Formula
Add 280 days to the first day of the last menstrual period, adjusted by the difference between the cycle length and 28 days.
Health & Body · Tool 618 of 200,000
Due Date Calculator
Enter your values for a transparent, reproducible due date calculator, with the formula and scope shown.
LiveScenario estimateLocal calculationUS · USD
Your inputs
Enter real numbers
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Live result
Estimated due date
February 4, 2027
This result updates automatically when you change an input.
- Last menstrual period
- April 30, 2026
- Estimated gestational age
- 280 days
- Time remaining
- 178 days
Reproducible, not guessed
How was this calculated?
Scope
Use values that match your situation and location. Verify rule-based, contractual, financial or health decisions against an authoritative local source.
Model context
localeen-UScountryUScurrencyUSDtimezoneAmerica/New_Yorkunit_systemimperialrules_versionus-2026.08source_languageen-US
Results are for first-pass estimates and scenario comparison. Important tax, employment, health and investment decisions should be verified against local official guidance or a qualified professional.