Estimate healthy gain using prepregnancy BMI and gestational week. Check progress for singletons or twins. Use results to discuss goals with your care team.
| Case | Pregnancy | Pre-weight | Height | Week | Current weight | BMI | Current target gain | Status |
|---|---|---|---|---|---|---|---|---|
| A | Singleton | 60.0 kg | 165 cm | 20 | 64.5 kg | 22.0 | 3.95 to 5.53 kg | Within |
| B | Singleton | 78.0 kg | 165 cm | 28 | 82.0 kg | 28.7 | 4.14 to 6.90 kg | Below |
| C | Twins | 58.0 kg | 160 cm | 24 | 67.0 kg | 22.7 | 8.51 to 12.42 kg | Within |
| D | Singleton | 48.0 kg | 165 cm | 34 | 59.5 kg | 17.6 | 10.22 to 14.59 kg | Within |
1) Pre-pregnancy BMI
BMI = weight (kg) ÷ height² (m²)
BMI = weight (lb) × 703 ÷ height² (in²)
2) Recommended total gain range
The calculator picks a target range from the pregnancy type and BMI category.
3) Current-week target range
Current target gain = total recommended gain × progress fraction
4) Progress fraction
Weeks 0–13 receive 12% of the total planned gain.
The remaining 88% is spread evenly to week 40 for one baby or week 38 for twins.
5) Actual gain
Actual gain = current weight − pre-pregnancy weight
6) Status logic
Below target: actual gain is less than current target minimum.
Within target: actual gain sits inside the current target band.
Above target: actual gain is higher than current target maximum.
It estimates prepregnancy BMI, recommended total pregnancy weight gain, a current-week target gain band, and whether your entered gain is below, within, or above that band.
Yes. Choose the twins option. The calculator switches to twin total-gain ranges and uses a week 38 tracking endpoint for the progress chart.
No. It is a tracking and planning tool. Your clinician may set different goals based on symptoms, growth scans, blood pressure, diabetes, nausea, or other pregnancy factors.
Pre-pregnancy weight is used to estimate the starting BMI category. That category determines which total-gain range the calculator applies during the pregnancy.
This page uses a smooth tracking curve to spread gain across pregnancy weeks. Some clinics use different charts, population curves, or individual goals.
One data point does not tell the whole story. Review food intake, hydration, swelling, and symptoms, then speak with your prenatal care team for personalized guidance.
Yes. The calculator accepts metric and imperial entries. It also shows results using the same unit system you selected for the form.
They export the result summary, including pregnancy type, week, BMI, category, actual gain, current target gain, total recommended gain, and status.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.