Period Calculator

Predict your next period date and track your menstrual cycle easily.

✓ Free to use ✓ Instant results ✓ Mobile friendly ✓ No sign-up needed

First Day of Last Period

Average Cycle Length (days)

Period Duration (days)

Next Period

Period Ends

Days Until

🌸 Comfort essentials for your cycle

How Period Prediction Works

Add your average cycle length to the first day of your last period to predict the next period start date.

What is a normal cycle length?+

Most cycles range from 21 to 35 days, with 28 days being average.

What if my cycle is irregular?+

Use the average of your last 3–6 cycles for a more accurate prediction.

📅

Enter your email and we'll send you your personalised Period Calculator result — free!

By submitting you agree to our Privacy Policy and Terms of Service. We'll never sell your data or spam you.

No thanks — just show my result