In 1 years there are 8,760 hours. Meanwhile in 1 hours there are 0.000114 years. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Hours to Years calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To do a years to hours conversion, multiply the number of years by the number of hours in a year.
Common examples:
If you need more accuracy across real calendars, account for leap years:
Tip: For everyday use, 8,760 hours per year is the standard choice. For long time spans, the 8,766 hours per year average often fits better.
A common year has 8,760 hours. That comes from 365 days × 24 hours. Many people use this number for time tracking, work plans, and project schedules.
A leap year has 8,784 hours. It has 366 days, so the math is 366 × 24. Leap years happen every 4 years, with some century rules.
Use this simple formula:
Hours = Years × Days per year × 24
For a quick estimate, many people use 365 days per year. For higher accuracy over long periods, account for leap years.
The average year length is close to 365.25 days because leap years add an extra day about every 4 years. Using 365.25 gives a better long-range average:
Hours ≈ Years × 365.25 × 24
This works well for planning across many years, not for one exact calendar year.
For a standard year:
1 year = 365 × 24 = 8,760 hours
If the year is a leap year:
1 year = 366 × 24 = 8,784 hours
For two standard years:
2 years = 2 × 8,760 = 17,520 hours
If one of those years is a leap year, add 24 hours. If both are leap years (rare back-to-back), add 48 hours.
Using standard years:
5 years = 5 × 8,760 = 43,800 hours
If there’s 1 leap year in that span, add 24 hours. If there are 2 leap years, add 48 hours.
Using standard years:
10 years = 10 × 8,760 = 87,600 hours
In a typical 10-year period, you often have 2 or 3 leap years, so the total can be 87,648 hours (2 leap years) or 87,672 hours (3 leap years).
Not always. In everyday use, a year usually means a calendar year with 365 days (or 366 for leap years). In some fields, “year” can mean an average year (365.25 days) or a 360-day year for simple finance math.
Each leap year adds 1 extra day, which equals 24 extra hours. Over many years, those extra days add up. If you need precision, count how many leap years fall in the range.
A calendar year is either:
An average year uses 365.25 days, which is:
This average is useful for long time spans.
Daylight saving time can change the number of hours in a local calendar year by about 1 hour in places that observe it. One day in spring has 23 hours, and one day in fall has 25 hours. Over the full year, it usually balances out, but exact totals can vary by time zone rules.
Not always. If you don’t know the exact years involved, you can’t know how many leap years occur. For exact results, you need the start and end dates (or at least which years are included). For estimates, use 8,760 hours per year or 8,766 hours per year as an average.
For a fast estimate:
Hours ≈ Years × 8,760
For a better average over long periods:
Hours ≈ Years × 8,766
The Calculate Box tool to convert years to hours uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a years value in the box and have it instantly converted to hours.