Conception Date Calculator

Estimate conception date from due date or LMP. Pregnancy dating.

Input Parameters

Method

Due Date

Estimated Timing

Conception DateDecember 7, 2025

WindowDec 2, 2025 - Dec 7, 2025Fertility Range

Conception is estimated to have occurred around December 7, 2025.

Disclaimer: This tool is for informational purposes only and is not a substitute for professional medical advice.

About this calculator

Overview

Conception ≈ Due date − 266 days. Or LMP + 14.

Fun Facts

Formula: Conception ≈ Due date − 266 days. Or LMP + 14 days.