Period Calculator - Track Your Menstrual Cycle Free
Advanced Period Calculator
The Period Calculator allows women to forecast the start dates of their future menstrual cycles, as well as ovulation and fertile window estimations for the first cycle. It predicts using the latest menstrual period (LMP), average cycle length, cycle regularity, and number of cycles (1-6). The calculator predicts ovulation 14 days before the next period. The fertile window is defined as 5 days before to 1 day after ovulation, with ±2-day modifications for irregular cycles. The results include a table identifying important events (LMP, fertile window start/end, ovulation, and anticipated period dates) as well as a timeline graphic illustrating the events of the first cycle, which are presented immediately after computation.
How to Use Period Calculator Online
The Advanced Period Calculator makes it easy to predict your menstrual periods. Follow these simple steps to achieve immediate results.
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Step-by-step instructions:
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- Enter the Last Menstrual Period (LMP): Select the beginning day of your latest period (for example, 2025-04-01).
- Input Cycle Length: Enter the average cycle duration in days (e.g., 28).
- Select the Cycle Regularity: Select “Regular (±2 days)” or “Irregular (>±2 days)” in the menu.
- Choose the number of cycles: Determine how many cycles to forecast (1-6, for example, 3).
- Calculate: Click “Calculate” to see the results.
- Review Results: See the projected period dates, first-cycle ovulation, fertile window, event table, and timeline graphic.
Why Use Period Calculator Online?
The Advanced Period Calculator is a valuable tool for women who want for managing their cycles or check their reproductive health. Here’s what makes it stand out:
- Flexible Inputs: Accepts LMP date, cycle length (21-35 days), cycle regularity, and cycle count (1-6).
- Comprehensive outputs: Includes expected period dates, first-cycle ovulation, and fertile window.
- Event Table: Shows LMP, fertile window, ovulation, and up to six period dates following computation.
- Timeline Chart: This chart depicts the events of the first cycle (fertile window in pink, ovulation in blue). js.
- Irregular Cycle Adjustment: Increases ovulation and fertile window by ±2 days during irregular periods.
- Free and accessible: No money or registration necessary; available on any device.
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