8 units · 56 conversions

Time Converter

Convert seconds, minutes, hours, days, weeks and years.

Popular Time conversions

Seconds to Milliseconds s → ms Seconds to Minutes s → min Seconds to Hours s → h Seconds to Days s → d Seconds to Weeks s → wk Seconds to Months s → mo Seconds to Years s → yr Milliseconds to Seconds ms → s Milliseconds to Minutes ms → min Milliseconds to Hours ms → h Milliseconds to Days ms → d Milliseconds to Weeks ms → wk Milliseconds to Months ms → mo Milliseconds to Years ms → yr Minutes to Seconds min → s Minutes to Milliseconds min → ms Minutes to Hours min → h Minutes to Days min → d Minutes to Weeks min → wk Minutes to Months min → mo Minutes to Years min → yr Hours to Seconds h → s Hours to Milliseconds h → ms Hours to Minutes h → min Hours to Days h → d Hours to Weeks h → wk Hours to Months h → mo Hours to Years h → yr Days to Seconds d → s Days to Milliseconds d → ms

All Time conversions (56)

All Time units

Seconds s Milliseconds ms Minutes min Hours h Days d Weeks wk Months mo Years yr

About Time

Time covers eight units spanning the whole range people work with: milliseconds and seconds at the short end, then minutes, hours, days, weeks, months and years. The reasons people convert them are everywhere. Developers read a timeout or a benchmark in milliseconds and want it in seconds. Project managers turn hours into days or weeks. Contracts and subscriptions quote months while budgets run in weeks. Anyone estimating a long-running task turns seconds into hours to see whether it will finish before they go home. The most used pages here are minutes to hours, seconds to minutes, hours to days and milliseconds to seconds.

Time is the least tidy category on the site, and it is worth knowing why. Most measurement systems are built on consistent steps, but the calendar is not. Milliseconds, seconds, minutes, hours, days and weeks all relate to each other by fixed, exact amounts, so converting between them is reliable and reversible. Months and years are different. A month is not a fixed length: it varies from 28 to 31 days depending which one you mean, and a year picks up an extra day in leap years. Any converter that turns months or years into days has to use an average length, because there is no single true answer. That means results involving months and years are excellent for estimating durations, planning and rough budgeting, but they are not the right tool for calendar arithmetic where the exact dates matter. If you need to know precisely how many days sit between two real dates, count the actual calendar rather than multiplying an average. Everything below the day is exact, so a conversion from milliseconds up to hours has no such caveat.

Each pair page shows the formula it used, walks a worked example through, and includes a reference table of common durations, which is often all you need. Every page is free, none needs an account or a sign-up, and the arithmetic runs in your own browser so nothing you enter is transmitted. If you are converting a duration in order to work out a rate or a transfer time, the digital storage converter is the natural companion.

Frequently asked questions

How many days does this converter use for a month?

It uses an average month length, because real months are not all the same size. They range from 28 to 31 days, so there is no single correct number to convert with. The average gives you a sound estimate for planning, durations and budgeting. For anything where the exact calendar matters, such as counting the days between two specific dates, work from the actual calendar rather than an average.

Are the year conversions affected by leap years?

Yes, indirectly. A calendar year is usually 365 days but gains one in a leap year, so the converter uses an average year length rather than pretending every year is identical. That is accurate enough for estimating spans and durations, and the difference only becomes visible over long periods or when precise dates are involved. For exact date arithmetic, count the real calendar.

Which time conversions are exact?

Everything from milliseconds through to weeks. Milliseconds, seconds, minutes, hours, days and weeks all relate by fixed, exact amounts, so those conversions are precise and fully reversible: convert one way and back and you land on the same number. Only months and years rely on averages, because the calendar itself is irregular.

Why would I convert milliseconds to seconds?

It comes up constantly in software. Timeouts, animation durations, API latency figures and benchmark results are usually reported in milliseconds because that is the resolution the system works at, but people think in seconds. Converting makes a figure like a page load time or a request duration immediately meaningful. The milliseconds to seconds page and its reverse handle it in either direction.

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