pounds 47.3 cm 2813 grams
37 weeks 19.02 inches 6.68 pounds 48.3 cm 3028 grams
38 weeks 19.41 inches 7.13 pounds 49.3 cm 3236 grams
39 weeks 19.72 inches 7.57 pounds 50.1 cm 3435 grams
40 weeks 20.08 inches 7.98 pounds 51.0 cm 3619 grams
41 weeks 20.39 inches 8.35 pounds 51.8 cm 3787 grams

Frequently Asked Questions

How Is Fetal Size Measured?

The size of the fetus is measured using either Ultrasound or Fundal Height Measurement.

Is It OK To Gain 20 kg During Pregnancy?

If you had a normal weight before pregnancy, then you should put on 11.5-15.8kg. If you were overweight, then put on 7-11.5kg.

How Many Kg Is OK To Gain During Pregnancy?

During pregnancy, most of the women gain 25 - 35 lbs of weight, which is normal.

Does a Fetus Double In Size Every Week?

Not at all! A fetus never doubles its size during every passing week of the pregnancy.