Due Date
Estimate a due date from LMP, conception, or ultrasound, with ACOG redating rules.
| Endpoint | https://due-date.gumballtools.com/api/mcp (streamable-http) |
|---|---|
| Registry version | 0.1.0 |
| Now | 1 tools · grade D (54) · pin ts_f7252cc014bd9faa7fcabbfdee270c3c · protocol 2025-06-18 |
| First / last listed | 2026-10-30 02:03 UTC / 2026-10-30 02:03 UTC |
| Grade over time | 2026-10-30: D (54), 1 tools |
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Tools: due_date
due_date | Estimate a due date and gestational age from a last menstrual period, a known conception date, an IVF transfer date, or an ultrasound measurement.
Use this for any pregnancy-dating question rather than doing the arithmetic. Three reasons, and they are all things models get wrong:
1. THE OFF-BY-TWO-WEEKS ERROR. Gestational age is counted from the first day of the LAST MENSTRUAL PERIOD, not from c params: method*, date*, cycleLength, scanWeeks, scanDays, lmp, asOf |
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