Convert years to hours
Convert years to hours instantly. 1 yr = 8,766 h. Formula, worked examples and a quick reference table.
Last updated
One year equals 8,766 hours. To convert any number of years to hours, multiply by 8,766.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Time conversions are exact down to the day and approximate above it. Seconds, minutes, hours and days have fixed ratios, but a month has no fixed length and a year has two — 365 days in the calendar and 365.25 in the astronomical convention used here. For anything with legal or contractual weight, count the actual calendar dates rather than converting a duration, because the difference accumulates precisely where it is least welcome.
years to hours formula
To go the other way, use year = hour ÷ 8,766.
About these units
This uses the Julian year of 365.25 days, the astronomical convention. A calendar year is 365 or 366 days depending on leap years.
The hour is 3,600 seconds. Its length is arbitrary in physical terms: it descends from dividing daylight into twelve parts, which meant the hour changed with the seasons until mechanical clocks fixed it.
Year is also written years and yrs. Hour is also written hours, hr and hrs.
Sources
- International Astronomical Union, Resolution B2 (2012), XXVIII General Assembly — the astronomical unit as exactly 149,597,870,700 m, and the Julian year of 365.25 days from which the light year and parsec follow.
years to hours conversion table
| Year | Hour |
|---|---|
| 1 yr | 8,766 h |
| 2 yr | 17,532 h |
| 3 yr | 26,298 h |
| 5 yr | 43,830 h |
| 10 yr | 87,660 h |
| 20 yr | 175,320 h |
| 25 yr | 219,150 h |
| 50 yr | 438,300 h |
| 100 yr | 876,600 h |
| 250 yr | 2,191,500 h |
| 500 yr | 4,383,000 h |
| 1,000 yr | 8,766,000 h |
Frequently asked questions
How many hours are in a year? +
There are 8,766 hours in one year.
What is 10 yr in h? +
10 yr equals 87,660 h. Multiply 10 by 8,766.
How do I convert hour back to year? +
Use year = hour ÷ 8,766. The converter above handles both directions, or see our dedicated hours to years page.
How accurate is this year to hour conversion? +
The factor used is 8,766, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate yr to h in my head? +
Multiply by 17532 and divide by 2. That approximates the true factor of 8,766 exactly, which is close enough for a mental estimate.