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Chip Load Calculator
Calculate optimal feed rate, RPM, and chipload for CNC machining
🔧 Chip Load = Feed Rate ÷ (RPM × Number of Flutes) • Adjust for depth of cut & material
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Chip Load (IPT)
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Feed Rate (IPM)
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Spindle Speed (RPM)
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Recommended Chip Load Range
📈 Optimization Tip
Enter your feed rate, RPM, and flutes to calculate chip load. Adjust for material and depth of cut.
Enter your feed rate, RPM, and flutes to calculate chip load. Adjust for material and depth of cut.
| Material | Chip Load Range (IPT) | Recommended Feed Rate (IPM) | Surface Speed (SFM) |
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Calculate optimal chip load for CNC machining — fast, free, no signup
What is Chip Load?
Chip load is the thickness of material removed by each cutting edge (tooth) of a CNC tool per revolution. It's the most critical factor for tool life, surface finish, and machining efficiency. Proper chip load prevents tool breakage, reduces heat buildup, and ensures consistent part quality.
Chip Load Formula
CL = FR ÷ (RPM × N)
Where: CL = Chip Load (inches per tooth) | FR = Feed Rate (IPM) | RPM = Spindle Speed | N = Number of flutes
How to Use This Calculator
- Calculate chip load from existing settings: Enter Feed Rate, RPM, and Flutes
- Optimize feed rate: Enter target chip load to find optimal feed rate
- Material selection: Choose material for recommended chip load range
- Depth of cut: Select depth factor to automatically adjust recommendations
- Tool type: Account for downcut or plastic-specific bits
Recommended Chip Load Ranges
- Hardwood: 0.010" – 0.020" IPT (start at 0.014")
- Softwood: 0.015" – 0.030" IPT (start at 0.020")
- Plywood/MDF: 0.012" – 0.022" IPT
- Aluminum: 0.002" – 0.008" IPT (start at 0.004")
- Brass: 0.003" – 0.010" IPT
- Mild Steel: 0.001" – 0.004" IPT
- Plastic (Acrylic): 0.005" – 0.015" IPT
Depth of Cut Adjustments
- Standard depth (≤1× tool diameter): Use recommended chip load
- Deep (1× to 2× tool diameter): Reduce chip load by 20-25%
- Very deep (2× to 3× tool diameter): Reduce chip load by 40-50%
Tool Type Considerations
- Compression/Upcut: Standard chip load values apply
- Downcut spiral: Reduce feed rate by 30% for dadoes/grooves
- Plastic bits: Run at lower RPM (~14,000) with chip load 0.005-0.015 IPT
Frequently Asked Questions
- What is a good chip load for wood? — 0.015-0.025 inches per tooth for hardwoods, 0.020-0.030 for softwoods.
- What happens if chip load is too high? — Excessive tool wear, tool breakage, poor surface finish, machine chatter.
- What happens if chip load is too low? — Heat buildup, friction welding, shortened tool life, burning of material.
- How do I calculate chip load for aluminum? — Start at 0.004" IPT for 2-flute tools, reduce for smaller diameters.
- Does chip load change with tool diameter? — Yes, smaller diameters require lower chip loads to prevent breakage.