About the Time Converter
Time Converter changes a length of time between milliseconds, seconds, minutes, hours, days, weeks, months, years and decades. Enter a number and a unit and every other unit appears. It is useful for project estimates, video and audio lengths, study plans, shift planning and homework. Months and years are average lengths (30.4375 days and 365.25 days), so for exact dates use the Date Calculator or Days Between Dates instead.
Updated October 2026
How to use the Time Converter
- 1Type the a time span you want to convert.
- 2Choose the unit it is in from the From unit list.
- 3Read the result in every other unit straight away.
- 4Press Copy to keep the answer, or change the number to try another.
When you need a a time span converter
Time Converter changes a length of time between milliseconds, seconds, minutes, hours, days, weeks, months, years and decades. Time units are not all fixed in the same way. A minute, an hour, a day and a week always have the same length, but a month and a year do not: months are 28 to 31 days and years are 365 or 366. This page uses averages for them, which is right for planning and for rough sums.
Units and what they mean
If you need the number of days between two real dates, or the date that is 90 days from now, a date tool is the right choice, because it counts the real calendar. Use this converter when you only need to change the unit of a length of time, such as 2.5 hours into minutes or 10,000 hours into years.
- Second, minute, hour: 60 seconds per minute and 60 minutes per hour
- Day and week: 24 hours and 7 days
- Month: an average of 30.4375 days (a real month is 28 to 31 days)
- Year: 365.25 days on average, including leap years
Tips for accurate results
Useful anchors: a day has 86,400 seconds, a week 10,080 minutes, and a 365 day year 8,760 hours. A 40 hour working week over 52 weeks is 2,080 hours.
Round only at the end of a calculation. If you convert and then convert again, keep the full number in between so small errors do not add up.
Related conversions
For clock times written as hh:mm:ss use the Seconds to Time Converter, and to add or subtract times use the Time Calculator. Related tools: Seconds to Time Converter, Time Calculator, Days Between Dates, Date Calculator and Speed Converter.
Features
- 9 units in one list
- Every result shown at once
- Exact factors, no rounding until you read it
- Works with decimals and negative-free values
- Copy button for the answer
- Calculated in your browser, so nothing is uploaded.
Frequently asked questions
How do I convert a time span?
Type the number, pick the unit you start with and read the answer in every other unit below. Each unit is stored as an exact factor of one base unit, so a result is the number times its factor divided by the target unit's factor.
How many minutes are in a day?
1,440 minutes (24 hours times 60).
How many seconds are in a year?
31,536,000 for a 365 day year, and about 31,557,600 on average with leap years. This page uses the average.
Why is the month result not whole?
A month is not a fixed length, so the page uses the average of 30.4375 days.
Is the result exact?
The factors used are the official or standard definitions, so the maths is exact. The page rounds what it shows to about 10 significant digits so numbers stay readable.
Does it work on my phone?
Yes. The page is built for small screens, with large inputs and a list of units you can scroll.
Is anything sent to a server?
No. The conversion is plain arithmetic in your browser, so nothing you type leaves your device.