Missed Period Calculator

How late is your period and what to do next. Free, private and instant.

How to use the Missed Period

  1. Pick first day of your last period.
  2. Enter average cycle length (days).
  3. Press Calculate to get an instant result with a colour scale, chart and plain-English explanation.

About the Missed Period

Enter your last period and cycle length to see whether your period is late, how many days late it is, and what to do next. It also lists the most common reasons for a missed period besides pregnancy.

Also known as: late period calculator, how late is my period, days late calculator, missed period date.

Worked example

Dates in this example are worked out as if today were 5 Nov 2026.

Days until period is due: 14 days (Not late yet). Your period is not due until 19 Nov 2026 (in 14 days).

Formula and cut-offs

Expected date = last period + cycle length. Days late = today - expected date. A period more than 90 days late needs medical review.

Frequently asked questions

How many days late is a missed period?

A period is generally considered missed if it is more than 5 to 7 days past its expected date.

Can I be late and not pregnant?

Yes. Stress, illness, weight change, PCOS, thyroid problems, breastfeeding, intense exercise and perimenopause are common causes.

When should I see a doctor about a missed period?

If you have missed 3 periods in a row, or tests are negative but periods stay absent or you have severe pain.

Sources and references

Written and checked by the MediHub editorial team against the sources above. Read how we build and review our calculators.

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Last updated . This calculator is for education only and is not medical advice. See the medical disclaimer.