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Ovulation Calculator

Find your fertile window, ovulation day, and next period date instantly. Based on your cycle — no app download needed.

Also try: BBT AI Interpreter · Fertility Score Checker

📅 First day of last period

🔄 Average cycle length

🛒 Track ovulation accurately

Pair this calculator with ovulation test strips for best results.

View Ovulation Strips on Amazon →

🔗 Related Tools

→ AI BBT Chart Interpreter — confirm ovulation with temperature data → Fertility Score Checker — get your 0-100 fertility score → PCOS Hub — irregular cycles? Get PCOS-adjusted calculator → Read: When do you ovulate with a 28-day cycle?