Pregnancy Due Date Calculator
Estimate your due date from your last period
Estimated due date
days to go
Progress
Trimester
Note: uses Naegele's rule (LMP + 280 days, adjusted for cycle length). Only ~5% of babies arrive on the exact date — always confirm with your doctor.
Pregnancy Due Date Calculator — Complete Guide & Instructions
MakeCard Pregnancy Due Date Calculator estimates your expected delivery date from the first day of your last menstrual period using Naegele's rule — 280 days from the LMP, adjusted for your cycle length. It also reports how far along you are in weeks and days, which trimester you are in, and a visual progress bar to the due date. It gives a fast, private estimate to discuss with your doctor.
How to Use Pregnancy Due Date Calculator
- 1 Pick the first day of your last period on the date field.
- 2 Enter your cycle length in days (21–35; 28 is typical).
- 3 Press Estimate due date.
- 4 Read the estimated due date, days to go, current week progress, trimester, and the progress bar.
Key Features & Capabilities
- Naegele's rule calculation adjusted for your personal cycle length.
- Estimated due date plus a live "days to go" countdown.
- Current progress in weeks and days.
- Trimester indicator (1st, 2nd, or 3rd).
- Visual progress bar toward the due date.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Method | Naegele's rule — LMP + 280 days, adjusted for cycle length |
| Inputs | Last period start date, cycle length 21–35 days |
| Outputs | EDD, days remaining, weeks + days progress, trimester |
Practical Everyday Use Cases
- Getting a first estimate of the delivery date before the initial scan.
- Tracking which week and trimester a pregnancy is currently in.
- Planning maternity leave dates around the expected due date.
- Estimating conception-to-birth timelines for planning discussions.
Pro Tips for Best Results
- Only about 5% of babies arrive on the exact estimated date — treat it as a window, not a deadline.
- If your cycle is irregular, an early ultrasound dating scan is more accurate than LMP math.
- Enter the first day of bleeding, not the last day, for the LMP.
Common Problems & Solutions
Cycle lengths other than 28 days shift the estimate — check the cycle length field matches your usual cycle.
Use your best estimate, then rely on the doctor's ultrasound dating — it overrides LMP-based dates.
Privacy & Security
100% Client-Side Execution
Your dates are processed entirely in your browser — no health information is transmitted, logged, or stored.
Frequently Asked Questions
Everything you need to know about using Pregnancy Due Date Calculator
By Naegele's rule: 280 days (40 weeks) are added to the first day of your last period, then adjusted for your cycle length.
It is an estimate — only around 5% of babies arrive on the calculated day. Doctors refine the date with an ultrasound in the first trimester.
Enter your actual cycle length — the tool adjusts the estimate, since ovulation (and thus conception) happens later in longer cycles.
The progress figure shows your current weeks and days — for example 12w 3d means the 13th week. The trimester is shown alongside.
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