Time Converter
Convert between different units of time measurement including nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years, decades, centuries, and more. Quick and accurate time conversions.
Conversion Settings
No value entered
Conversion Result
Conversion result will appear here
Enter a value and click "Convert" to start
About Time Converter
A time converter is a comprehensive utility that transforms time values between different units of measurement, from the smallest nanoseconds to the largest centuries. This versatile tool handles precise conversions across all time scales including microseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years, and decades with mathematical accuracy.
Why use a Time Converter?
Time conversions are essential in scientific calculations, programming, project planning, and everyday problem-solving, but manual calculations are prone to errors and time-consuming. This tool provides accurate conversions between any time units, eliminating calculation mistakes and saving valuable time in technical work, research, and planning activities.
Who is it for?
This tool serves scientists, engineers, programmers, project managers, students, researchers, and professionals in fields requiring precise time measurements. It's particularly useful for those working with performance metrics, scientific experiments, scheduling applications, data analysis, or anyone needing quick and reliable time unit conversions.
How to use the tool
Enter the time value you want to convert in the input field
Select the source time unit from the dropdown menu (nanoseconds, seconds, hours, etc.)
Choose the target time unit you want to convert to from the destination dropdown
View the converted result (up to 12 significant digits)
Copy the converted value for use in your calculations, code, or documentation
Frequently Asked Questions
How do I convert time units?
Enter the source value, pick the 'from' and 'to' units, and click Convert to see the result. Supports ns, μs, ms, s, min, h, day, week, month (30 days), year (365 days), decade, century, and more. Copy the converted value to clipboard. Conversion runs entirely in your browser — values never leave the device. Results are shown to up to 12 significant digits with trailing zeros removed; there is no precision setting.
What time units does this converter support?
ns, μs, ms, s, min, h, day, week, month (30 days), year (365 days), decade, century, and more. The set covers SI base and derived units, common imperial/US-customary units, and domain-specific units where relevant. SI prefixes (k, M, G, m, μ, n) apply where applicable. For any unit not in the list that you need converted, mention it via feedback — the unit set evolves based on user requests.
How accurate is the time conversion?
Conversions use the internationally-defined factors where they exist; the result is rounded to 12 significant digits for display. SI base unit is the second (defined since 1967 by atomic clock — caesium-133 atom transition). All sub-second units (ns, μs, ms) use standard SI prefixes. For calendar arithmetic, use a date library; for date/timezone conversion, use [Epoch Converter](/tools/epoch-converter/). Output is rounded to 12 significant digits for display, and there is no setting to change that.
What's the formula to convert minutes to seconds?
s = min × 60. Project planning (converting minutes ↔ hours ↔ days for time estimates), performance benchmarks (microseconds ↔ milliseconds), historical durations (years ↔ days). For other time-unit pairs, the tool applies the appropriate exact conversion factor automatically — no manual formula needed. Results are rounded to 12 significant digits, which is more than engineering specs typically need.
What's the key accuracy caveat for time conversion?
**'Month' and 'year' are approximate** — calendar months vary (28-31 days), and calendar years vary (365 or 366 days). This tool uses fixed values: 1 month = 30 days and 1 year = 365 days (separate Julian-year, Gregorian-year, leap-year, sidereal and tropical-year units are also available). For exact calendar arithmetic (e.g. 'add 1 month to 2026-01-31'), use a date library — calendar months are not fixed-duration. For physics or engineering, use seconds (SI) and avoid the ambiguity.
What's a common real-world use case for time conversion?
Project planning (converting minutes ↔ hours ↔ days for time estimates), performance benchmarks (microseconds ↔ milliseconds), historical durations (years ↔ days).
What time units are commonly confused?
**'Month'** — calendar month varies (28-31 days); this tool's month is 30 days. **'Year'** — calendar year is 365 or 366 days; this tool's year is 365 days. **'Day'** — exactly 86,400 seconds in this tool (no leap seconds).
How do I handle very large or very small time values?
Use SI prefixes for clean scaling: kilo (10³), mega (10⁶), giga (10⁹), milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹). For very large or very small results, the tool switches to exponent notation (e.g. 1.23e15) at 1e15 and above or below 1e-9. SI base unit is the second (defined since 1967 by atomic clock — caesium-133 atom transition). All sub-second units (ns, μs, ms) use standard SI prefixes. For calendar arithmetic, use a date library; for date/timezone conversion, use [Epoch Converter](/tools/epoch-converter/). For data interchange, copy the value; it is shown to 12 significant digits.
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