Date & Time Tools
Seconds Converter
Convert seconds to minutes, hours, days, weeks, months, and years in your browser. Also outputs HH:MM:SS and a human readable breakdown.
Seconds converter
Quick conversions
Accepts decimals, scientific notation (1e6), and thousand separators.
From unit
Sub-second
Nanoseconds, microseconds, milliseconds
Core
Seconds, minutes, hours, days, weeks
Calendar
Average months and Julian years
Decimal places
Summary
HH:MM:SS
01:00:00
Clock format. Useful for timers, video lengths, payroll.
Human readable
1 hour
Largest non-zero units, written in plain English.
Total seconds
3600
Canonical value. Multiply by 1000 to get JavaScript ms.
Sub-second results
Used in code timing, network latency, and animation frames.
Converted
Nanoseconds
3600000000000 ns
1 ns = 0.000000001 s. Used in CPU and signal timing.
Converted
Microseconds
3600000000 us
1 us = 0.000001 s. Used in high resolution timers.
Converted
Milliseconds
3600000 ms
1 ms = 0.001 s. JavaScript Date and most APIs use ms.
Core results
Seconds to weeks. Each row is the same duration in a different unit.
Source
Seconds
3600 s
Base SI unit. Unix timestamps count seconds from 1970-01-01 UTC.
Converted
Minutes
60 min
1 min = 60 s.
Converted
Hours
1 h
1 h = 60 min = 3600 s.
Converted
Days
0.0417 d
1 d = 24 h = 86400 s.
Converted
Weeks
0.006 wk
1 wk = 7 d = 604800 s.
Calendar results
Average month (30.44 d) and Julian year (365.25 d). For exact dates, use a date difference calculator.
Converted
Months (average)
0.0014 mo
Average calendar month: 30.4375 d. Actual months vary 28 to 31 days.
Converted
Years (Julian)
0.0001 yr
Julian year: 365.25 d. Accounts for leap years on average.
Common time values, in plain numbers
- 1 minute is 60 seconds. 1 hour is 60 minutes, or 3,600 seconds.
- 1 day is 24 hours, or 86,400 seconds. 1 week is 7 days, or 604,800 seconds.
- 1 month (average) is 30.4375 days, or about 2,629,800 seconds. Actual calendar months range from 28 to 31 days.
- 1 year (Julian) is 365.25 days, or 31,557,600 seconds. The extra quarter-day accounts for leap years on average.
- 1 millisecond is 0.001 seconds, and 1,000 milliseconds equal 1 second. The Date.now() function in JavaScript returns Unix time in milliseconds.
Reference durations
Tap any row to load it as seconds. All units update instantly.
How to use
- Type or paste a number into the Value to convert field. Decimals, scientific notation, and thousand separators are all accepted.
- Pick the source unit (nanoseconds through years). The same duration is shown in every other unit instantly.
- Read the Summary panel for the HH:MM:SS clock string, the human readable breakdown, and the canonical total in seconds.
- Pick a decimal precision (0, 2, 4, or 6 places). Click any Copy button to copy a single result.
- Use the Quick conversions and Reference durations rows to load common values with one click.
About this tool
Seconds Converter turns any number of seconds (or milliseconds, microseconds, nanoseconds, minutes, hours, days, weeks, average months, or Julian years) into every other common time unit, all at once. Type a value, pick the source unit, and the tool returns the equivalent duration in nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, months, and years. A Summary panel adds two more outputs that come up constantly: an HH:MM:SS clock string (so 3,600 seconds reads as 01:00:00 and 86,400 seconds reads as 24:00:00), and a plain-English breakdown such as '1 day, 2 hours, 3 minutes, 45 seconds'. The math runs in canonical seconds with double-precision floating point, accepts decimals and scientific notation, and switches to exponential form when the result is too small to render usefully as a fixed decimal. Calendar units use the conventional astronomical averages so the conversions round-trip cleanly: 1 year is the Julian year (365.25 days) and 1 month is one twelfth of that (about 30.4375 days). For exact calendar dates, the page links to a date difference calculator. Quick-conversion buttons cover the high-volume queries (60, 300, 3,600, 86,400, 604,800 seconds), and a reference card lets you tap a familiar duration (work day, work week, Pomodoro block, decade) to load it as seconds. Everything runs in your browser, so values you convert never leave your device.
Free to use. Works in your browser. No signup, no login.
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