Your gain vs. the on-track range
The green band is the recommended gain for your current week. The pointer is your gain so far.
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Pregnancy
Pregnancy Weight Gain Calculator
Find your recommended total pregnancy weight gain and the on-track range for your current week, based on your pre-pregnancy BMI and the IOM guidelines.
Recommended total gain
11–16 kg
Normal weight (BMI 18.5–24.9)
Pre-pregnancy BMI—
On-track by week 24—
Your gain so far—
How it works
The Institute of Medicine (IOM) recommends a total pregnancy weight-gain range based on your pre-pregnancy BMI. Most of the gain happens in the second and third trimesters at a fairly steady weekly rate, after a small first-trimester gain of around 0.5–2 kg (1–4 lb).
Recommended total gain (single baby)
| Pre-pregnancy BMI | Total gain |
|---|---|
| Underweight (<18.5) | 12.5–18 kg (28–40 lb) |
| Normal (18.5–24.9) | 11.5–16 kg (25–35 lb) |
| Overweight (25–29.9) | 7–11.5 kg (15–25 lb) |
| Obese (30+) | 5–9 kg (11–20 lb) |
Frequently asked questions
Is it bad to be outside the range?
Gaining a little more or less than the guideline is common. Persistent large deviations are worth discussing with your provider, who can factor in your individual situation.
Does carrying twins change the target?
Yes — recommended gain is higher for multiples. This calculator uses single-baby guidelines, so add extra if you are expecting twins, per your provider's advice.