Revolutions Per Hour
A part that turns 60 times an hour turns once a minute, which is 1 RPM.
Quick answer: Divide the revolutions per hour by 60. For example, 60 rev/h is 1 RPM, 600 rev/h is 10 RPM and 6,000 rev/h is 100 RPM.
The revolutions per hour to RPM formula
Speed in RPM equals revolutions per hour divided by 60.
There are 60 minutes in an hour.
Take 60 rev/h. 60 × 0.01666667 gives 1 RPM.
Take 600 rev/h. 600 × 0.01666667 gives 10 RPM.
Slow turning
Revolutions per hour suits very slow motion. A minute hand on a clock makes one revolution each hour.
Dividing by 60 puts the speed on the usual RPM scale.
How to convert revolutions per hour to RPM step by step
- Read the turns per hour.
- Divide by 60 to get turns per minute.
- Round to the digits you need.
- Write RPM after the answer.
Example 1: 60 rev/h
- Start with 60 rev/h.
- 60 × 0.01666667 = 1.
- The rotation rate is 1 RPM.
60 rev/h = 1 RPM
Example 2: 600 rev/h
- Start with 600 rev/h.
- 600 × 0.01666667 = 10.
- The rotation rate is 10 RPM.
600 rev/h = 10 RPM
Example 3: 6,000 rev/h
- Start with 6,000 rev/h.
- 6,000 × 0.01666667 = 100.
- The rotation rate is 100 RPM.
6,000 rev/h = 100 RPM
Example 4: 300 rev/h
- Start with 300 rev/h.
- 300 × 0.01666667 = 5.
- The rotation rate is 5 RPM.
300 rev/h = 5 RPM
Example 5: 3,000 rev/h
- Start with 3,000 rev/h.
- 3,000 × 0.01666667 = 50.
- The rotation rate is 50 RPM.
3,000 rev/h = 50 RPM
Example 6: 120 rev/h
- Start with 120 rev/h.
- 120 × 0.01666667 = 2.
- The rotation rate is 2 RPM.
120 rev/h = 2 RPM
Round only at the end. Rounding in the middle of a sum adds small errors that grow.
revolutions per hour to RPM conversion table
| Revolutions per hour (rev/h) | Revolutions per minute (RPM) | Degrees per second (deg/s) |
|---|---|---|
| 6 rev/h | 0.1 RPM | 0.6 Degrees per second (deg/s) |
| 15 rev/h | 0.25 RPM | 1.5 Degrees per second (deg/s) |
| 30 rev/h | 0.5 RPM | 3 Degrees per second (deg/s) |
| 60 rev/h | 1 RPM | 6 Degrees per second (deg/s) |
| 120 rev/h | 2 RPM | 12 Degrees per second (deg/s) |
| 300 rev/h | 5 RPM | 30 Degrees per second (deg/s) |
| 600 rev/h | 10 RPM | 60 Degrees per second (deg/s) |
| 1,200 rev/h | 20 RPM | 120 Degrees per second (deg/s) |
| 3,000 rev/h | 50 RPM | 300 Degrees per second (deg/s) |
| 6,000 rev/h | 100 RPM | 600 Degrees per second (deg/s) |
| 15,000 rev/h | 250 RPM | 1,500 Degrees per second (deg/s) |
| 30,000 rev/h | 500 RPM | 3,000 Degrees per second (deg/s) |
The highlighted row is the default of the calculator. The last column gives Degrees per second (deg/s).
A quick mental shortcut for revolutions per hour to RPM
Divide by 60 in your head by dividing by 6 and then by 10. 600 rev/h is 100 over 10, so 10 RPM.
That is exact here.
A minute hand
A minute hand makes 1 revolution each hour, which is about 0.0167 RPM. An hour hand makes 1 revolution every 12 hours, which is 1/12 rev/h.
These are very slow speeds.
Slow machines
Mixers, kilns, rotating displays and some antennas turn at a few revolutions per hour or per minute.
RPM is easier to compare with other machines.
Degrees per second
One revolution per hour is 0.1 degrees per second, because 360 degrees spread over 3,600 seconds is 0.1.
The last column uses this factor.
