Surface feet per minute to spindle speed
Type a value in SFM to get it in rpm instantly.
4,851.043rpm
That's 1.52× as fast as carbide in stainless steel, while carbide in mild steel is 1.31× faster.
Convert the other way: rpm to SFM
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 SFM to rpm
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 SFM = 4,851.04 rpm.
RPM figures on this page are for 10 mm. Pick another diameter above and they change.
Every unit
That speed in every unit
Tables
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 |
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 |
Quick answers
Quick answers
- How many rpm is 1 SFM?
- 1 SFM is 9.70209 rpm.
- How many rpm is 10 SFM?
- 10 SFM is 97.0209 rpm.
- How many rpm is 500 SFM?
- 500 SFM is 4,851.04 rpm.
The units
About these units
Surface feet per minute (SFM)
Surface speed in feet per minute, as US catalogs give it.
Spindle speed (rpm)
Revolutions per minute for the chosen diameter.
Keep going