Bae Tools
Calculators for your cycle.
Free, instant answers for your period, ovulation and pregnancy. No sign-up needed — create an account if you want to save your results to your dashboard.
Free
Next period date
Predict your next period from your last period + average cycle length.
Free
Ovulation & fertile window
Find your fertile days from your cycle length and last period.
Free
Pregnancy week calculator
Work out your week and trimester from your last menstrual period or due date.
Want it to learn your cycle?
The tools are free to use, but they're far more useful when they sit inside your own tracker. Sign in and your last result auto-fills, predictions sharpen with every cycle you log, and everything saves to your dashboard.
Accounts are free, no email marketing, and your data is encrypted. Delete everything in one click from settings.
Create your free account