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Menstrual Cycle Calculator

Menstrual Cycle Calculator

First Day of Last Period
Cycle Length (days)
Period Length (days)
For informational purposes only. This tool is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional.
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Pro Tip

Cycle tracking apps are not reliable contraception. Only fertility awareness methods (FAM) with proper education provide effective natural family planning.

Difficulty:Beginner

Did you know?

The mathematical principles behind menstrual cycle have practical applications across multiple industries and have been refined through decades of real-world use.

Mathematically verified
Reviewed May 2026
Used 9K+ times
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