Convert m/min to SFM (surface feet per minute) or SFM to m/min, also called SMM or Vc, and optionally get the spindle RPM for a cutting diameter.
- All Unit Converters
- Drill SFM Calculator
- Surface Speed Calculator
- RPM to SFM Converter
- Spindle Speed Calculator
- Feed Rate Calculator
| m/min to SFM (ft/min) | SFM (ft/min) to m/min |
|---|---|
| 5 m/min ≈ 16.4042 ft/min | 50 ft/min = 15.2400 m/min |
| 10 m/min ≈ 32.8084 ft/min | 75 ft/min = 22.8600 m/min |
| 20 m/min ≈ 65.6168 ft/min | 100 ft/min = 30.4800 m/min |
| 30 m/min ≈ 98.4252 ft/min | 150 ft/min = 45.7200 m/min |
| 50 m/min ≈ 164.0420 ft/min | 200 ft/min = 60.9600 m/min |
| 75 m/min ≈ 246.0630 ft/min | 250 ft/min = 76.2000 m/min |
| 100 m/min ≈ 328.0840 ft/min | 300 ft/min = 91.4400 m/min |
| 150 m/min ≈ 492.1260 ft/min | 400 ft/min = 121.9200 m/min |
| 200 m/min ≈ 656.1680 ft/min | 500 ft/min = 152.4000 m/min |
| 250 m/min ≈ 820.2100 ft/min | 600 ft/min = 182.8800 m/min |
| 300 m/min ≈ 984.2520 ft/min | 800 ft/min = 243.8400 m/min |
| 400 m/min ≈ 1,312.3360 ft/min | 1,000 ft/min = 304.8000 m/min |
| 500 m/min ≈ 1,640.4199 ft/min | 1,200 ft/min = 365.7600 m/min |
| 600 m/min ≈ 1,968.5039 ft/min | 1,500 ft/min = 457.2000 m/min |
| 800 m/min ≈ 2,624.6719 ft/min | 2,000 ft/min = 609.6000 m/min |
| 1,000 m/min ≈ 3,280.8399 ft/min | 2,500 ft/min = 762.0000 m/min |
| 1,200 m/min ≈ 3,937.0079 ft/min | 3,000 ft/min = 914.4000 m/min |
| 1,500 m/min ≈ 4,921.2598 ft/min | 3,500 ft/min = 1,066.8000 m/min |
| 2,000 m/min ≈ 6,561.6798 ft/min | 4,000 ft/min = 1,219.2000 m/min |
| 2,500 m/min ≈ 8,202.0997 ft/min | 5,000 ft/min = 1,524.0000 m/min |
| Exact definition: 1 ft = 0.3048 m. SFM = (m/min) / 0.3048; m/min = SFM × 0.3048. Table values are rounded to four decimals. | |
m/min To SFM Formula
The following uses the exact international-foot definition, 1 ft = 0.3048 m. The reciprocal 1/0.3048 is approximately 3.280839895 feet per meter; the shorter factor 3.28084 is rounded.
Variables:
- SFM = surface feet per minute (ft/min)
- m/min = speed in meters per minute
- 0.3048 is the exact number of meters per international foot
Reverse conversion: m/min = SFM × 0.3048. The calculator retains the exact definition in both directions and rounds only the displayed result. Very small or large values use scientific notation; choosing more decimal places does not make an input measurement more accurate.
What is SFM in Machining?
SFM means surface feet per minute: circumferential cutting speed expressed in ft/min. The metric equivalent is m/min. At the same RPM, a larger effective cutting diameter produces a higher surface speed. Cutting speed is distinct from feed rate, and unit conversion by itself does not select a suitable machining condition.
The circular-motion relation is RPM = 12 × SFM / [π × diameter(in)] = 1000 × vc(m/min) / [π × diameter(mm)]. The shortcut 3.82 approximates 12/π. Use effective diameter at the actual depth of cut for milling, or the machined diameter for turning. As a geometric example, 244 m/min ≈ 800.5249 SFM corresponds to approximately 6,472.3 RPM at 12 mm, or 3,106.7 RPM at 25 mm. These inputs are examples, not recommendations for any material or cutter; exactly 800 SFM instead converts to 243.84 m/min.
Selecting Application-Specific Cutting Data
Choose cutting data from the tool manufacturer for the specific workpiece material, tool grade and geometry, operation and engagement. Sandvik Coromant distinguishes cutting speed, effective diameter, spindle speed, feed and power; converting one speed unit does not determine the other cutting conditions. Check the machine, spindle, tool and holder limits before applying a calculated RPM. Generic material labels alone do not establish a suitable HSS or carbide speed range.
