Trades & Shop
Machining Feed Rate & Speed Converter
Convert CNC milling feed rates, surface speeds, and chip loads between metric and imperial dimensions.
Machining Modifier: mm/min to IPM
How do you convert CNC feed rate from mm/min to IPM? Since one inch equals exactly 25.4 millimeters, divide the metric feed rate (mm/min) by 25.4 to get Inches Per Minute:IPM = mm/min ÷ 25.4. For example, a feed rate of 1000 mm/min translates to exactly 39.37 IPM.
1. Feed Rate (Tool Velocity)
mm/min
↕ divide/multiply by 25.4 ↕
IPM (in/min)
2. Chip Load (Feed Per Tooth)
mm/tooth
↕ divide/multiply by 25.4 ↕
IPT (in/tooth)
3. Cutting Speed (Surface Speed)
m/min
↕ divide/multiply by 3.28084 ↕
SFM (ft/min)