Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Pregnancy
Fetal Weight Estimator
Estimate your baby's approximate weight based on gestational age in weeks. Useful during prenatal checkups to track fetal growth milestones trimester by trimester.
Fill in the required fields to see your result.
Pregnancy
Due Date Calculator
Estimates your baby's due date by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP) using Naegele's Rule. Use it in early pregnancy to plan prenatal appointments, milestones, and parental leave.
Fill in the required fields to see your result.
Key differences
| Fetal Weight Estimator | Due Date Calculator | |
|---|---|---|
| Category | Pregnancy | Pregnancy |
| Inputs required | 1 | 1 |
| Result | Estimated fetal weight (grams) | Days until due date (days) |
| What it does | Estimate your baby's approximate weight based on gestational age in weeks. Useful during prenatal checkups to track fetal growth milestones trimester by trimester. | Estimates your baby's due date by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP) using Naegele's Rule. Use it in early pregnancy to plan prenatal appointments, milestones, and parental leave. |