Time Converter

Convert time between milliseconds, seconds, minutes, hours, days, weeks, months, and years. Calculates in your browser.

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About time conversions

Enter a value and choose the units to convert between. Each time unit is defined against a single base unit, so any pair lines up consistently, the table shows your value in every time unit at once.

What this does

A time converter changes a duration between milliseconds, seconds, minutes, hours, days, weeks, months, and years.

How to use it

  1. Enter a value and pick its unit.
  2. Choose the unit to convert to.
  3. Read the converted result instantly.
  4. Use exact dates for precise calendar spans.

How it works

Each value is converted to seconds first and then to the target unit. For quick estimates a month is treated as 30 days and a year as 365 days; real calendar months and leap years vary.

1 hour = 3,600 seconds

Example

One day is 86,400 seconds, and one week is 604,800 seconds. 90 minutes is 1.5 hours.

Sources & methodology

Last updated .

Frequently asked questions

How long is a month or year here?

For quick estimates a month is treated as 30 days and a year as 365 days. Calendar months and leap years vary, so use exact dates for precise spans.

How many seconds are in an hour?

There are 3,600 seconds in an hour and 86,400 seconds in a day.

Is my data stored?

No. Everything is calculated locally in your browser.