Pregnancy Weight Gain Calculator

See the recommended weight gain during pregnancy from your pre-pregnancy BMI, based on Institute of Medicine guidance.

Quick answer: Pregnancy Weight Gain Calculator: See the recommended weight gain during pregnancy from your pre-pregnancy BMI, based on Institute of Medicine guidance. Everything runs in your browser, so nothing you enter is uploaded or stored.

Pre-pregnancy weight (lb)

Height (inches)

How to use Pregnancy Weight Gain Calculator

Enter your values in the fields.
The results update instantly as you type.
Note or copy the numbers you need.

Features

Instant results
Free, no signup
Runs in your browser, nothing is uploaded
Works on phone and desktop

How it works

BMI = weight in pounds / height in inches squared x 703. The recommended range comes from the Institute of Medicine categories for a single baby.

Worked example

At 150 lb and 65 inches, BMI is 25.0, in the normal category, so the range is 25 to 35 lb.

Good to know

Twins and other cases have different ranges. Ask your doctor.

Frequently asked questions

How much weight should I gain?

About 25 to 35 pounds for a normal pre-pregnancy BMI with one baby. The range is higher for underweight and lower for overweight.

Is this medical advice?

No. Your doctor sets a plan that fits your health.

Is the Pregnancy Weight Gain Calculator free?

Yes. It is free, needs no signup and works on any device.