Time Unit Converter Online – Free & Private
Convert any value between time units — years, days, hours, minutes, and seconds, all the way down to milliseconds, nanoseconds, and yoctoseconds. Time Shuttle runs entirely in your browser, so your data stays private and never touches a server.
From Years to Yoctoseconds
The second is the SI base unit of time, and every other unit is defined relative to it. Larger units group seconds into the familiar calendar quantities — minutes, hours, days, weeks, months, and years — while smaller units divide the second using SI prefixes, each a factor of one thousand apart.
Time Shuttle converts a single value into every one of these units at once, so you never have to chain conversions or remember the factors. Enter a number, pick its unit, and read the result across the whole range.
How to Convert Time Units
- Open the Units tab: On the Time Shuttle home page, switch to the Units tab. No installation or account is needed.
- Enter a value: Type the number you want to convert.
- Choose the source unit: Select the unit your value is in — seconds, days, years, nanoseconds, and so on.
- Read every unit: The tool instantly shows the value in every time unit, each with a one-click copy button.
Supported Units & Conversion Factors
- Year: 365.25 days = 31,557,600 seconds (Julian year).
- Month: one twelfth of a year ≈ 30.44 days.
- Week: 7 days = 604,800 seconds.
- Day: 24 hours = 86,400 seconds.
- Hour: 60 minutes = 3,600 seconds.
- Minute: 60 seconds.
- Second: the SI base unit.
- Millisecond (ms): 10⁻³ s — one thousandth of a second.
- Microsecond (µs): 10⁻⁶ s.
- Nanosecond (ns): 10⁻⁹ s — one billionth of a second.
- Picosecond (ps): 10⁻¹² s.
- Femtosecond (fs): 10⁻¹⁵ s.
- Attosecond (as): 10⁻¹⁸ s.
- Zeptosecond (zs): 10⁻²¹ s.
- Yoctosecond (ys): 10⁻²⁴ s — the smallest named SI sub-second unit.
Common Conversions
1 day = 24 hours = 1,440 minutes = 86,400 seconds = 86,400,000 milliseconds.
1 hour = 60 minutes = 3,600 seconds = 3,600,000 milliseconds.
1 second = 1,000 ms = 1,000,000 µs = 1,000,000,000 ns.
1 year (365.25 days) = 31,557,600 seconds ≈ 3.156 × 10¹⁶ nanoseconds.
Why Use Time Shuttle?
Most online unit converters either cover only the common units (seconds to days) or send your input to a server. Time Shuttle does neither: it spans the full range from years down to yoctoseconds, and every calculation happens locally in your browser using plain JavaScript. Nothing you type ever leaves your device.
For very large or very small results, values are shown in clean scientific notation so the answer stays readable even across more than fifty orders of magnitude.