Is My Period Late? Late Period Calculator

Enter the first day of your last period and your usual cycle length. You'll see the date your period was expected, how many days past it you are today, and whether that's still inside the range your own dates give.

Not sure of your cycle length? Count from the first day of one period to the first day of the next. Period length is optional (we assume 5 days).
add more period dates (optional, sharpens the range)

Earlier period start dates, any order. With 3 or more, the range comes from your own cycles instead of the setting above.

This is an estimate from your dates, not a diagnosis. If you're worried, talk to a clinician.

is it late?

Pick the first day of your last period and you'll see straight away whether your period is late, by how many days, and whether that's still inside your range.

How is a late period worked out?

Your period is late when today is past the date it was expected. The expected date is the first day of your last period plus your cycle length, and the days between that date and today are how late you are. If your last period started on March 1 and your cycle is 28 days, the expected date is March 29, so on April 2 you're 4 days late.

A single date can look more exact than it is, so the calculator also gives a range. With one date it allows a few days either side, and with several period dates it uses how much your own cycles have moved. That's how it tells you whether you're late but still inside your range, or past it.

Why do cycles shift?

Your period follows ovulation, so when ovulation moves, the period moves with it. Stress, illness, travel, changes in sleep or exercise, and coming off hormonal birth control can all nudge that timing. Read why a period can be late for the full picture.

When is a pregnancy test designed to be used?

Most home pregnancy tests are designed to be used from the day your period is due, according to the NHS. The calculator shows that date from your dates. If you're worried about anything, talk to a clinician.

Common questions

Your period is late when today is past the date it was expected. Take the first day of your last period and add your usual cycle length to get the expected date. The calculator does that for you and counts the days between that date and today.

Technically yes, but cycles move around a few days from month to month, so a day or two past the date often still sits inside your own range. The calculator tells you whether the number of days late is still inside the range your dates give or past it.

Tick the birth control box and it changes what it says. On hormonal birth control, bleeding usually follows your method's schedule rather than ovulation, so the calculator doesn't call a bleed late.

One cycle length can't capture that. Open the add more period dates box and enter the first days of your last few periods. The calculator then uses your own cycles, so the range stretches or shrinks to match how much they move.

Educational content, not medical advice. This calculator gives you an estimate from your dates, not a diagnosis. Veya is a tracking tool, not a substitute for professional medical care. Want predictions beyond lateness? Try the period calculator.