Pregnancy Weight Gain Calculator: The Complete Guide
See how much weight gain is recommended during pregnancy. Enter your pre-pregnancy weight and height to get your BMI and the recommended total gain range for a single-baby pregnancy.
Who the Pregnancy Weight Gain Calculator is for
Expectant parents who want evidence-based weight-gain targets for their starting BMI.
How to use the Pregnancy Weight Gain Calculator
- Type your values into the fields above — pick your currency or units where the calculator offers them.
- Results update automatically as you type; there's no submit button and nothing is sent to a server.
- Adjust any input to compare scenarios, then copy the result with a single click.
How it works
Recommendations follow Institute of Medicine guidelines by pre-pregnancy BMI: underweight 12.5–18 kg, normal 11.5–16 kg, overweight 7–11.5 kg, and obese 5–9 kg for a single baby.
Features
- Pre-pregnancy BMI
- Recommended gain range
- IOM guidelines
- Metric or imperial
Healthy weight gain in pregnancy
Recommended pregnancy weight gain depends on your weight before pregnancy: people who start at a lower BMI are advised to gain more, and those who start higher, less. These Institute of Medicine ranges are for a single baby; twins need more. Your provider will personalise the target to your health and pregnancy.