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Saylor Innovations Pregnancy Due Date Calculator
x402
Saylor Innovations Pregnancy Due Date Calculator is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).
Calculates pregnancy due date using Naegele's rule from last menstrual period, along with gestational age, trimester, and key milestone dates
Price / call$0.01
Success—
StatusUnknown
How this service works
Pregnancy due date by Naegele's rule from last period or conception with cycle adjustment, gestational age today, trimester and key milestone dates
Output
Returns the estimated due date (YYYY-MM-DD), conception estimate, gestational age in weeks and days with a text description, current trimester number, percentage of pregnancy complete, days until due date, cycle adjustment days applied, and an array of key pregnancy milestones each with gestational week, date, and a description of what typically happens at that stage. Also includes a source attribution and contextual note.
Example use cases
First-trimester due date check
“I just found out I'm pregnant! My last menstrual period started on February 3rd 2025 — can you figure out my due date using Naegele's rule, tell me how many weeks along I am, and show me the important milestone dates?”
Gestational age progress tracking
“My LMP was November 10th 2024. What trimester am I in now, how far along am I in weeks and days, and what percentage of the pregnancy is complete?”
Conception date estimation
“Can you work out when I likely conceived? My last period started on January 20th 2025 and I have a 32-day cycle, so please adjust for that when calculating my due date and conception window.”
Technical details
Endpoint
GEThttps://saylorinnovations.com/api/health/due-date?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, rules-based obstetric due date calculation (Naegele's rule) with cycle-length adjustment, gestational age breakdown, trimester identification, and structured milestone dates — all in one call. Prefer it over building custom date arithmetic when you need clinically-grounded pregnancy timeline data without integrating a full EHR system.
Side effects
- Missing required lmp parameter returns an error
- Malformed date format for lmp or today causes a parsing error
- Future LMP date or LMP more than ~42 weeks ago may produce out-of-range or clinically implausible results
- Invalid query parameter types may return a 400 error
- Service unavailability or x402 payment failure returns a non-200 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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