Free · Health · Pregnancy & Cycle
Pregnancy Conception Calculator
Estimate conception and fertile-window dates from a due date or last menstrual period.
- Checked formula
- Private in your browser
- No signup
Result
Your calculation
- Estimated conception date
- Sunday, February 15, 2026
- Likely fertile window
- Tuesday, February 10, 2026 to Monday, February 16, 2026
- Implantation window estimate
- Saturday, February 21, 2026 to Friday, February 27, 2026
Ovulation and conception timing vary. Dating based on clinical ultrasound may be more reliable.
How to use this calculator
- Enter current measurements as accurately as practical.
- Calculate to see the estimate, range, and method details.
- Use the result as context, and discuss health decisions with a qualified clinician.
Use the result with context
Health results are educational estimates, not a diagnosis or treatment recommendation. A qualified clinician can interpret measurements in the context of your health.