Calculators

Due Date Calculator

Estimate baby’s due date from last menstrual period (LMP) or conception date. Optional cycle-length adjustment, plus gestational age and trimester. Built by Tolyo.

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Inputs

Method

LMP (YYYY-MM-DD)

Adjust for cycle length

Naegele’s rule assumes 28-day cycles.

Cycle length (days)

EDD: Jun 10, 2026GA: 8w 0dFirst trimester

Results

Estimated Due Date (EDD)

Jun 10, 2026

Gestational age today

8w 0d

Counted from LMP

Trimester

First trimester

Time to due date

31w 6d

This tool is for educational estimation only and does not replace professional medical advice. Always confirm dates and care plans with your healthcare provider.

Notes

LMP method uses Naegele’s rule: EDD = LMP + 280 days, adjusted for cycle length.
Conception method: EDD = Conception + 266 days (≈ 38 weeks).
This tool provides estimates only and is not medical advice. Confirm with your clinician.