Free Time Converter – Convert Time Units Online
Convert between seconds, minutes, hours, days, weeks, months and years.
About the Time Converter
What is the Time Converter?
A time converter changes a duration between tiny and huge units, from nanoseconds to centuries.
Why use this calculator?
Programming timeouts, project planning and science all express time in different scales, so a converter saves manual arithmetic.
How to use it
- Enter the time value.
- Choose the source and target units.
- Read the converted duration.
Formula
Every unit is defined relative to the second.
A month uses the average length of 30.44 days and a year uses 365.25 days, so calendar-exact conversions may differ slightly.
Frequently Asked Questions
Why is a month not a fixed number of days?
Calendar months range from 28 to 31 days, so converters use an average month of about 30.44 days.
How many seconds are in a day?
There are 86,400 seconds in a day (24 × 60 × 60).
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.