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.

📚 Guía local de cálculo

Lógica de fórmula

Se aplican fórmulas públicas de finanzas, préstamos, ratios y conversión.

Alcance de fuentes

Tomamos como referencia estándares públicos y prácticas habituales por país.

Supuestos

Impuestos, comisiones, tasas y límites cambian según región e institución.

Result Interpretation

Usa este resultado como escenario base. Antes de decidir, compáralo con oferta real y fiscalidad local.

Configuración local

Moneda: EUR

Unidades: metric

Modelo fiscal: US payroll estimate

Aviso normativo

Esta herramienta usa valores locales para estimación. Las condiciones reales y límites legales dependen de la entidad y del país.

Acciones recomendadas

  • Compara al menos 2-3 entidades locales antes de contratar.
  • Verifica por escrito comisiones, impuestos y cláusulas de prepago.
  • Simula un escenario de estrés con +1-2% de interés.

Antes de decidir, verifica las reglas actualizadas de la entidad local.

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