Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Pregnancy
Gestational Age Calculator
Converts the number of days since your last menstrual period into gestational age expressed as weeks and days. Use it at any point in pregnancy to know your exact stage for prenatal care, screenings, and milestone tracking.
Fill in the required fields to see your result.
Pregnancy
Baby Size Calculator
Estimates fetal weight and size using gestational age alone or ultrasound measurements (BPD, FL, AC). Used by parents and clinicians to track growth against standard developmental charts.
Fill in the required fields to see your result.
Key differences
| Gestational Age Calculator | Baby Size Calculator | |
|---|---|---|
| Category | Pregnancy | Pregnancy |
| Inputs required | 1 | 5 |
| Result | Gestational age (weeks) | Estimated Baby Weight (grams) |
| What it does | Converts the number of days since your last menstrual period into gestational age expressed as weeks and days. Use it at any point in pregnancy to know your exact stage for prenatal care, screenings, and milestone tracking. | Estimates fetal weight and size using gestational age alone or ultrasound measurements (BPD, FL, AC). Used by parents and clinicians to track growth against standard developmental charts. |