Pregnancy Weight Gain Calculator
Recommended gain by BMI and week.
Enter your values
Enter the pre-pregnancy weight in kg.
Enter the height in cm.
Enter the current week you are working with.
Enter the current weight in kg.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Recommended total gain
- 11.5–16 kg
- Pre-pregnancy BMI
- 23.1
- Expected gain by week 24
- 5.3–7.7 kg
- Gained so far
- 7 kg
- Status
- On track
Quick answer
Recommended gain depends on pre-pregnancy BMI: 25–35 lb for normal weight, less if overweight.
At a glance
| What it does | Recommended gain by BMI and week. |
|---|---|
| Category | Health |
| Inputs needed | Pre-pregnancy weight, Height, Current week, Current weight |
| Main output | Recommended total gain |
| Cost | Free — no sign-up, no download |
How to use the Pregnancy Weight Gain Calculator
- 1Enter your pre-pregnancy weight and height.
- 2Enter your current week of pregnancy.
- 3Enter your current weight.
Inputs explained
- Pre-pregnancy weight(kg)
- Enter the pre-pregnancy weight in kg.
- Height(cm)
- Enter the height in cm.
- Current week
- Enter the current week you are working with.
- Current weight(kg)
- Enter the current weight in kg.
Worked example
Using the values the calculator loads with:
Inputs
- Pre-pregnancy weight63 kg
- Height165 cm
- Current week24
- Current weight70 kg
Results
- Recommended total gain11.5–16 kg
- Pre-pregnancy BMI23.1
- Expected gain by week 245.3–7.7 kg
- Gained so far7 kg
- StatusOn track
Frequently asked questions
Do twins change this?
Yes — recommended gain is roughly 17–25 kg for twins at normal BMI.
Is gaining slowly a problem?
Discuss any consistent deviation with your midwife or doctor.
What do I need to enter into the Pregnancy Weight Gain Calculator?
Just 4 values: pre-pregnancy weight, height, current week, current weight. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Pregnancy Weight Gain Calculator work out the answer?
Recommended gain depends on pre-pregnancy BMI: 25–35 lb for normal weight, less if overweight. The working is shown step by step so you can verify the result by hand.
Is the Pregnancy Weight Gain Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.