📊Health & Pregnancy

Period Calculator — 🇿🇦 South Africa

Predicts upcoming period dates for the next several cycles from cycle history. Pre-configured for South Africa with Africa/Johannesburg timezone and DD/MM/YYYY date format.

Add / Subtract Days Calculator

How to Use the Period Calculator

  1. Enter your input values using the fields in the calculator above
  2. Select any additional options (units, format, timezone) if applicable
  3. Click the Calculate button to get your instant result
  4. Copy the result using the Copy button for use elsewhere
  5. Scroll down for real-world examples and explanations
🇿🇦 South Africa configuration: Timezone set to Africa/Johannesburg · Date format DD/MM/YYYY · Language EN

About the Period Calculator

Predicts upcoming period dates for the next several cycles from cycle history. This tool uses the proleptic Gregorian calendar and the IANA timezone database for accurate results across all dates, timezones, and leap years.

All formulas validated by Vipul Jaganiya, Computer Science expert in Calendar Mathematics and Timezone Engineering.

More Health & Pregnancy Tools

🌸
Ovulation Calculator
Predicts your ovulation window and most fertile days from your cycle length and last period.
🤰
Pregnancy Due Date
Calculates the estimated due date from the last menstrual period using Naegele's rule.
🔬
IVF Due Date
Calculates the IVF due date from egg retrieval or embryo transfer date.
📐
Gestational Age
Calculates gestational age in weeks and days from the LMP or ultrasound date.
← View all Health & Pregnancy tools