Pregnancy Calculator | Free Due Date & Pregnancy Week Tool 2026

Pregnancy Calculator: Due Date & Gestational Age

Estimate your due date, current pregnancy week, trimester, and conception date based on last menstrual period (LMP) or due date. Helpful for expecting parents and healthcare planning.

Calculate by:

Select method and enter date.

📊 Calculations: 0

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📸 Live preview — Due date and pregnancy week estimator.

Why Use a Pregnancy Calculator?

A pregnancy calculator helps expectant parents track gestational age, estimate due date, and understand trimesters. It uses the standard 40‑week gestation model. You can calculate either from your last menstrual period (LMP) – adding 280 days – or from a known due date. Knowing the exact week helps with prenatal care, ultrasound timing, and baby development milestones.

Our tool also calculates conception date (around day 14 of cycle) and shows the current trimester. All calculations are based on medical guidelines (Naegele's rule).

📌 How to Use

Choose calculation method: LMP or Due Date.
Enter the date.
Click "Calculate Pregnancy".
View gestational age, due date, trimester, and conception.

✨ Features

📅 Due date estimation (Naegele)

🕒 Gestational age (weeks+days)

📆 Trimester calculation

🔬 Conception date approx.

📱 Mobile‑friendly

🆓 Unlimited free

🔍 Most Searched Keywords

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⚙️ How It Works

For LMP: due date = LMP + 280 days. Gestational age = today - LMP. Conception = LMP + 14 days. Trimester: 0‑12 weeks = first, 13‑27 = second, 28‑40 = third. For due date input, LMP is back‑calculated (due date - 280 days) then same formulas.

🎯 Benefits

✅ Plan prenatal visits.
✅ Monitor baby's growth.
✅ Free and accurate.

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❓ FAQ

❓ Is this medically accurate?
It's an estimator. Always consult your doctor.

❓ What if my cycle is irregular?
This assumes a 28‑day cycle. Ultrasound may adjust due date.

❓ Is it free?
Yes, forever.