Pregnancy Due Date Calculator
Use clearly labeled inputs and visible assumptions to estimate a due date and pregnancy timing from the first day of the last menstrual period.
Verify this calculatorLimited scope
See what the result uses—and what it cannot know.
Sumvoro calculates deterministically from the visible inputs. It does not invent lender terms, local rules, market values, medical facts, or professional judgments.
- 1 · InputsCheck every entered value against the latest statement, quote, measurement, or official source.
- 2 · Formula
Estimated due date = LMP + 280 days + (usual cycle length − 28 days). - 3 · SensitivityUse Insights to run a lower and higher case. If the conclusion changes easily, collect better information or leave more margin.
- 4 · ScopeThis tool has intentionally limited scope. Read its assumptions and do not treat the output as professional advice or an exact official determination.
- Formula release
- 2026.10-r4
- Release date
- October 10, 2026
- Review status
- Limited scope
- Source review
- September 12, 2026
Optional readingLearn how this calculator works
How the pregnancy due date calculator works
Estimate a due date and pregnancy timing from the first day of the last menstrual period.
Estimated due date = LMP + 280 days + (usual cycle length − 28 days).
Read our calculation methodology and limitations.
Example
Start with the guided example, then replace each value with your own measurements, dates, schedule, price, or plan.
What affects the result
- Only a small share of births occur on the exact date.
- Cycle timing and conception can differ.
- Clinical dating may revise the estimate.
Frequently asked questions
What should I enter?
Each field explains the measurement, date component, unit, or cost expected. Keep units consistent and use current information.
Is this medical advice?
No. This is an educational estimate and does not diagnose, treat, or replace individualized medical guidance.