Pregnancy Due Date Calculator
Result
Calculated result
282
Based on the values entered.
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Pregnancy Due Date Calculator — free online calculator.
Formula
Due date = LMP + 280 days, adjusted by (cycle length − 28) days (Naegele's rule)
- Pregnancy Due Date Calculator calculates its result from Lmp. It uses the formula Due date = LMP + 280 days, adjusted by (cycle length − 28) days (Naegele's rule). Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Lmp. 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: Pregnancy Due Date
Inputs
- Lmp: 2
Using Lmp = 2, the calculated result is 282.
Sample result: Calculating…
Frequently asked questions
What does the Pregnancy Due Date calculate?
Pregnancy Due Date Calculator — free online calculator.
Which values should I enter?
Enter Lmp using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Due date = LMP + 280 days, adjusted by (cycle length − 28) days (Naegele's rule).
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.