Machining Calculators
A practical collection of CNC machining calculators for turning, milling, drilling, threading and engineering. Find the right formula, understand the inputs, and get to your result faster.
Turning calculators
Spindle speed, feed, power, tool deflection and finishing quality.
Turning Speed and Feed Calculator
Find surface speed, feed per revolution and cutting time for CNC lathe operations.
RPM · feed · cycle timeOpen calculatorCNC Turning Machine Power Calculator
Estimate net cutting power and required machine input power for turning.
power · torque · cutting forceOpen calculatorTurning Surface Roughness Calculator
Estimate theoretical Ra and cusp height from feed per revolution and tool nose radius.
Ra · nose radius · finishComing soonBoring Bar Deflection Calculator
Estimate static tool-tip deflection using bar length, diameter, material and cutting force.
overhang · deflectionComing soonMilling calculators
Face milling, end milling, feed per tooth and cutter engagement.
Face Milling Formulas Calculator
Calculate face-milling speeds, chip load, machining time, MRR, power and torque.
face milling · RPM · MRROpen calculatorEnd Mill Speed and Feed Calculator
Find end-mill spindle RPM, feed rate, cut time and radial chip thinning.
end mills · RPM · chip loadComing soonMilling Chip Load Calculator
Convert flute count, spindle speed and feed into feed per tooth and table feed.
chip load · flutes · feedComing soonRadial Chip Thinning Calculator
Calculate chip thinning at low radial engagement and determine adjusted feed per tooth.
WOC · chip thinningComing soonBall Nose Scallop Height Calculator
Estimate surface scallop height from a ball nose cutter diameter and stepover.
ball nose · stepoverComing soonDrilling calculators
Drill speeds, cycle time, drilling power and hole geometry.
Drilling Speed and Feed Calculator
Calculate drilling RPM, feed, cutting time and MRR from drill diameter and material.
drill RPM · feed · timeComing soonDrilling Power and Torque Calculator
Estimate net drilling power, machine input power and spindle torque from cutting conditions.
drill power · torqueComing soonDrill Point Length Calculator
Calculate drill-tip cone length for a given drill diameter and point angle.
118° · 140° · tip lengthComing soonBolt Circle (PCD) Calculator
Generate CNC XY coordinates for equally spaced holes on a pitch circle diameter.
PCD · XY coordinatesComing soonCountersink Depth Calculator
Find axial countersink depth from the hole diameter, countersink diameter and angle.
countersink · depth · angleComing soonThreading calculators
Tap drill sizes, pitch conversion and thread geometry.
Tap Drill Size Calculator
Find approximate tapping hole diameter for metric and inch cutting or forming taps.
metric · UNC · UNFComing soonThread Pitch and TPI Calculator
Convert pitch and threads per inch; calculate lead for multi-start threads.
pitch · TPI · leadComing soonMetric Thread Basic Dimensions Calculator
Calculate basic pitch diameter and minor diameter for ISO metric 60° threads.
ISO metric · dimensionsComing soonTapping Speed and Feed Calculator
Find tapping RPM, synchronized feed and estimated cut time from pitch and cutting speed.
tap RPM · feed · timeComing soonEngineering calculators
Material properties, time estimation and removal rate.
Steel Hardness Conversion Calculator
Convert steel hardness between HRC, HRB, HV and HB using approximate reference values.
HRC · HRB · HB · HVOpen calculatorMachining Time Calculator
Estimate theoretical cutting time for common machining passes from distance and feed.
cut time · feedComing soonMetal Removal Rate Calculator
Compare material removal rates for milling, drilling and turning in metric or imperial units.
MRR · cm³/min · in³/minComing soonNo matching calculators
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How to find the right calculator
Start with turning, milling, drilling, threading or general engineering.
Individual pages explain each parameter, unit, formula and example calculation.
Compare theoretical results with the machine limits and tool manufacturer's recommendations.
Common questions
Which machining calculators are included?
This directory covers spindle speed and feed, metal removal rate, machining time, power, drilling geometry, thread dimensions, and surface finish.
Do the calculators support metric and imperial units?
Many calculators support metric and imperial units. Available unit modes are shown inside each tool.
Are these values safe to use directly on a CNC machine?
Results are engineering estimates or geometric relationships. Always verify material, tool grade, setup rigidity and machine limits before applying them.
Which tool should I use for feed and speed calculations?
Choose the calculator that matches your operation: turning for lathe work, end milling for solid end mills, face milling for face cutters, and drilling for holemaking.
Calculated values are provided for reference and planning. Tool-specific recommendations and shop-floor constraints take precedence.
