Pregnancy Weight Gain Calculator
Recommended weight gain by pre-pregnancy BMI (IOM 2009).
These are estimates based on standard formulas, not medical advice.
Runs entirely in your browser. Nothing is sent anywhere.
How it works
- 1Enter your values.
- 2See the result update instantly as you type.
- 3Change any value to compare scenarios.
About this tool
Pregnancy Weight Gain Calculator: Recommended weight gain by pre-pregnancy BMI (IOM 2009). Type your numbers and the result is calculated instantly — no button to press, nothing to install. All math runs locally in your browser, so the values you enter are never sent anywhere.
Example
| Input | |
|---|---|
| Weight before pregnancy (kg) | 62 |
| Height (cm) | 168 |
| Current week of pregnancy | 20 |
| Twins | No |
| Result | |
| Recommended total gain | 11.5–16 kg |
| BMI before pregnancy | 22 (Normal weight) |
| Typical gain by this week | 2.9–5.5 kg |
| Weekly gain from week 14 | 0.35–0.5 kg |
How do I use the Pregnancy Weight Gain Calculator?
Enter your values. See the result update instantly as you type. Change any value to compare scenarios.
Is the Pregnancy Weight Gain Calculator free?
Yes. It is completely free with no sign-up, no usage limits and no watermark.
Is my data sent to a server?
No. Everything is calculated locally in your browser. Nothing you enter is uploaded, logged or stored.
Does it work on my phone?
Yes. It works in any modern browser on Android, iPhone, iPad, Windows, Mac and Linux — no app needed.