Convert between years, months, days, hours, and more with real-time updates.
Edit any field to instantly update every other unit.
Summarize the total time in a human-friendly breakdown.
Enter a value to see the breakdown.
The Time Unit Converter is a free, browser-based tool that converts a value between years, months, weeks, days, hours, minutes, seconds, and milliseconds in real time. Everything runs entirely in your browser, so the values you enter never leave your device.
It is built for anyone who needs to translate one time unit into others quickly, such as developers checking a duration in milliseconds, students working through unit conversions, or anyone turning hours into days. Edit any single field and every other unit updates instantly.
Below the converter, the Smart Duration section breaks a total time down into a readable mix of years, months, days, hours, minutes, and seconds. You can also paste a date, a date-time, or a duration phrase like "2h 30m" or "1 year 6 months", and the tool will fill in the fields for you. A copy button next to each field puts that value on your clipboard.
Month and year conversions use average duration lengths rather than a specific calendar, so results around those units are approximate and may not match an exact date difference. There are no accounts, logins, or server calls; the page works offline once loaded.