Quick conversion answers
| Conversion | Result |
|---|---|
| 60 rev/h | 1 RPM |
| 600 rev/h | 10 RPM |
| 6,000 rev/h | 100 RPM |
| 60,000 rev/h | 1,000 RPM |
Where this conversion is used
Engineers compare slow rotating machines.
Students practise time unit changes.
Common mistakes to avoid
- Multiplying instead of dividing. RPM is the larger time unit rate.
- Using 24 for a day. An hour has 60 minutes.
- Mixing rev/h and rev/day. Check the time unit.
- Rounding tiny values to zero. Keep enough digits.
Related converters
More values at a glance
1.2 rev/h is 0.02 RPM. 18 rev/h is 0.3 RPM. 45 rev/h is 0.75 RPM.
90 rev/h is 1.5 RPM. 180 rev/h is 3 RPM. 240 rev/h is 4 RPM.
900 rev/h is 15 RPM. 1,500 rev/h is 25 RPM. 12,000 rev/h is 200 RPM.
Slow rotation examples
1 rev/h is 0.01667 RPM. 6 rev/h is 0.1 RPM. 12 rev/h is 0.2 RPM.
30 rev/h is 0.5 RPM. 90 rev/h is 1.5 RPM. 300 rev/h is 5 RPM.
1,200 rev/h is 20 RPM. 3,600 rev/h is 60 RPM. 18,000 rev/h is 300 RPM.
More worked values
1 rev/h is 0.016667 RPM. 2 rev/h is 0.033333 RPM. 4 rev/h is 0.066667 RPM.
8 rev/h is 0.133333 RPM. 15 rev/h is 0.25 RPM. 25 rev/h is 0.416667 RPM.
40 rev/h is 0.666667 RPM. 75 rev/h is 1.25 RPM. 100 rev/h is 1.666667 RPM.
Going the other way
To turn RPM back into rev/h, do the opposite step.
1 RPM is 60 rev/h. 5 RPM is 300 rev/h. 10 RPM is 600 rev/h.
20 RPM is 1,200 rev/h. 50 RPM is 3,000 rev/h. 100 RPM is 6,000 rev/h.
250 RPM is 15,000 rev/h. 500 RPM is 30,000 rev/h.
A full worked example
Take 7.5 rev/h. Multiply by 0.016667 to get 0.125 RPM.
Now check it. Turn 0.125 RPM back into rev/h and you should land on 7.5 again.
If you do not, look for a slipped decimal point or a swapped unit.
Rounding the answer
Keep about as many digits as your input has. For example, 12.3456 rev/h is 0.20576 RPM, which is 0.2058 RPM to 4 decimals.
Round only at the end. Rounding early can add a small error to the final number.
Small and large values
0.1 rev/h is 0.001667 RPM. 0.25 rev/h is 0.004167 RPM. 0.5 rev/h is 0.008333 RPM.
3 rev/h is 0.05 RPM. 6 rev/h is 0.1 RPM. 12 rev/h is 0.2 RPM.
30 rev/h is 0.5 RPM. 60 rev/h is 1 RPM. 150 rev/h is 2.5 RPM.
200 rev/h is 3.333333 RPM. 300 rev/h is 5 RPM. 400 rev/h is 6.666667 RPM.
More values in the reverse direction
2 RPM is 120 rev/h. 3 RPM is 180 rev/h. 25 RPM is 1,500 rev/h.
30 RPM is 1,800 rev/h. 40 RPM is 2,400 rev/h. 60 RPM is 3,600 rev/h.
75 RPM is 4,500 rev/h. 200 RPM is 12,000 rev/h. 400 RPM is 24,000 rev/h.
1,000 RPM is 60,000 rev/h.
Frequently asked questions
How many Revolutions per minute is 1 rev/h?
1 rev/h is 0.01666667 RPM.
How many Revolutions per minute is 600 rev/h?
600 rev/h is 10 RPM.
How many Revolutions per hour is 1 RPM?
1 RPM is 60 rev/h.
How many RPM is 600 rev/h?
10 RPM.
How many rev/h is 1 RPM?
60 rev/h.
How many RPM is 1 rev/h?
About 0.0167 RPM.
Sources
- Lucidar: rpm to m/s converter (lucidar.me)
