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Time Duration Converter
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// about this tool

Time Duration Converter Online

Updated 2026-08-19

Convert time durations online for free between seconds, minutes, hours, days, weeks, months, and years. Enter a value, pick the units, and SnapTools shows the result instantly. Everything runs in your browser, so nothing you enter is uploaded.

How many seconds are in a day? How many hours in three weeks? Duration math is easy to get wrong by a factor when you are converting timeouts, estimating project spans, or setting intervals. This converter handles every pairing in one step, using a 365.25-day year to average out leap years. For converting a timestamp to an actual calendar date, reach for the Timestamp Converter instead.

// how to use

  1. 1 Enter a duration value in the input panel.
  2. 2 Choose the unit you're converting from and the unit you're converting to.
  3. 3 Read the converted value on the right, then copy it.

// examples

Hours to minutes
Input
2 h → min
Output
120 min
Days to hours
Input
3 d → h
Output
72 h
Seconds to days
Input
86400 s → d
Output
1 d

// common uses

Converting task or process durations between units Estimating timeouts and intervals in seconds Working out how many hours a project spans Comparing durations expressed in different units

// faq

Is my input uploaded to a server?
No. The conversion runs entirely in your browser, so nothing you enter leaves your machine.
Which time units are supported?
Seconds, minutes, hours, days, weeks, months, and years, with conversion in any direction.
How are months and years defined?
A year is treated as 365.25 days (accounting for leap years on average) and a month as one twelfth of that. These are standard averages, since calendar months vary in length.
Is this for durations or calendar dates?
This converts lengths of time, such as "how many minutes in 3 hours". To convert between a Unix timestamp and a calendar date, use the Timestamp Converter instead.
How precise are the results?
Conversions are computed at full floating-point precision and rounded for display, so they are accurate for scheduling, estimating, and back-of-the-envelope math.

// works with your data

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Use this via API

Get a free API key → 
curl -X POST https://thesnaptools.com/api/v1/tools/time-duration-converter \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"value":"2 h \u2192 min"}'