Pregnancy Weight Gain Calculator

How to Use Pregnancy Weight Gain Calculator

1. Enter pre‑pregnancy measurements. Input your height in cm and weight in kg before pregnancy, then your current weight and week of pregnancy.
2. Toggle twins if applicable. Check the “Twins” box to switch to IOM twin‑specific weight gain ranges.
3. Click Calculate. The tool computes your pre‑pregnancy BMI and looks up the recommended total weight gain range according to IOM guidelines.
4. Review your status. You’ll see your expected gain by the current week, your actual gain, and whether you are below, within, or above the recommended range.

Benefits of Pregnancy Weight Gain Calculator

• Uses official IOM (Institute of Medicine) ranges personalised by BMI category and singleton/twin pregnancy.
• Shows a week‑by‑week expected gain, so you know if you are on track without having to wait until the end.
• Helps identify excessive or insufficient gain early, giving you time to discuss adjustments with your healthcare provider.
• Completely offline – your body metrics stay on your device and are never transmitted anywhere.

Frequently Asked Questions

What if my weight gain is below the recommended range?

A small deviation is not necessarily a problem, but consistently gaining too little can be associated with low birth weight. Discuss any concerns with your doctor or midwife.

How much should I gain in the first trimester?

Most IOM ranges suggest only 0.5–2 kg total in the first trimester. The calculator expects most gain to occur after week 13. If you have severe nausea, consult your doctor.

Does the calculator apply if I was overweight before pregnancy?

Yes, it uses separate gain ranges for overweight (BMI 25‑29.9) and obese (BMI ≥30) categories. These lower targets are designed to reduce risks for both mother and baby.

Is Pregnancy Weight Gain Calculator free and private?

Yes — it is 100% free, needs no sign‑up, and everything runs in your browser; your data never leaves your device.