The Utility Base

Ovulation Calculator

Calculate Ovulation Date, Fertile Window & Next Period

Enter your last period start date and average cycle length to find your estimated ovulation date, fertile window, and next period date.

🌸 What is Ovulation?

Ovulation is the release of a mature egg from the ovary. It typically occurs 14 days before the next expected period. The fertile window spans about 6 days: 5 days before ovulation through the day of ovulation, when pregnancy chances are highest.

📝 How to Use

  1. Select your last period start date
  2. Enter your average cycle length (typically 21-35 days)
  3. Click calculate
  4. View your ovulation date and fertile window
  5. Check the 3-month calendar for visual fertile period tracking

💡 Helpful Tips

  • If your cycle is irregular, use the average of the last 6 months
  • Use ovulation test strips (LH strips) for more accuracy
  • Basal body temperature rises 0.2-0.5F after ovulation
  • 2-3 days before ovulation have the highest conception rates
  • Stress, travel, and weight changes can affect your cycle

❓ FAQ

How accurate is ovulation calculation?

It is fairly accurate for those with regular cycles, but individual variation exists. For better accuracy, combine with ovulation test strips or basal body temperature tracking.

What if my cycle is irregular?

Record your cycles for the last 6 months and use the average. If cycles vary by more than 7 days, consult a gynecologist.

Can I only get pregnant during the fertile window?

The fertile window has the highest probability, but sperm can survive up to 5 days inside the body, so pregnancy is possible outside the calculated window.

This calculator is for reference only and does not replace medical advice. Consult a gynecologist for accurate diagnosis.

📚 Panduan perhitungan lokal

Logika rumus

Menggunakan rumus publik untuk keuangan, pinjaman, rasio, dan konversi satuan.

Cakupan sumber

Mengacu pada standar publik dan praktik umum per negara.

Asumsi

Pajak, biaya, suku bunga, dan batas berbeda antar wilayah/lembaga.

Result Interpretation

Gunakan hasil ini sebagai skenario dasar. Sebelum memutuskan, bandingkan dengan penawaran nyata dan aturan pajak lokal.

Preset lokal

Mata uang: IDR

Satuan: metric

Model pajak: US payroll estimate

Catatan regulasi

Alat ini memakai preset regional untuk estimasi. Syarat nyata dan batas hukum dapat berbeda menurut lembaga dan aturan lokal.

Aksi yang disarankan

  • Bandingkan minimal 2-3 penyedia lokal sebelum final.
  • Cek ulang biaya, pajak, dan klausul pelunasan dipercepat secara tertulis.
  • Uji skenario stres dengan bunga +1-2% dan pendapatan turun.

Sebelum keputusan nyata, pastikan aturan terbaru di lembaga setempat.

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