Pregnancy Weight Gain Calculator
Recommended gain based on pre-pregnancy BMI: underweight=12.5-18kg, normal=11.5-16kg, overweight=7-11.5kg, obese=5-9kgBMI=22.5 (normal); expected total gain 11.5-16kg; at week 20, ~5.75-8kg gained
Free online tool
Pregnancy Weight Gain Calculator
Enter your pre-pregnancy weight, height and current pregnancy week.
Instant calculation
Pregnancy Weight Gain Calculator
Enter your pre-pregnancy weight, height and current pregnancy week.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter pre-pregnancy weight
Type your weight before pregnancy in kilograms.
- 02
Enter height
Type your height in centimeters.
- 03
Enter current week
Type your current pregnancy week.
The formula
How this calculation works
Guidelines from the Institute of Medicine. Total gain is spread across the full 40-week pregnancy.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
Pre-pregnancy 65 kg, 170 cm, week 20 — expected gain?
BMI=22.5 (normal); expected total gain 11.5-16kg; at week 20, ~5.75-8kg gainedTotal: 11.5-16 kg; at week 20: ~5.75-8 kgCommon questions
Questions about this calculation
What is the Pregnancy Weight Gain Calculator?
The Pregnancy Weight Gain Calculator helps you estimate recommended weight gain during pregnancy based on pre-pregnancy BMI. Enter your values and select Calculate to get an instant result.
How is the result calculated?
Guidelines from the Institute of Medicine. Total gain is spread across the full 40-week pregnancy.
Can you show an example?
Example: Pre-pregnancy 65 kg, 170 cm, week 20 — expected gain? — Total: 11.5-16 kg; at week 20: ~5.75-8 kg.
Is my data saved when I use the Pregnancy Weight Gain Calculator?
No. All calculations run locally in your browser. Your inputs and results are never uploaded, stored or shared with anyone.
Is the Pregnancy Weight Gain Calculator free to use?
Yes. The Pregnancy Weight Gain Calculator is completely free. No account, sign-up or payment is required. It works on mobile, tablet and desktop.
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