Pregnancy Weight Gain

About the Pregnancy Weight Gain

Gaining the right amount of weight during pregnancy supports a healthy baby and an easier recovery — but the recommended range depends on where you started. Guidance from bodies like the Institute of Medicine bases healthy pregnancy weight gain on your pre-pregnancy BMI.

This Pregnancy Weight Gain calculator shows the recommended range for you based on your pre-pregnancy BMI, so you have a sensible target to discuss with your midwife or doctor.

How to use the Pregnancy Weight Gain

1. Enter your pre-pregnancy height and weight.
2. The tool works out your pre-pregnancy BMI.
3. It applies the recommended weight-gain range.
4. See your suggested healthy gain range.

Key features of the Pregnancy Weight Gain

• Recommended pregnancy weight-gain range
• Based on pre-pregnancy BMI
• Follows recognised guidance
• A helpful target to discuss with your provider
• Private — calculated in your browser

How the Pregnancy Weight Gain works

This calculator applies standard, peer-reviewed formulas used by health professionals and public-health bodies worldwide. Depending on the metric, that includes the World Health Organization (WHO) classification, NHS and CDC guidance, the Mifflin-St Jeor equation for metabolic rate, and the U.S. Navy method for body composition. Inputs are converted between metric and imperial units using exact factors so results are consistent whichever system you use.

All calculations are performed in your browser, so the health information you enter is never sent anywhere.

Tips & best practices

• The healthy range differs by pre-pregnancy BMI — those starting at a lower BMI are advised to gain more, and vice versa.
• Ranges for twins or more are different, so this single-baby guide may not apply — check with your provider.
• Weight gain is only one part of a healthy pregnancy; your midwife or doctor will guide the fuller picture.

Standards & accuracy

Uses internationally recognised clinical formulas — WHO, NHS, CDC, the U.S. Navy method and Mifflin-St Jeor — for screening-grade estimates.

Important: these tools provide screening-grade estimates for general information and education only. They are not a medical diagnosis and do not replace professional advice. Always consult a qualified healthcare provider before making health decisions.

Who uses the Pregnancy Weight Gain?

• Understanding a healthy weight-gain range in pregnancy
• Planning around your pre-pregnancy BMI
• Preparing for an appointment discussion
• General pregnancy-health awareness

Privacy & security

The Pregnancy Weight Gain runs entirely inside your web browser. Your data — whether that is a file, figures or text — is processed on your own device and is never uploaded to a server, stored or shared. There is no signup and no account, so you can use it as often as you like while keeping full control of your information. This makes it a safe choice even for confidential and sensitive work.

Why choose Toolinza?

• 100% free — no hidden charges, watermarks or usage caps.
• Private & secure — your data stays on your device.
• Standards-compliant — accurate results suitable for the UK, USA, Canada, Australia, EU, India, Pakistan, the Middle East and worldwide.
• Works everywhere — desktop, tablet and mobile.

Frequently asked questions