Pregnancy Due Date Calculator
Estimate due date based on the first day of the last menstrual period.
Inputs
Results
Estimated Due Date
10/8/2026
Gestational Age (weeks)
7.9
Days Until Due Date
225
Tips
Try multiple scenarios to compare outcomes before making decisions.
Facts
Small changes in rates, percentages, or timelines can have a large compounding effect.
Notes
Results are educational estimates and may differ from official statements.
How this calculator works
- Pregnancy Due Date Calculator uses your inputs and standard math formulas to compute the results instantly.
- Edit any field to see updated values right away and compare scenarios.
- Use these estimates for planning, then confirm final numbers with your lender, employer, or provider when needed.
Last updated: February 2026. See our methodology and editorial policy.
Worked Example
Example using the current inputs:
Inputs
- Last Menstrual Period (LMP): 2026-01-01
Outputs
- Estimated Due Date: 10/8/2026
- Gestational Age (weeks): 7.9
- Days Until Due Date: 225
Assumptions and Limitations
- Results are educational estimates and may differ from official statements.
- Results are estimates and should be validated for high-stakes decisions.
- Inputs are interpreted using standard units and rounding rules for readability.
FAQ
How accurate is this pregnancy due date calculator?
It follows standard formulas and provides practical estimates for quick planning.
Can I use this on mobile?
Yes. The calculator is optimized for mobile, tablet, and desktop use.
Are my values saved?
Inputs are stored locally in your browser to improve convenience on return visits.
Related Calculators
Explore more calculators and converters for related scenarios.
Related Trackers
Keep your progress organized with matching trackers on SimpleTrackers.io.