Time Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, months, years, decades, and centuries.
Result
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All conversions
What is Time Converter?
A time converter lets you convert durations between units ranging from milliseconds to centuries. Time conversions are useful in project planning (hours to days), software development (milliseconds to seconds), historical calculations (years to decades), and scientific work. Unlike most units, months and years have variable lengths, so this converter uses average values.
How to use
- 1 Enter the time duration value in the Value field.
- 2 Select the source unit (for example, hours) in the From dropdown.
- 3 Select the target unit (for example, days) in the To dropdown.
- 4 The converted result and a full comparison table appear instantly.
- 5 Use the swap button to reverse the conversion direction.
Formula
Example calculation
To convert 48 hours to days: 48 hours × 3600 s/hr = 172800 s, then 172800 s / 86400 s/day = 2 days. To express 2 days in minutes: 172800 s / 60 s/min = 2880 minutes.
Frequently asked questions
How many seconds are in a day?
There are 86,400 seconds in a day (24 hours × 60 minutes × 60 seconds). Leap seconds are occasionally added to atomic time but are not reflected in everyday calculations.
How many days are in a year?
A calendar year has 365 days, or 366 in a leap year. This converter uses the average Julian year of 365.25 days (31,557,600 seconds) to account for leap years over time.
How many weeks are in a month?
An average month (using 30.44 days) contains approximately 4.35 weeks. Calendar months range from 28 to 31 days, so the exact value varies.
What is a millisecond used for?
Milliseconds (one thousandth of a second) are used in computing, networking (ping/latency), sports timing, and audio production. Human reaction time is typically 150 to 300 milliseconds.
How long is a decade vs a century?
A decade is 10 years (315,576,000 seconds using 365.25-day years). A century is 100 years, or 3,155,760,000 seconds. A millennium is 1000 years.