Time Converter
Convert between all 8 time units — Millisecond, Second, Minute, Hour, Day, Week, Month, Year — with instant results, formulas and worked examples.
A single converter for every time unit on ConvertWorks. Pick any two units, type a value, and get an instant, accurate result — no page reloads and nothing leaves your browser. Dedicated pages for the most popular pairs are linked below.
Quick reference — Milliseconds to Seconds
Every unit above is defined relative to the seconds: pick any pair and the converter divides the two base factors, so results stay consistent across the whole category.
How to use this calculator
- Choose the unit you have in the From dropdown.
- Choose the unit you want in the To dropdown.
- Type your value — the result updates instantly.
- Use Swap to reverse the conversion, or open a dedicated pair page below for one specific conversion.
The formula
Result = Value × (from-unit factor ÷ to-unit factor), with all factors relative to the seconds.
Worked example
90 min = 1.5 h — in full, 90 Minutes converts to 1.5 Hours. Timers, schedules and project estimates are the everyday jobs for this conversion.
Frequently Asked Questions
What units does this time converter include?
It covers Millisecond, Second, Minute, Hour, Day, Week, Month, Year — 8 units in total. Every conversion runs through the seconds as the common reference, so any pair you pick stays consistent with every other pair.
How does this time converter work?
Each unit is defined by an exact factor relative to the seconds. To convert, the tool multiplies your value by the from-unit's factor and divides by the to-unit's factor, then rounds the display to six significant figures.
How accurate are the results?
The factors come from the official definitions of the units (for example, 1 inch is exactly 0.0254 meters and 1 pound is exactly 0.45359237 kilograms), so conversions are as accurate as the definitions themselves. Display rounding to six significant figures can hide trailing digits on extreme values.
Can I convert Minutes to Hours with this tool?
Yes — select Minutes and Hours in the dropdowns. For example, 90 Minutes equals 1.5 Hours, and the dedicated pair page linked below focuses on just that conversion.
How long is a month or a year in this converter?
This converter uses the common averages: a year is 365 days and a month is one twelfth of a year (about 30.42 days). Real calendar months vary from 28 to 31 days, so for exact calendar spans use a date-difference calculation instead.