Time Converter

Time conversion uses fixed relationships between units. For example, one minute contains 60 seconds, one hour contains 60 minutes, and one day contains 24 hours.

Smaller units are useful when measuring short intervals, such as processing time or system response. Larger units make it easier to compare longer durations, such as weeks, years, or centuries.

The converter calculates equivalent durations using these relationships. Results update as you enter a value, and you can choose the number of decimal places shown.

Convert time units online with this free Time Converter. Enter a duration and get its equivalent in other units, from nanoseconds and microseconds to days, weeks, average months, years, decades, and centuries.

The converter is useful for comparing elapsed durations, checking calculations, and working with time values in everyday, scientific, or technical contexts.

Choose from these supported units:

Nanoseconds (ns): Very short durations, often used in computing and electronics.

Microseconds (µs): One millionth of a second, used in technical measurements.

Milliseconds (ms): One thousandth of a second, common in software timing and response measurements.

Seconds (s): A standard unit for measuring short and everyday durations.

Minutes (min): 60 seconds.

Hours (h): 60 minutes.

Days (d): 24 hours.

Weeks (wk): 7 days.

Average months: A fixed duration of 30.4375 days.

Average years: A fixed duration of 365.25 days.

Decades: 10 average years.

Centuries: 100 average years.

Months do not all have the same number of days. Calendar months can contain 28, 29, 30, or 31 days, depending on the month and year.

For consistent duration conversions, this tool uses fixed averages:

1 average month = 30.4375 days

1 average year = 365.25 days

1 decade = 10 average years

1 century = 100 average years

These are duration approximations, not calendar calculations. For example, converting a date to the date one month later requires calendar arithmetic. It cannot be determined accurately by simply adding 30.4375 days in every situation.

Here are some useful reference conversions:

A few smaller-unit examples:

1 millisecond = 1,000 microseconds.

1 microsecond = 1,000 nanoseconds.

1 second = 1,000 milliseconds.

For longer durations, 2 weeks equal 14 days, while 2 average years equal 730.5 days.

Enter the duration you want to convert.

Select the starting unit.

Choose the unit you want to convert to, or review the equivalent values in other units.

Use the swap control to exchange the selected units.

Select the decimal precision you need.

Copy an equivalent value when you want to use it elsewhere.

The conversion updates as you change the input. You can adjust the precision to show more or fewer decimal places, depending on whether you need a quick estimate or a more detailed result.

A time converter can be useful for:

Converting milliseconds and microseconds when reviewing software performance measurements.

Changing seconds into minutes or hours.

Comparing durations measured in days and weeks.

Converting average months and years for duration estimates.

Checking unit relationships in science, education, and technical calculations.