Spindle speed to surface feet per minute
Type a value in rpm to get it in SFM instantly.
51.54SFM
Nothing on our list is smaller: carbide in titanium is 3.2× faster.
Convert the other way: SFM to rpm
What it means
How fast is that cut?
Pick the diameter of the rotating part: the tool on a mill or drill, the workpiece on a lathe. Speeds for materials are starting points; follow the tool maker’s data.
The math
How to convert rpm to SFM
rpm = 1000 × v ÷ (π × D) with v in m/min and D in mm; rpm = 12 × SFM ÷ (π × D) with D in inches.
Example: 500 rpm = 51.5353 SFM.
RPM figures on this page are for 10 mm. Pick another diameter above and they change.
Every unit
That speed in every unit
Tables
rpm to SFM conversion table
| rpm | SFM |
|---|---|
| 50 rpm | 5.15353 SFM |
| 100 rpm | 10.3071 SFM |
| 150 rpm | 15.4606 SFM |
| 200 rpm | 20.6141 SFM |
| 250 rpm | 25.7677 SFM |
| 300 rpm | 30.9212 SFM |
| 400 rpm | 41.2283 SFM |
| 500 rpm | 51.5353 SFM |
| 600 rpm | 61.8424 SFM |
| 800 rpm | 82.4565 SFM |
| 1,000 rpm | 103.071 SFM |
SFM to rpm conversion table
| SFM | rpm |
|---|---|
| 50 SFM | 485.104 rpm |
| 100 SFM | 970.209 rpm |
| 150 SFM | 1,455.31 rpm |
| 200 SFM | 1,940.42 rpm |
| 250 SFM | 2,425.52 rpm |
| 300 SFM | 2,910.63 rpm |
| 400 SFM | 3,880.83 rpm |
| 500 SFM | 4,851.04 rpm |
| 600 SFM | 5,821.25 rpm |
| 800 SFM | 7,761.67 rpm |
| 1,000 SFM | 9,702.09 rpm |
Quick answers
Quick answers
- How many SFM is 1 rpm?
- 1 rpm is 0.103071 SFM.
- How many SFM is 10 rpm?
- 10 rpm is 1.03071 SFM.
- How many SFM is 500 rpm?
- 500 rpm is 51.5353 SFM.
The units
About these units
Spindle speed (rpm)
Revolutions per minute for the chosen diameter.
Surface feet per minute (SFM)
Surface speed in feet per minute, as US catalogs give it.
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