Router Bit Speed Calculator
Calculate optimal router speed and feed rate for different bit sizes and materials
About this calculator
The Router Bit Speed Calculator helps woodworkers determine the optimal spindle speed (RPM) and feed rate for different router bit sizes and materials. Using the correct speed prevents bit breakage, reduces heat buildup, and ensures clean cuts while maximizing bit life. This calculator takes the guesswork out of router setup by providing precise speed recommendations based on bit diameter, material type, and cutting depth for professional-quality results.
How to use
Enter your router bit diameter, select the material you're cutting (hardwood, softwood, plywood, etc.), and specify the cutting depth. The calculator will instantly provide the recommended RPM and feed rate. Always start at the lower end of suggested speeds and gradually increase while monitoring cut quality and bit performance.
Frequently asked questions
What happens if I run my router bit too fast?
Running bits too fast causes overheating, burning, poor cut quality, and premature bit wear. Large bits are especially prone to breakage at high speeds.
Should I adjust speed for different wood types?
Yes, hardwoods typically require slower speeds and feed rates than softwoods. Dense materials like maple need more conservative settings than pine.
How does bit diameter affect optimal speed?
Larger diameter bits must run at slower RPMs because their outer edge travels faster. Small bits can handle higher speeds safely.