Pregnancy Tools

Pregnancy Weight Gain Calculator

Estimate recommended pregnancy weight gain based on pre-pregnancy BMI, pregnancy week, and singleton vs twin pregnancy.

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Unit system

Use metric (kg/cm) or imperial (lb/ft+in). Results show both units.

Inputs

Pre-pregnancy measurements and current week.

Pregnancy type

Pre-pregnancy weight (lb) i

Height

Example: 5 ft 6 in

Current pregnancy week i

How it works

This tool calculates pre-pregnancy BMI, then uses BMI-category guidelines to estimate total gain and week-by-week targets.

Current weight (optional)

Add current weight to compare your gain vs the recommended range by week.

Current weight (lb)

Chart

When current weight is entered, the bar shows your gain vs the expected range for this week.

Reset

Estimates only. Clinical advice may differ based on health factors.

Results

Recommended total gain

Calculate recommended range

Enter pre-pregnancy weight, height, pregnancy type, and week to see recommendations.

Pre-pregnancy BMI

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Week target (this week)

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Expected cumulative gain by week —

Weekly gain (2nd+3rd tri)

—

After week 13 (configurable)

1st trimester estimate

—

Total by ~13 weeks (estimate)

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How pregnancy weight gain is calculated

This calculator estimates pre-pregnancy BMI from your pre-pregnancy weight and height, then looks up recommended total weight gain ranges. It also estimates expected gain by your current week using a simple model: a first-trimester estimate plus weekly gain targets for the second and third trimesters.

Why pre-pregnancy BMI matters

Recommended weight gain depends on your starting BMI. People with lower BMI generally have higher recommended total gain ranges, while higher BMI categories typically have lower recommended ranges.

Recommended pregnancy weight gain by BMI

Recommendations also differ for one baby vs twins. Use the pregnancy type selector to view the appropriate guidance.

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Frequently Asked Questions

Quick answers about pregnancy weight gain recommendations.

How much weight should I gain during pregnancy?

It depends on your pre-pregnancy BMI and whether you’re carrying one baby or twins. This calculator shows common recommended ranges.

Does recommended pregnancy weight gain depend on BMI?

Yes. Recommendations are based on BMI categories such as underweight, normal weight, overweight, and obesity.

How much weight should I gain if I am pregnant with twins?

Twin pregnancies typically have higher recommended total gain ranges. Select “Twins” to see the guidance.

What is normal weight gain by week in pregnancy?

After the first trimester, many guidelines use a weekly gain range during the second and third trimesters. This tool estimates week-based targets.

Is this pregnancy weight gain calculator accurate?

It provides estimates only. Individual recommendations can differ based on health factors—follow your healthcare provider’s guidance.

Disclaimer

This calculator is for informational purposes only and does not provide medical advice. For personalized recommendations, consult a qualified healthcare professional.