Introduction
Our Period Calculator helps you predict your next period date and track your menstrual cycle. It provides quick, precise results based on your last period date and your average cycle length.
Period Calculator
Enter your last period date and your average cycle length to calculate your next period date and track your menstrual cycle.
How it Works
The formula:
Next Period Date = Date of Last Period + Average Cycle Length (days)
Enter the first day of your last period and your average cycle length, and the tool predicts your next period.
Usage Guide
- Enter the date of your last period.
- Enter your average cycle length (20–40 days).
- Click Calculate.
- View predicted next period + fertile window.
FAQs
What is a period calculator?
It predicts your next period based on your last date and average cycle length.
When is my next period due?
By adding average cycle length to last period date.
What is a menstrual cycle calendar?
It tracks monthly cycle data to help plan.
What if my cycle is irregular?
Predictions are estimates, may vary if cycles are irregular.