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.

📚 Guia de cálculo local

Lógica da fórmula

Aplicamos fórmulas públicas de finanças, empréstimos, razão e conversão.

Escopo das fontes

Referências seguem padrões públicos e práticas comuns de cada país.

Premissas

Impostos, taxas e limites variam por região e instituição.

Result Interpretation

Use este resultado como cenário base. Antes de decidir, compare com proposta real e regras fiscais locais.

Padrão local

Moeda: BRL

Unidades: metric

Modelo tributário: US payroll estimate

Aviso regulatório

Esta ferramenta usa presets regionais para estimativa. Termos reais e limites legais variam por instituição e legislação local.

Próximas ações recomendadas

  • Compare pelo menos 2-3 instituições locais antes de fechar.
  • Confirme por escrito taxas, impostos e cláusulas de amortização antecipada.
  • Rode cenário de estresse com +1-2% de juros.

Antes de uma decisão real, confirme as regras atuais da instituição local.

Ver detalhes da política