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Pregnancy weight gain calculator

Compare your total weight change with CDC pregnancy weight-gain ranges for your pre-pregnancy BMI.

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Compare your total weight change with CDC pregnancy weight-gain ranges for your pre-pregnancy BMI.

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
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Formula and assumptions
These are total-pregnancy reference ranges, not a target for your current week or instructions to change your diet. This lookup covers pre-pregnancy BMI below 40 and one baby or twins, matching the CDC table. For BMI 40 or above, triplets, swelling, rapid changes or individual concerns, discuss a personal range with your maternity clinician. Current weight does not change the reference range. No weekly gain curve is inferred.
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Using Pregnancy weight gain calculator
Compare your total weight change with CDC pregnancy weight-gain ranges for your pre-pregnancy BMI.
These are total-pregnancy reference ranges, not a target for your current week or instructions to change your diet. This lookup covers pre-pregnancy BMI below 40 and one baby or twins, matching the CDC table. For BMI 40 or above, triplets, swelling, rapid changes or individual concerns, discuss a personal range with your maternity clinician. Current weight does not change the reference range. No weekly gain curve is inferred.
Next: Calculate BMI
Next: Pregnancy calculator
A worked example
Someone 170 cm tall who weighed 65 kg before pregnancy (BMI 22.5) has a reference total gain of 25 to 35 lb for one baby.
Before you use the result
These are total-pregnancy reference ranges, not a target for your current week or instructions to change your diet. This lookup covers pre-pregnancy BMI below 40 and one baby or twins, matching the CDC table. For BMI 40 or above, triplets, swelling, rapid changes or individual concerns, discuss a personal range with your maternity clinician. Current weight does not change the reference range. No weekly gain curve is inferred.
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ToolOctopus. “Pregnancy weight gain calculator.” Updated 2026-10-03. https://tooloctopus.com/pregnancy-weight-gain-calculator.
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