Time Converter
Convert time between milliseconds, seconds, minutes, hours, days, weeks, months and years. Type a value and see it in every unit at once. A free, instant time converter that runs in your browser, with no sign-up.
Work out a length of time in a different unit without counting on your fingers. Convert seconds to milliseconds for a timer, days to hours for a schedule, or weeks to days for a plan, and see every unit at once. It covers milliseconds right up to years, both ways.
- Exact, standard factors
- 100% free
- No sign-up, no app
- Instant as you type
- Works offline after first load
1 h in every unit
How to use it
- 1
Enter a duration
Type the length of time you have, such as 90 minutes or 3 days.
- 2
Choose the units
Set what you are converting from and to, then swap to reverse it.
- 3
Read the rest
See milliseconds, seconds, minutes, hours, days, weeks and years together, and copy any line.
When it comes in handy
Planning and scheduling
Work out how many hours are in a number of days, or how many weeks make up a period in days.
Coding and timeouts
Convert seconds to milliseconds for a timer or timeout, or the other way for a log.
Everyday maths
Answer a quick question like how many minutes are in a day or seconds in an hour.
Instant, exact & 100% in your browser
The conversion runs right here in your browser using exact, standard factors. Nothing you type is sent to a server, there is no sign-up and no limit, and once the page has loaded it keeps working even with no connection.
Frequently asked questions
- How long is a month in this converter?
- A month here is the average length across a year, about 30.44 days, because months vary from 28 to 31 days. That makes month and year conversions consistent rather than tied to one particular calendar month. For a specific month, use its actual number of days.
- How many seconds are in a day?
- There are 86,400 seconds in a day: 24 hours times 60 minutes times 60 seconds. From there, a week is 604,800 seconds, which is why these conversions are exact whole numbers up to the day and week.
- How many milliseconds are in a second?
- One second is 1,000 milliseconds, and a millisecond is a thousandth of a second. Programmers reach for this a lot, because timers, timeouts and timestamps in code are usually measured in milliseconds while people think in seconds.
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