Years Between Dates Calculator
Calculate how many years are between two dates. Get the whole years plus leftover months and days, the exact number of years as a decimal, a years, months and days breakdown, and the totals in months and days — instantly in your browser.
ToolsSoup's Years Between Dates Calculator is a free online tool that works out how many years separate any two dates. Pick a start date and an end date and it instantly shows the number of full years plus the leftover months and days, the exact number of years as a decimal, the same span broken down into years, months and days, and the totals in months and days. Everything runs in your browser, so your dates are never uploaded and there is no sign-up.
What is a years between dates calculator?
A years between dates calculator counts how many full years fit between two dates. Because years vary in length — leap years have 366 days while common years have 365 — you cannot reliably divide the number of days by 365. This tool counts whole years the way people naturally do: from January 1, 2020 to January 1, 2024 is exactly four years, regardless of how many leap days fell in between. It then shows the leftover months and days, the precise fractional years, and a full years-months-days breakdown for any span.
How to count the years between two dates
The result updates the moment you change a date, so there is nothing to submit:
- Pick the start date (the earlier date in the range).
- Pick the end date (it defaults to today).
- Read the headline number of full years, then the leftover months and days underneath.
- Check the extra cards for the exact years as a decimal, the full years-months-days breakdown, and the totals in months and days.
Whole years vs. exact (decimal) years
There are two useful ways to express the gap between two dates in years. The whole-year count tells you how many complete years have passed plus the leftover months and days — for example, March 1, 2018 to September 15, 2023 is five years, six months and fourteen days. The exact-years figure expresses the same span as a single decimal number (such as 5.54 years) by adding the fraction of the current year that has elapsed. Whole years suit ages, anniversaries and tenure; the decimal figure is handy for finance, growth rates and interest calculations.
Why year counting is not just days ÷ 365
Because leap years add an extra day roughly every four years, dividing the total days by 365 gives only a rough estimate and drifts further off the longer the range. This calculator instead steps through real calendar years, so it always lands on the right count and handles leap days correctly — including spans that start or end on February 29. If you want the count in months, see our Months Between Dates Calculator; for a pure day count, see the Days Between Dates Calculator; and for someone’s exact age, try the Age Calculator.
Why use this years between dates calculator?
- Counts full years between any two dates the way people actually count them.
- Shows the leftover months and days alongside the whole years for an exact picture.
- Gives the exact number of years as a decimal for finance and growth rates.
- Provides a complete years, months and days breakdown for any span.
- Also reports the totals in months and days for quick cross-checks.
- Handles leap years and February 29 correctly.
- Runs entirely in your browser — your dates are never sent to a server.
- 100% free with no ads, sign-up, or limits.
Frequently asked questions
How do I calculate the number of years between two dates?
Enter a start date and an end date and the tool instantly counts the full years between them, then shows the leftover months and days, the exact years as a decimal, and a full years-months-days breakdown.
How does it count a partial year?
It counts complete years from the start date, then reports the remaining months and days separately. The exact-years figure adds those leftover days back as a fraction of the current year so you get a precise decimal value.
Why not just divide the days by 365?
Leap years add an extra day roughly every four years, so dividing days by 365 is only an approximation and drifts off over long ranges. This calculator steps through real calendar years instead, so the count is always accurate.
Does it handle leap years and February 29?
Yes. The tool uses real calendar dates, so leap years and spans that start or end on February 29 are always handled correctly.
Are my dates kept private?
Yes. All calculations run locally in your browser using JavaScript, so the dates you enter are never sent to or stored on any server.