Feed & Speed Calculator
Calculate RPM and feed from cutting speed, diameter, flute count and chip load.
Open calculator →The CNC Calculator Library groups the core calculations used when converting cutting data into machine values. Choose a dedicated tool when you need a single variable checked, or use the Feed & Speed calculator when you need the full RPM/feed relationship.
Calculator library
Core Feed & Speed
Open the dedicated calculation and inspect its formula, inputs, examples and related references.
Spindle Speed Calculator
Calculate spindle RPM from cutting speed and diameter.
Open calculator →RPM Calculator
Calculate spindle speed from cutting speed and tool diameter.
Open calculator →Feed Rate Calculator
Calculate programmed feed from RPM, flute count and chip load.
Open calculator →Chip Load Calculator
Calculate chip load per tooth from feed, RPM and flute count.
Open calculator →Calculator library
Speed, Production & Reference
Open the dedicated calculation and inspect its formula, inputs, examples and related references.
SFM Calculator
Calculate surface feet per minute from spindle speed and diameter.
Open calculator →Cutting Speed Calculator
Calculate cutting speed from RPM and diameter.
Open calculator →MRR Calculator
Estimate material removal rate from feed and engagement.
Open calculator →Feed Per Revolution Calculator
Calculate feed per revolution from feed rate and RPM.
Open calculator →Cutting Time Calculator
Estimate cutting time from cutting distance and feed.
Open calculator →Tapping Feed Calculator
Calculate synchronized tapping feed from RPM and pitch.
Open calculator →Automatic Feed & Speed Calculator
Review a reference starting point from material and tool inputs.
Open calculator →How the calculator library is organized
Core calculators cover spindle speed, RPM, feed rate, chip load, SFM, cutting speed, MRR, feed per revolution, cutting time, tapping feed and automatic feed and speed. Specialized pages add milling, drilling, turning, metric and tool-specific search intents without duplicating the same calculation page.
Use calculation and source data separately
These tools perform transparent arithmetic. The cutting-speed and chip-load values still need to come from the actual tool/material source. Check machine limits, engagement, workholding and tool stick-out before production.