Explanation
Fixed units of elapsed time
Convert an elapsed time between milliseconds, seconds, minutes, hours, days and weeks. Every unit here is a fixed number of seconds, so the conversion is one exact factor.
y = x × k
| x | value in the unit you convert from |
|---|---|
| k | conversion factor: seconds per source unit ÷ seconds per target unit |
| y | value in the unit you convert to |
1 hour to minutes
| Value | 1 |
|---|---|
| From | Hours (h) |
| To | Minutes (min) |
| Result | 60 min |
1 h = 60 min
2 days to hours
| Value | 2 |
|---|---|
| From | Days (d) |
| To | Hours (h) |
| Result | 48 h |
2 d = 48 h
1,500 milliseconds to seconds
| Value | 1,500 |
|---|---|
| From | Milliseconds (ms) |
| To | Seconds (s) |
| Result | 1.5 s |
1,500 ms = 1.5 s
Diagram of this result
The marker shows the entered duration on a scale in the source unit; the scale below it is drawn in the target unit, so the reading under the marker is the answer.
The answer and the steps state both values with their unit symbols.
Definitions and limits
A minute is 60 s, an hour 3,600 s, a day 86,400 s and a week 604,800 s. Months and years are left out because their length varies. Answers are shown to six significant figures; the calculation keeps every digit.
Common mistakes
Hours are not decimal clock time: 1.5 h is 1 hour 30 minutes, not 1 hour 50 minutes. A calendar day that crosses a daylight-saving change can last 23 or 25 hours; this converter always uses 24.
How many hours is 90 minutes?
1.5 hours, that is one hour and thirty minutes. Two days are 48 hours, and 1,500 milliseconds are 1.5 seconds.
References
NIST SP 811, Guide for the Use of the International System of Units, including its conversion factors: https://www.nist.gov/pml/special-publication-811.