About this calculator
Months and years vary in length, so the calculator uses their average lengths on the Gregorian calendar.
How to use it
- Enter the value.
- Choose the unit it is in and the unit you want.
- Read the result, or see every unit in the table.
The formula
Result = value × (seconds in the “from” unit) ÷ (seconds in the “to” unit)
- 1 day
- 86,400 seconds
- average month
- 30.44 days
- average year
- 365.2425 days
Worked example
One year
- 1 average year = 365.2425 days.
- = 8,765.82 hours.
- = 5,25,949 minutes.
What the result means
Use the date difference calculator for exact days between two dates.
Assumptions
- Average month and year lengths.
Limitations
- Specific months and years differ (28 to 31 days; 365 or 366 days).
Frequently asked questions
How many hours in a year?
8,760 in a 365-day year; 8,765.82 on average including leap years.
How many seconds in a day?
86,400.
How many weeks in a year?
52 weeks and 1 or 2 days.
Last reviewed on 3 October 2026. Found a mistake? Tell us.