Pregnancy Due Date Calculator
Estimate your due date and how far along you are, from your last period.
Your Dates
Your Estimate
Estimated Due Date
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How far along—
Trimester—
Estimated conception—
Frequently Asked Questions
The common method (Naegele\u2019s rule) adds 280 days (40 weeks) to the first day of your last period. We adjust for your cycle length if it differs from 28 days.
It is an estimate — only about 4% of babies arrive on the exact due date. A dating scan gives a more accurate figure.
No. Like every KwikSum tool, the calculation runs entirely in your browser and nothing is sent anywhere.
Working Out Your Due Date
Pregnancy is counted from the first day of your last menstrual period (LMP), not from conception, which is usually about two weeks later. A full-term pregnancy is around 40 weeks from the LMP.
Related calculators
Count the days with the date calculator or work out a future date with the age calculator. This tool is for general guidance, not medical advice.