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Time Duration Converter
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// about this tool

Time Duration Converter Online

Updated 2026-07-09

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

No. The conversion runs entirely in your browser, so nothing you enter leaves your machine.
Seconds, minutes, hours, days, weeks, months, and years, with conversion in any direction.
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.
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.
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.

// related

Unix Timestamp Converter Speed Converter Cron Expression Parser Number to Words Length Converter

Use this via API

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