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व्यावहारिक

मासिक पाळी कॅल्क्युलेटर

Menstrual Cycle Calculator

First Day of Last Period
Cycle Length (days)
Period Length (days)

What is Period Calculator?

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A period (menstrual cycle) calculator predicts future menstruation dates based on cycle length and period duration. The average cycle is 28 days, but cycles from 21 to 35 days are normal. Tracking helps identify irregularities and plan around key life events.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to Period Calculator

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  1. 1Record the first day of your last period (day 1)
  2. 2Add cycle length to find the next period start date
  3. 3Add period length to find the end date
  4. 4Repeat for subsequent cycles

Worked Examples

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Example 1
Given:Last period: 1 March · 28-day cycle
परिणाम:Next period: 29 March · Fertile window: ~15–19 March

Menstrual Cycle Phases

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PhaseDays (28-day cycle)Key Events
Menstruation1–5Uterine lining sheds
Follicular1–13Follicles develop in ovaries
Ovulation~14Egg released — peak fertility
Luteal15–28Progesterone rises; PMS may occur
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Pro Tip

Cycle irregularity of a few days is normal. Consult a doctor if cycles are consistently shorter than 21 days, longer than 35 days, or if you experience very heavy bleeding.

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Did you know?

The word "menstruation" comes from Latin "mensis" (month) and Greek "mene" (moon). Many ancient calendars were based on the lunar cycle (~29.5 days), close to the average menstrual cycle.

केवळ माहितीच्या उद्देशाने. हे साधन व्यावसायिक वैद्यकीय सल्ला, निदान किंवा उपचारांचा पर्याय नाही. नेहमी पात्र आरोग्य व्यावसायिकांचा सल्ला घ्या.
Deep Dive

Read the full guide on how to use this calculator effectively

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Formula-verified for precision
Reviewed October 2026
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