Conception Date Calculator

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

Input Parameters

Method

Due Date

Estimated Timing

Conception DateOctober 25, 2025

WindowOct 20, 2025 - Oct 25, 2025Fertility Range

Conception is estimated to have occurred around October 25, 2025.

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

Overview

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

Fun Facts

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

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