About the Ovulation & Due Date Calculator
Ovulation usually occurs about 14 days before your next period, and the fertile window covers the five days before ovulation plus the day itself. Enter the first day of your last period and your cycle length to see your fertile days, estimated due date and key pregnancy milestones.
How to use it
Fill in the fields above. Results update automatically as you type, so you can compare scenarios in seconds. Nothing you enter is sent to a server or stored.
Are the results accurate?
The calculators use standard published formulas, but every result is an estimate for planning and education. Your real figures depend on details that vary by person, lender, employer or provider.