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Pregnancy Weight Gain Calculator

Estimate pregnancy weight gain from your current pregnancy stage, pregnant with twins, your weight before pregnancy with the Pregnancy Weight Gain Calculator.

PREGNANCY WEIGHT GAIN7 kg

Estimated gain by week 20; individual recommendations vary. Discuss weight changes with a prenatal clinician. Educational estimate only; not medical advice.

Prepregnancy BMI
23.9
Recommended gain by this week
about 4.4 kg
Difference from midpoint
2.6 kg
Estimate based on the values shown
MethodCompares current gain with week-specific ranges based on prepregnancy BMI and singleton or twin pregnancy.

Before you use the result

Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional.

CALCULATOR GUIDE

How to use the Pregnancy Weight Gain Calculator

Estimate pregnancy weight gain from your current pregnancy stage, pregnant with twins, your weight before pregnancy with the Pregnancy Weight Gain Calculator. Use it to understand an educational estimate and the inputs behind it, not as a diagnosis or treatment decision.

Step by step

  1. For the Pregnancy Weight Gain, enter your current pregnancy stage, pregnant with twins, your weight before pregnancy, your weight now, your height. Keep each value in the unit displayed beside its field.
  2. Review the selected Pregnancy Weight Gain workflow and inputs, then read pregnancy weight gain in the result panel.
  3. Change one Pregnancy Weight Gain assumption at a time to compare scenarios. Use Reset to restore this tool's worked example values.

How the calculation works

Compares current gain with week-specific ranges based on prepregnancy BMI and singleton or twin pregnancy.

Worked example

In the Pregnancy Weight Gain worked example, your current pregnancy stage 20 weeks, pregnant with twins No, your weight before pregnancy 65 kg, your weight now 72 kg produces pregnancy weight gain of 7.00 kg. Estimated gain by week 20. Review the displayed units before comparing the result.

Understanding the result

The Pregnancy Weight Gain reports pregnancy weight gain. Use it to understand an educational estimate and the inputs behind it, not as a diagnosis or treatment decision. Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional.

How to check the answer

Check the Pregnancy Weight Gain estimate by confirming the units and supported ranges for your current pregnancy stage, pregnant with twins, your weight before pregnancy. Compare pregnancy weight gain with another published method or direct measurement when available, and ask a clinician before using it for a health decision.

Common questions

What does the Pregnancy Weight Gain calculate?

Estimate pregnancy weight gain from your current pregnancy stage, pregnant with twins, your weight before pregnancy with the Pregnancy Weight Gain Calculator.

Which Pregnancy Weight Gain inputs have the biggest effect?

pregnancy weight gain responds directly to your current pregnancy stage, pregnant with twins, your weight before pregnancy, your weight now, your height. Change one input while holding the others constant to see its effect.

Is the Pregnancy Weight Gain result exact?

Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional. Recheck your current pregnancy stage, pregnant with twins, your weight before pregnancy and use pregnancy weight gain only for a decision where that level of precision is appropriate.

Formula tests, limits, sources, and guide registry updated September 1, 2026.
INTERPRET THE RESULTRead the health guideCheck assumptions, limitations and comparison methods →