KLOORAOvulation and Period Calculator
Estimate your next period, fertile window and ovulation day from your cycle.
Quick answer: Ovulation and Period Calculator: Estimate your next period, fertile window and ovulation day from your cycle. Everything runs in your browser, so nothing you enter is uploaded or stored.
How to use Ovulation and Period Calculator
- Enter your values in the fields.
- The results update instantly as you type.
- Note or copy the numbers you need.
Features
- Instant results
- Free, no signup
- Runs in your browser, nothing is uploaded
- Works on phone and desktop
Frequently asked questions
How is ovulation estimated?
Ovulation usually happens about 14 days before the next period, so cycle length minus 14 days after the first day of your last period.
Is this accurate?
It is an estimate. Cycles vary, so use it as a guide and not as contraception.
Is the Ovulation and Period Calculator free?
Yes. It is free, needs no signup and works on any device.