CalculatorHealth

Pregnancy Due Date Calculator

Estimate a pregnancy due date from the first day of the last menstrual period or a known conception date.

Instant · no account

Input

Enter your values

Calculation method

Date

Average cycle lengthdays

Method

How it works

Change any input above and the result updates instantly. The formula or method used by this tool is shown below.

LMP method: due date ≈ LMP + 280 days, adjusted for cycle length; conception method: conception + 266 days

Note

Health results are general informational estimates and are not a diagnosis or medical advice.

Keep going

Related tools

Explore more tools from Health and similar workflows.

BMI Calculator→BMR Calculator→Body Surface Area Calculator→Calorie Deficit Calculator→FFMI Calculator→Ideal Weight Estimate→Macro Calculator→Running Pace Calculator→

Quick answers

About this tool

What does the Pregnancy Due Date Calculator do?+

Estimate a pregnancy due date from the first day of the last menstrual period or a known conception date.

How does this calculator calculate the result?+

It uses this method: LMP method: due date ≈ LMP + 280 days, adjusted for cycle length; conception method: conception + 266 days

Are my inputs saved or sent to an account?+

Core CalcForge tools require no account, and most calculations run locally in your browser. Favorites and recent-tool history, when used, stay in this browser.