Time Unit Converter

How to use

1. 1Type a value in the convert box and choose the unit it is in, for example 90 minutes.
2. 2Read the same amount of time shown in every other unit, from milliseconds to years.
3. 3Check the human readable line for a plain breakdown like 1 day, 3 hours, 46 minutes.
4. 4For one focused conversion, use the lower panel: enter a value, pick a from unit and a to unit, and press Swap to reverse it.
5. 5Copy any result with its copy button. Units marked approx use average month and year lengths.

About this tool

Time Unit Converter changes a single time value between every common unit, from nanoseconds up through centuries. It answers the questions people search for constantly, such as how many seconds are in a minute, how many minutes are in a day, how many hours are in a year, or simply how to turn 90 minutes into hours, 1500 milliseconds into seconds, or 6 months into days. The tool does two distinct jobs. The first is a convert all board: type one number, pick the unit it is in, and read it expressed in nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years, decades, and centuries at the same time, each with its own copy button. Below that it also shows a human readable breakdown, so a duration becomes something like 1 day, 3 hours, 46 minutes, 40 seconds. The second job is a precise unit to unit converter where you choose a source unit and a target unit for one focused conversion, with a swap button to reverse the direction instantly. Every conversion runs through seconds as a shared base, so the results stay consistent no matter which pairing you pick. The fixed units are exact: 1 minute is 60 seconds, 1 hour is 3,600 seconds, 1 day is 86,400 seconds, and 1 week is 7 days. Months and years are not fixed lengths, so like any unit converter this tool uses calendar averages, a month of 30.436875 days and a year of 365.2425 days, which come from the Gregorian mean year. Any result that depends on those averages is clearly marked as approximate so you are never misled. Because days are treated as a flat 24 hours, daylight saving time shifts are not applied; for the exact gap between two real calendar dates a date difference tool is the better choice, and the related tools cover that. Inputs accept a comma or a period as the decimal separator, handle thousands grouping like 1,000, and accept scientific notation such as 1.5e3. Very large or very small results switch to scientific notation rather than rounding away to zero, so a nanosecond still reads as 1e-9 seconds. Everything is computed locally in your browser. The numbers you type are never uploaded, never stored on a server, and disappear when you close the tab.

Free to use. Works in your browser. No signup, no login.