Conception Date Calculator

Estimate your conception date based on due date or last period.

Calculation Method

Lmp

Cycle Length (days) (Days)

Cycle Length

Enter your details to estimate conception

This calculator estimates the date conception likely occurred based on your estimated due date or LMP.

Choose a method (Due Date or LMP) and enter the dates to find the probable conception window.

This calculator is based on statistical data. Consult your doctor for exact results.

Frequently Asked Questions

Conception usually happens about 266 days before the due date, or ~14 days after the start of your last period.