What is Pregnancy Due Date Calculator?
Wondering when your little one will arrive? Enter the first day of your last menstrual period and your average cycle length, and we'll estimate your due date using the standard Naegele formula. See which week you're in, where you fall in the three trimesters, and a visual progress bar. All calculations happen in your browser for complete privacy.
▶Use Cases5 scenarios
- ◆Estimating pregnancy due date
- ◆Birth planning
- ◆Prenatal checkup scheduling reference
- ◆Pregnancy progress tracking
- ◆Sharing with family and friends
▶How to Use4 steps
- 1Enter the first day of your last menstrual period
- 2Optionally enter your average cycle length
- 3See your estimated due date and current week
- 4View trimester breakdown and progress bar
▶Features8 features
- ✓Naegele formula calculation
- ✓Shows current week
- ✓Trimester breakdown
- ✓Visual progress bar
- ✓Custom cycle length
- ✓Browser-local processing
- ✓Free to use
- ✓Privacy secure
▶FAQ7 questions
What is Pregnancy Due Date Calculator?
An online Estimate your due date from your last menstrual period. See trimesters, current week, and a visual progress bar. Supports multiple input formats with one-click copy or download. All operations run locally in your browser — no uploads.
Do I need to enter my cycle length?
We use 28 days as default. If your cycle is irregular, entering your actual average cycle length improves accuracy.
What calculations does this tool support?
This tool supports various calculations related to its specific domain. All calculations use JavaScript Math APIs for precision.
How accurate are the calculations?
Calculations are performed using JavaScript native Math APIs with standard precision. Results are accurate for typical use cases.
Is my input data uploaded to a server?
No. All calculations happen locally in your browser. Your data never leaves your device, ensuring complete privacy.
Can I use the calculation results commercially?
Yes. All calculation results are free to use for any purpose, including commercial projects. No restrictions.
Do I need to be online?
You need the internet to load the page the first time. After that, it works offline.