Enter your current pregnancy week, height, pre pregnancy weight, current weight, and whether you are expecting twins to get a personalized maternity weight gain guideline.
The maternity weight gain calculator helps you understand healthy weight changes during pregnancy based on your BMI and weekly progression. It provides an insight summary and a full 40 week reference table so you can track your progress clearly.
How to Use Maternity Weight Gain Calculator
Choose your pregnancy week, select if you are carrying twins, and enter your height along with your pre pregnancy and current weight. The maternity weight gain calculator reviews these inputs and compares them with standard recommendations for your BMI category.
What You get in Result
- Insight summary based on your current progress
- BMI category
- Recommended total pregnancy weight gain range
- Weekly reference table covering all 40 weeks in both kilograms and pounds
Example Input
| Field | Value |
|---|---|
| Pregnancy Week | 1 |
| Pregnant with Twins | No |
| Height | 165 cm |
| Pre Pregnancy Weight | 50 kg |
| Current Weight | 55 kg |
Maternity Weight Gain Summary
| Item | Value |
|---|---|
| Your BMI Before Maternity | 18.4 kg/m² (Underweight) |
| Recommended Weight Range (Week 1) | 50.0 – 50.2 kg / 110.3 – 110.6 lb |
| Your Current Weight | 55.0 kg (121.3 lb) — 4.8 kg above the upper range |
| Recommended Weight Range (Week 40) | 62.5 – 68.0 kg / 137.8 – 149.9 lb |
| Recommended Total Gain (Week 40) | 12.5 – 18.0 kg / 27.6 – 39.7 lb |
Note: These results are informational. Please consult your maternity doctor or healthcare provider for personalized guidance.
Weekly Recommended Weight Range
| Week | Recommended Weight Range (kg / lb) | Recommended Weight Gain (kg / lb) |
|---|---|---|
| 1 | 50.0 – 50.2 kg / 110.3 – 110.6 lb | 0.0 – 0.2 kg / 0.1 – 0.3 lb |
| 2 | 50.1 – 50.3 kg / 110.4 – 110.9 lb | 0.1 – 0.3 kg / 0.2 – 0.7 lb |
| 3 | 50.1 – 50.5 kg / 110.5 – 111.2 lb | 0.1 – 0.5 kg / 0.3 – 1.0 lb |
| 4 | 50.2 – 50.6 kg / 110.6 – 111.6 lb | 0.2 – 0.6 kg / 0.3 – 1.4 lb |
| 5 | 50.2 – 50.8 kg / 110.7 – 111.9 lb | 0.2 – 0.8 kg / 0.4 – 1.7 lb |
| 6 | 50.2 – 50.9 kg / 110.7 – 112.3 lb | 0.2 – 0.9 kg / 0.5 – 2.0 lb |
| 7 | 50.3 – 51.1 kg / 110.8 – 112.6 lb | 0.3 – 1.1 kg / 0.6 – 2.4 lb |
| 8 | 50.3 – 51.2 kg / 110.9 – 112.9 lb | 0.3 – 1.2 kg / 0.7 – 2.7 lb |
| 9 | 50.3 – 51.4 kg / 111.0 – 113.3 lb | 0.3 – 1.4 kg / 0.8 – 3.1 lb |
| 10 | 50.4 – 51.5 kg / 111.1 – 113.6 lb | 0.4 – 1.5 kg / 0.8 – 3.4 lb |
| 11 | 50.4 – 51.7 kg / 111.2 – 114.0 lb | 0.4 – 1.7 kg / 0.9 – 3.7 lb |
| 12 | 50.5 – 51.8 kg / 111.2 – 114.3 lb | 0.5 – 1.8 kg / 1.0 – 4.1 lb |
| 13 | 50.5 – 52.0 kg / 111.3 – 114.6 lb | 0.5 – 2.0 kg / 1.1 – 4.4 lb |
