Time & Duration Converter
Convert nanoseconds (ns), microseconds (μs), milliseconds (ms), seconds (s), minutes (min), hours (h), days, weeks, fortnights, months (30 d), years (365 d) and decades.
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About This Converter
This time and duration converter spans 12 units from nanoseconds up to decades, using the SI second as its base. Months are treated as a fixed 30 days and years as 365 days for consistent, repeatable results. It is especially handy for developers benchmarking code in milliseconds or microseconds, project managers converting weeks to working days, or students solving physics problems that mix hours, seconds, and minutes.
FAQ
Why do you use 30-day months and 365-day years?
They're convenient fixed definitions for quick math. Calendar months vary (28–31 days) and years have leap days; using fixed values keeps results consistent across conversions.
What is a fortnight?
A fortnight is 14 days. It's common in some countries for scheduling or pay periods.
How accurate are sub-second units?
ms = 10⁻³ s, μs = 10⁻⁶ s, ns = 10⁻⁹ s. We convert exactly; very large/small values may display in scientific notation for readability.
Tips for using this converter
Select the unit first (e.g., hours), enter your number once, and all tiles update instantly. Press Enter on mobile to hide the keyboard.