Pregnancy Due Date Calculator – Estimate Delivery Date Online Free

Calculate your estimated due date and see how far along you are. 100% free · Instant results · Works in your browser.

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Average Cycle Length:

Conception Date (estimated): –

Current Pregnancy Week: –

Estimated Due Date: –

Days Until Due Date: –

How to Use Pregnancy Due Date Calculator (3 Easy Steps)

  1. Enter the first day of your last menstrual period (LMP)
  2. Choose your average menstrual cycle length
  3. Click “Calculate” – see your estimated due date and progress instantly

Frequently Asked Questions

Is this due date calculator free?

Yes – 100% free, unlimited use, no signup required.

How accurate is the due date?

It’s an estimate. Only 4-5% of babies arrive on their exact due date. Ultrasound gives more precision.

Why use the first day of last period?

Pregnancy is dated from LMP (Naegele’s rule): due date = LMP + 280 days.

What if my cycle is irregular?

Use 28 days as average or consult your doctor. Early ultrasound is most accurate.

When is conception estimated?

Usually about 14 days after LMP for a 28-day cycle (ovulation time).