Menstrual Cycle Calculator

This Menstrual Cycle turns the figures for menstrual Cycle into a result you can review. Keep the inputs, units and time period consistent.

First day of last period

Cycle length (days)

Next period

—

Then—

Estimate only. Confirm with your healthcare provider.

✉ Email me this result

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How it works

Next period = last period + cycle length

How to use the Menstrual Cycle

Enter the requested values and start with one realistic example. Read the result together with its unit or label, then change one input at a time if you want to compare options.

This is a general estimate and cannot replace advice from a qualified health professional.

Frequently Asked Questions

How does the Menstrual Cycle Calculator work?

Predict your next few period start dates from your last period and cycle length.

Is this medical advice?

No. It gives general estimates only. For decisions about your health, speak with a qualified professional.

Can I use the result as an exact answer?

Treat it as an estimate or check unless the page and the rules that apply to you confirm otherwise. Rounding, fees and personal details can change the final result.