Period calculator

Use the calculator to estimate the future period days and most fertile days.

February, 2023
Low chance of getting pregnant
Period
Approximate day of ovulation
Higher chance of getting pregnant
  • 30
  • 31
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 1
  • 2
  • 3
  • 4
  • 5

The calculator is based on Rhythm method (Knaus–Ogino method), is valid for regular menstrual cycles and shall not be used as contraceptive method.