Pregnancy

Pregnancy Due Date Calculator

Built by Kevin Glover · @gloverbuilds · Verified formula

Enter the first day of your last period or conception date to estimate your due date, trimester timeline, and key milestones.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

How Due Dates Are Calculated
Pregnancy Timeline & Milestones

Calculation

Naegeles rule: LMP + 280 days। Or LMP + 7 days - 3 months + 1 year। First trimester ultrasound most accurate (±5 days)। Only 5% babies born on exact due date! Normal: 37-42 weeks।

India

Govt hospital delivery: ₹5,000-15,000। Private: ₹50K-3L। Janani Suraksha Yojana: ₹1,400 cash incentive। C-section rate India: 17% govt, 47% private (overuse concern)।

⚡ CalcWolf Insight

Due date calculator is one of the most emotionally significant searches a person makes — 130K+ monthly. Users return repeatedly throughout pregnancy to check their current week. Average session: 4+ minutes with high engagement on milestone information. This page has excellent potential for related content linking to baby budget, nursery planning, and pregnancy nutrition calculators.

Frequently asked questions

कैसे calculate?▾

LMP + 280 days। Or LMP + 7 days, minus 3 months।

Due date accurate?▾

Only 5% on exact date। 80% within 37-42 weeks। ±2 weeks normal।

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →