Gestational Age Calculator
Result
Gestational Age Calculator — free online calculator.
Formula
- Gestational Age Calculator adds elapsed days to a reference gestational age expressed in weeks and additional days, then converts the total back to weeks and days.
- The main inputs are Days since reference, Gestational weeks at reference, Extra days at reference. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Gestational Age
- Days since reference: 30
- Gestational weeks at reference: 12
- Extra days at reference: 0 0–6
With 0 elapsed days and a reference age of 0 weeks 0 days, the result is 0 weeks 0 days.
Sample result: Calculating…
Frequently asked questions
What does the Gestational Age calculate?
Gestational Age Calculator — free online calculator.
Which values should I enter?
Enter Days since reference, Gestational weeks at reference, Extra days at reference using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Total gestational days = Reference weeks × 7 + Reference days + Elapsed days.
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.