Router Speed Calculator
Calculate optimal router RPM based on bit diameter and material type
About this calculator
The Router Speed Calculator helps woodworkers and machinists determine the optimal RPM (revolutions per minute) for their router based on the bit diameter and material being cut. Using the correct speed is crucial for achieving clean cuts, extending bit life, and ensuring safe operation. Running a router at improper speeds can cause burning, tear-out, premature bit wear, or dangerous kickback, making this calculator an essential tool for both professional and hobbyist woodworkers.
How to use
Enter your router bit diameter in inches or millimeters, then select your material type from the dropdown menu. The calculator will instantly display the recommended RPM range for optimal cutting performance. Always start at the lower end of the suggested range and adjust upward as needed based on your specific router and cutting conditions.
Frequently asked questions
Why does bit diameter affect router speed?
Larger bits have higher surface speeds at their edges, requiring lower RPMs to prevent overheating, burning, and maintain control during cutting operations.
What happens if I use the wrong RPM?
Incorrect speeds can cause bit burning, poor cut quality, premature wear, splintering, or dangerous kickback that could damage your project or cause injury.
Should I always use the maximum recommended RPM?
Start with lower RPMs and gradually increase. Harder materials, deeper cuts, and larger bits typically require slower speeds for optimal results.