Pregnancy Due Date Calculator
Calculate your pregnancy due date and current week from your last period. Free, private due date tool.
Frequently asked questions
- How is the due date calculated?
- By adding 280 days, or 40 weeks, to the first day of your last menstrual period - the standard clinical rule.
- Does it show my current progress?
- Yes: completed weeks and days, which trimester you are in, and how many days remain.
- How accurate is it?
- It is an estimate. Cycle length varies, so your midwife or doctor may adjust the date after an ultrasound.
- Is my date uploaded?
- No. Everything is computed locally in your browser.
This tool runs entirely in your browser. No data is uploaded anywhere.