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Period Calculator — Track & Predict Your Cycle

Predict your next period dates for the next 6 months

✓ 100% Free ✓ 6-month forecast ✓ No registration

Calculate your next period

Enter your cycle data to get accurate predictions for the next 6 months

Understanding Your Menstrual Cycle

Know your cycle to live more comfortably and plan your life

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What's a normal cycle?

Normal menstrual cycle

A normal menstrual cycle lasts 21–35 days. Every cycle is different — what matters most is its regularity, not its exact length.

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Normal period duration

Duration of menstruation

Normal periods last 2–7 days. If they last more than a week or are very heavy, consult your doctor.

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When to worry?

Signs requiring medical attention

Repeated delays, unusually heavy bleeding, intense pain, or sudden cessation — all require a medical consultation.

Causes of Late Periods

Many reasons can affect cycle regularity

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Pregnancy

The first thing to rule out. Take a test after one week of delay if you are of reproductive age.

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Stress and anxiety

Intense stress affects hormones and can delay ovulation and menstruation by several weeks.

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Weight changes

Rapid weight loss or significant weight gain can cause cycle disruptions.

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Intense exercise

Very intense sport, especially in professional athletes, can affect cycle regularity.

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Medications and hormones

Contraceptive pills, hormonal medications, and certain psychiatric drugs can affect the cycle.

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Thyroid problems

Hypothyroidism or hyperthyroidism affects hormones and can cause menstrual cycle disorders.

Frequently Asked Questions

Is an irregular menstrual cycle normal?
A slight variation (2–4 days) between cycles is perfectly normal. But if the variation is significant (more than 7 days) or cycles are very irregular, it's recommended to see a specialist doctor.
When is a period considered late?
A period is considered late if it exceeds the expected date by more than 5 days. A delay of up to one week is common and generally doesn't cause concern. A delay of more than two weeks requires a pregnancy test and medical consultation.
Can you be pregnant despite period-like bleeding?
Yes, in some cases implantation bleeding (light and pale-colored) can occur when the embryo implants in the uterine wall. It resembles a period but is lighter. If in doubt, take a pregnancy test.