Free tools
Four simple tools to help you understand your cycle — no account, no cost. Estimates only; your body writes the final answer.
Predict when your next period will arrive
Track period →Figure out your most fertile days
Find fertile days →Track your beta hCG doubling time
Check hCG →Estimate your expected delivery date
Estimate due date →Predict when your next period will arrive.
Enter your last period date to see your next cycle.
Figure out your most fertile days and when to start LH testing.
Enter your last period date to map your fertile window.
Track your beta hCG doubling time during early pregnancy.
Enter two beta hCG values to see your doubling time.
hCG patterns vary widely. Only your care team can interpret your results — always review them with your provider.
Estimate your expected delivery date and how far along you are.
Pick a date to estimate your due date.
Calculators use averages. LH and hCG testing shows what your body is actually doing this cycle.
These calculators are for educational purposes only and are not medical advice, diagnosis or treatment. Talk with a licensed clinician about your fertility or pregnancy.