Due Date Calculator: How It Works and How to Use It
Estimate your pregnancy due date and current week from your last menstrual period or conception date.
Like every tool on UltimateTools, it runs instantly in your browser, updates as you type, and doesn't require an account or sign-up to use.
What it calculates
Estimate your due date and current week of pregnancy.
Whether you think of it as a "due date calculator" tool, a "pregnancy calculator or ovulation calculator" tool, or simply the Due Date Calculator, this page covers the same calculation.
You can find it at any time on the Due Date Calculator page, where the calculator sits above a full explanation of the method it uses.
Tips for an accurate result
Keep a simple log of results over time; a single app or notebook is more useful than remembering numbers from memory.
Re-measure and recalculate periodically rather than once — bodies and circumstances change, and a stale number can mislead you.
Compare a result against a normal range rather than treating it as a single pass/fail target — most of these figures work as ranges, not thresholds.
These estimates are general-population formulas, not medical advice — check with a professional for anything that affects a health decision.
Related tools worth trying
If you found the Due Date Calculator useful, Heart Rate Zone Calculator, Body Fat Calculator, Weight Tracker cover closely related ground and are worth a look next.