Toolkit Shelf

Everyday Calculators

Days Between Dates Calculator

Use this days between dates calculator to count calendar days, weeks, and weekdays between a start date and an end date.

Reviewed May 25, 2026EstimateFormula shown

Live calculator

Days between dates

Calendar days30 days

The end date is after the start date.

Weeks4.3 weeks

Calendar days divided by seven.

Weekdays22 weekdays

Counts Monday through Friday only.

Formula

Days between dates formula

Days between dates = end date - start date

Choose include end date when the final day should count as a full day.

How to use

Steps

  1. Enter the start date.
  2. Enter the end date.
  3. Choose whether to include the end date.
  4. Read calendar days, weeks, and weekdays.

Example

Sample calculation

Start dateMay 25, 2026
End dateJune 24, 2026
Calendar days30 days

Calculator use

Best for

  • Quick days between dates from start date, end date and counting method.
  • Quick everyday math with the result and formula in one place.
  • Shopping, date, time, unit, school, or household comparisons.
  • A fast check before moving the numbers into a spreadsheet.

Before relying on it

Check first

  • Entering start date, end date and counting method from different time periods or scenarios.
  • Mixing units, dates, or original values across the same calculation.
  • Rounding early and then using the rounded number in another step.
  • Copying a result without checking whether the inputs match the real-world question.

Benchmarks

How to read the result

The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions.

7 days1 week

Common for reminders, return windows, and short deadlines.

30 daysAbout 1 month

Useful for billing cycles, trials, and monthly planning.

90 daysAbout 1 quarter

Useful for warranties, business planning, and project timelines.

Calculator accuracy

Methodology and assumptions

The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.

Formula

Days between dates = end date - start date

Inputs used

Start date, End date, Counting method

Limitations

Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.

Last reviewed

May 25, 2026

Cite this page

Toolkit Shelf. Days Between Dates Calculator. Retrieved May 25, 2026, from https://toolkitshelf.com/tools/days-between-dates-calculator

FAQ

Common questions

How do I count days between two dates?

Subtract the start date from the end date. This calculator also shows weeks and weekdays.

Should I include the end date?

Include the end date when the final day should count as a full day, such as a trip or event window.

Does this count weekends?

Calendar days include weekends. The weekday result counts Monday through Friday only.