Ovulation Calculator & Fertility Estimator

Find your most fertile days to increase your chances of getting pregnant. This tool estimates your ovulation date and fertile window based on your menstrual cycle information.

Calculate Your Ovulation

YOUR OVULATION CALENDAR

PERIOD
FERTILE WINDOW
OVULATION DAY

NOTE: THIS CALCULATOR ESTIMATES YOUR FERTILE WINDOW BASED ON AN AVERAGE 28-DAY CYCLE WITH OVULATION OCCURRING 14 DAYS BEFORE YOUR NEXT PERIOD. EVERY WOMAN'S BODY IS DIFFERENT, AND CYCLE LENGTHS CAN VARY. FOR THE MOST ACCURATE TRACKING, CONSIDER USING OVULATION PREDICTOR KITS OR MONITORING BASAL BODY TEMPERATURE.

This ovulation calculator provides an estimate of your fertile window and is not a guarantee of pregnancy or of birth control. The calculator assumes a regular menstrual cycle. If you have irregular periods, the predicted ovulation date may not be accurate. Always consult with a healthcare provider for medical advice.