Pregnancy Due Date Calculator
Estimate a pregnancy due date using Naegele’s rule (LMP + 280 days), a known conception date, or an IVF embryo transfer date — plus current gestational age, trimester, and the start of each trimester. For informational use only, not medical advice.
Authorizations
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Body
Calculation Method
lmp, conception, ivf First Day of Last Period
Cycle Length (days)
20 <= x <= 45Conception Date
Embryo Transfer Date
Embryo Age at Transfer
3, 5 As of Date
Response
Tool output
The tool's slug, echoing the {slug} in the request path.
Output-contract version for this tool.
Credits this call consumed, after any settlement refund. 0 when metering is disabled.
Credits left in the current monthly allowance, or null when metering is disabled.
Correlation id, also sent as x-request-id.