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There are plenty of places online to find a menstrual cycle calculator. Tampax has a very nice menstrual cycle calculator. It is simple and easy to use.
Use a calculator.
Use a ruler
1.99916632 Use a calculator.
If you are using a scientific calculator you will have a key labelled "log". To find the logarithm (to base 10) of a number, simply enter "log" followed by the number that you want to log. If you want a natural logarithm - log to the base e - use the "ln" key instead. If you haven't got a scientific calculator, use the one on your computer.