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Cycle Length Calculator Worksheet

A simple worksheet for counting cycle length from period start dates, finding a range, and using that range for calendar planning.

Cycle length is simple date math.

Count from day 1 of one period to day 1 of the next.

Do not count only bleeding days.

Do not start from the last day of bleeding.

Gather start dates

Use dates you already know.

Period start Date Where I found it Most recent 1 before 2 before 3 before 4 before 5 before

Where you found it can be "memory," "paper," "old app," or "calendar."

Count each cycle

Count every day from one start date to the next start date.

Cycle Start date Next start date Cycle length 1 2 3 4 5

Example:

Start date Next start date Cycle length June 1 June 29 28 days

Find your range

Use your own list.

Number to find Your answer Shortest cycle Longest cycle Most common cycle length Average, if useful Number of cycles counted

The shortest and longest numbers are often more useful than one average.

They help you plan a window.

Average cycle length

Use this only if your cycle lengths are close.

Step Your work Add all cycle lengths Count how many cycles you used Divide total by cycle count Average cycle length

Round to the nearest whole day.

A half day is not useful for a period plan.

Use the number for planning

Planning job Use this number Pick one calendar estimate Average or most common cycle length Pack supplies early Shortest cycle length Keep supplies ready longer Longest cycle length Make a date range Shortest and longest cycle length

For the next date, use the next period date estimate worksheet.

For a full calendar plan, use the period calculator planning sheet.

What sources say

Office on Women's Health says a cycle starts on the first day of your period.

It says the count ends when the next period starts.

MedlinePlus uses the same count.

It says tracking each month can help you know your usual cycle.

That is all this sheet does.

It counts dates.

It does not tell you why a cycle changed.

Keep or delete notes

Cycle length notes can be sensitive.

They show dates and patterns.

They may also show travel, school, work, stress, or symptoms.

Floriva can keep these notes on your device.

You choose what stays.

You choose what gets exported.

You choose what gets shared.

For a larger record, use the personal cycle health record template.

For a printable tracker, use the period symptom tracker printable.