Time Unit Converter

Free Time Unit Converter — convert between seconds, minutes, hours, days, weeks, months and years instantly with all-units output.

869.6K uses Updated · 2026-05-12 Runs locally · zero upload
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How to Use Time Unit Converter

The Time Unit Converter is a one-stop utility for switching between every common time unit at once.

  1. Enter a value — Any positive number including decimals.
  2. Pick the source unit — Seconds, minutes, hours, days, weeks, months, years.
  3. Read all seven results — The converted value plus equivalents in every other unit.
  4. Use the result — For scheduling, science, history, or planning.

Formula & Theory - Time Unit Converter

Conversion factors (relative to seconds):

1 minute = 60 s
1 hour   = 3,600 s
1 day    = 86,400 s
1 week   = 604,800 s
1 month  ≈ 2,629,746 s (avg 30.44 days)
1 year   ≈ 31,556,952 s (avg 365.24 days)
UnitSeconds
Second1
Minute60
Hour3,600
Day86,400
Week604,800
Month (avg)2,629,746
Year (avg)31,556,952

Approximate vs. Exact

Months and years vary in length. The Time Unit Converter uses long-term averages so conversions are smooth but not calendar-precise. For exact dates (birthdays, contract terms), use a dedicated date calculator.

Use Cases for Time Unit Converter

The Time Unit Converter is essential for:

  • Scheduling and planning — Translate a project duration in weeks into days and hours.
  • Science and engineering — Convert observation periods, half-lives or experiment durations.
  • History and geology — Express geological events in years or weeks.
  • Software & systems — Convert TTL or session timeouts between seconds and hours.
  • Health and fitness — Translate workout cumulative time across multiple units.
  • Education — Help students grasp the relationships between time units.

The Time Unit Converter consolidates seven units into one easy interface, so you never have to chain conversions manually.

Frequently asked questions about Time Unit Converter

Which time units does the calculator support?

Seconds, minutes, hours, days, weeks, months and years. The Time Unit Converter shows all seven units in a single result panel.

How is one month defined?

Month uses the average length of 30.44 days (365.24 / 12). The Time Unit Converter is for approximate conversion - exact calendar dates require a separate date calculator.

How is one year defined?

Year uses 365.24 days, the long-term average accounting for leap years. This is suitable for general-purpose conversion but not for exact calendar math.

Can I enter decimals like 1.5 hours?

Yes. Any non-negative decimal value is supported.

Is my data stored?

No. Everything runs locally in your browser.