Calculated from the usual cycle length you entered.
Intent-focused tool page
Late period calculator
Use this late period calculator to estimate whether your period is due today, still a few days away, or already late based on your usual cycle.
Based on your usual cycle
Check whether your period is late right now
Enter the first day of your last period and your usual cycle length to estimate when your period should arrive and whether it is already late.
Last period start
Usual cycle length28 days
Today matches the expected date.
A steadier rhythm makes this estimate more reliable.
Useful context for the same cycle timeline.
When the period is still inside the expected window, the page works best as a reassurance tool with a gentle tracking prompt.
If your cycle is usually steady, this estimated date is the main timing anchor for planning.
What this page helps with
Use one clear date to judge where you are in the current cycle.
Check the timing anchor
A single expected date helps you see whether you are still inside your usual cycle window or already past it.
Compare with recent changes
If the result feels off, compare it with recent stress, travel, sickness, or sleep disruption.
Plan the next step
A calm estimate helps with testing plans, appointments, travel, and symptom tracking.
FAQ
The calm answers most people need on this page.
How does a late period calculator work?
This page adds your usual cycle length to the first day of your last period. The result is a planning estimate.
Why can my expected date move around?
Travel, stress, illness, sleep changes, and recent hormonal changes can all shift your period timing.
When do people usually take a pregnancy test?
If your period is several days late and pregnancy is possible, many people use a home test after the missed date.
When should I seek medical support?
Very late, repeatedly missed, or unusual periods deserve support from a licensed clinician.