Pregnancy Weight Gain Calculator – Track Your Range
See recommended weight gain ranges for pregnancy based on your starting BMI.
About the Pregnancy Weight Gain Calculator
What is the Pregnancy Weight Gain Calculator?
A pregnancy weight gain calculator shows recommended weight gain for your pregnancy based on your pre-pregnancy BMI.
Why use this calculator?
Gaining in the recommended band supports healthy fetal growth and makes post-birth recovery easier. The ranges come from medical guidelines such as the IOM/ACOG.
How to use it
- Enter your pre-pregnancy BMI.
- Enter how many weeks pregnant you are and gain so far.
- Read your total target range and whether you are on track.
Formula
Ranges by BMI category as defined by the Institute of Medicine.
Twin pregnancy, very young mothers and some conditions need individualized medical numbers.
Frequently Asked Questions
What if I started overweight?
The recommended total is smaller (about 5–9 kg). Your doctor can confirm what is right for your pregnancy.
Is it okay to lose weight while pregnant?
Only under medical supervision. In some obese pregnancies a very small gain is recommended, but never a diet without guidance.
Is this a medical diagnosis?
No. This tool provides general wellness information only. It is not a substitute for evaluation by a qualified healthcare professional.
Why do results differ from my doctor's measurements?
Clinical measurements use calibrated equipment and professional technique. Home estimates rely on formulas and self-reported values, so small differences are normal.
How often should I recalculate?
Recheck after meaningful changes such as weight gain or loss, a new workout routine, or every few months to track trends over time.
Do these formulas apply to everyone?
Most population formulas are less accurate for athletes, pregnant people, very young children and the elderly. Use them as a general guide.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.