Pregnancy Due Date Calculator
Estimate your due date, current week, and trimester from your last period.
Your files never leave your device. No upload. No sign-up.
About the Pregnancy Due Date Calculator
Estimate your pregnancy due date using the standard Naegele's rule: 280 days from the first day of your last menstrual period (LMP). You'll also see how many weeks pregnant you are right now, which trimester you're in, and how many days remain until your estimated due date. This is an estimate only — always consult your healthcare provider for medical guidance.
How to use the Pregnancy Due Date Calculator
- 1Select the first day of your last menstrual period (LMP).
- 2Read your estimated due date.
- 3See your current pregnancy week, trimester, and days remaining.
Why use our Pregnancy Due Date Calculator
Naegele's rule
Due date = LMP + 280 days, the same method used by most providers.
Week & trimester
Automatically shows how far along you are today.
Countdown
Days remaining until your estimated due date.
Private
Your date is processed locally — nothing is uploaded.
Frequently asked questions
How accurate is the LMP-based due date?+
Only about 4–5% of babies are born on their exact due date. The LMP method assumes a 28-day cycle and ovulation on day 14. An early ultrasound is more accurate, especially if your cycle is irregular.
When do the trimesters begin and end?+
We use the common convention: first trimester is weeks 1–12, second trimester is weeks 13–26, and third trimester is week 27 onward.
What if my cycle isn't 28 days?+
The LMP estimate assumes a 28-day cycle. If yours is significantly shorter or longer, your due date may shift by several days. Ask your provider for a confirmed estimate.
Is this medical advice?+
No. This is an estimate for general information only. Always consult a qualified healthcare provider for medical decisions.