| 14 | 50.9 – 52.6 kg / 112.3 – 115.9 lb | 0.9 – 2.6 kg / 2.1 – 5.7 lb |
| 15 | 51.4 – 53.2 kg / 113.3 – 117.3 lb | 1.4 – 3.2 kg / 3.1 – 7.0 lb |
| 16 | 51.8 – 53.8 kg / 114.3 – 118.6 lb | 1.8 – 3.8 kg / 4.0 – 8.3 lb |
| 17 | 52.3 – 54.4 kg / 115.3 – 119.9 lb | 2.3 – 4.4 kg / 5.0 – 9.6 lb |
| 18 | 52.7 – 55.0 kg / 116.2 – 121.2 lb | 2.7 – 5.0 kg / 6.0 – 10.9 lb |
| 19 | 53.2 – 55.6 kg / 117.2 – 122.5 lb | 3.2 – 5.6 kg / 7.0 – 12.2 lb |
| 20 | 53.6 – 56.1 kg / 118.2 – 123.8 lb | 3.6 – 6.1 kg / 8.0 – 13.6 lb |
| 21 | 54.1 – 56.7 kg / 119.2 – 125.1 lb | 4.1 – 6.7 kg / 8.9 – 14.9 lb |
| 22 | 54.5 – 57.3 kg / 120.2 – 126.4 lb | 4.5 – 7.3 kg / 9.9 – 16.2 lb |
| 23 | 54.9 – 57.9 kg / 121.1 – 127.7 lb | 4.9 – 7.9 kg / 10.9 – 17.5 lb |
| 24 | 55.4 – 58.5 kg / 122.1 – 129.0 lb | 5.4 – 8.5 kg / 11.9 – 18.8 lb |
| 25 | 55.8 – 59.1 kg / 123.1 – 130.3 lb | 5.8 – 9.1 kg / 12.9 – 20.1 lb |
| 26 | 56.3 – 59.7 kg / 124.1 – 131.6 lb | 6.3 – 9.7 kg / 13.8 – 21.4 lb |
| 27 | 56.7 – 60.3 kg / 125.1 – 132.9 lb | 6.7 – 10.3 kg / 14.8 – 22.7 lb |
| 28 | 57.2 – 60.9 kg / 126.0 – 134.2 lb | 7.2 – 10.9 kg / 15.8 – 24.0 lb |
| 29 | 57.6 – 61.5 kg / 127.0 – 135.5 lb | 7.6 – 11.5 kg / 16.8 – 25.3 lb |
| 30 | 58.1 – 62.1 kg / 128.0 – 136.8 lb | 8.1 – 12.1 kg / 17.8 – 26.6 lb |
| 31 | 58.5 – 62.7 kg / 129.0 – 138.2 lb | 8.5 – 12.7 kg / 18.7 – 27.9 lb |
| 32 | 58.9 – 63.3 kg / 130.0 – 139.5 lb | 8.9 – 13.3 kg / 19.7 – 29.2 lb |
| 33 | 59.4 – 63.9 kg / 130.9 – 140.8 lb | 9.4 – 13.9 kg / 20.7 – 30.5 lb |
| 34 | 59.8 – 64.4 kg / 131.9 – 142.1 lb | 9.8 – 14.4 kg / 21.7 – 31.8 lb |
| 35 | 60.3 – 65.0 kg / 132.9 – 143.4 lb | 10.3 – 15.0 kg / 22.7 – 33.2 lb |
| 36 | 60.7 – 65.6 kg / 133.9 – 144.7 lb | 10.7 – 15.6 kg / 23.6 – 34.5 lb |
| 37 | 61.2 – 66.2 kg / 134.8 – 146.0 lb | 11.2 – 16.2 kg / 24.6 – 35.8 lb |
| 38 | 61.6 – 66.8 kg / 135.8 – 147.3 lb | 11.6 – 16.8 kg / 25.6 – 37.1 lb |
| 39 | 62.1 – 67.4 kg / 136.8 – 148.6 lb | 12.1 – 17.4 kg / 26.6 – 38.4 lb |
| 40 | 62.5 – 68.0 kg / 137.8 – 149.9 lb | 12.5 – 18.0 kg / 27.6 – 39.7 lb |
Understanding the Results
Healthy weight gain varies with BMI and whether it is a single or twin pregnancy. The maternity weight gain calculator helps you see if your progress aligns with typical guidelines so you can stay informed throughout your pregnancy journey.
Common Questions
Is the maternity weight gain calculator suitable for all pregnancy stages?
Yes, it provides guidance for every week from week 1 to week 40.
Why does BMI matter?
BMI helps determine the most suitable weight gain range for your body type.
Does twin pregnancy affect recommended weight gain?
Yes, carrying twins typically increases the suggested total weight gain, and the calculator adjusts for this automatically.