Speed & Feed Calculator
Calculate spindle speed, feed rate, chip load, and basic cutting conditions for milling, turning, drilling, grooving, and parting.
Open calculator →Multi-language machining calculators
Machining Calculator Hub
Free CNC machining calculators for speeds and feeds, spindle RPM, chip load, milling, turning, drilling, threading, machining time, material weight and unit conversions.
Quick start
Browse calculators →Most-used machining calculators
Start with the tools machinists most often need for setup, quoting, and shop-floor checks.
Tap Drill Size Calculator
Calculate tap drill size for cutting taps or forming taps from major diameter, pitch/TPI, and desired thread height percentage.
Open calculator →SFM to RPM Calculator
Convert surface feet per minute to spindle speed.
Open calculator →Thread Dimensions Calculator
Estimate basic 60-degree ISO metric or unified thread geometry. This is a basic-profile calculator; production tolerances require the selected thread standard and class.
Open calculator →Material Weight Calculator
Calculate the estimated weight of aluminum, steel, brass, stainless steel, and common plastics from density and part geometry.
Open calculator →Facing, Parting & Grooving Cycle Time Calculator
Estimate cycle time for facing, parting-off, or grooving from radial travel, feed per revolution, and RPM.
Open calculator →All machining calculators
Search or filter the complete calculator library by machining process.
Advanced CalculatorsHigh-level setup tools for speed, feeds, threads, fits, and unit workflows.4
Speed & Feed Calculator
Calculate spindle speed, feed rate, chip load, and basic cutting conditions for milling, turning, drilling, grooving, and parting.
Open calculator →Thread Dimensions Calculator
Estimate basic 60-degree ISO metric or unified thread geometry. This is a basic-profile calculator; production tolerances require the selected thread standard and class.
Open calculator →Engineering Tolerances & Fits Calculator
Calculate hole/shaft ranges, minimum clearance, maximum clearance, and fit type from basic size and deviations.
Open calculator →General Unit Conversions
Convert common machining units such as length, cutting speed, feed rate, power, torque, and pressure.
Open calculator →Milling CalculatorsCore milling formulas, chip thinning, chip load, depth of cut, thread milling, and ball-nose finishing.6
Basic Milling Calculator
Calculate RPM, table feed, material removal rate, and cutting time for a milling operation.
Open calculator →Chip Thinning Calculator
Estimate radial chip thinning compensation and required feed per tooth for a target maximum chip thickness.
Open calculator →Chip Load Calculator
Calculate chip load from feed rate, spindle speed, and number of teeth, or calculate feed rate from target chip load.
Open calculator →Cut Depth Optimizer
Estimate allowable axial depth of cut from available spindle power, radial width, table feed, and specific cutting force.
Open calculator →Thread Milling G-code Generator
Generate a simple thread-milling G-code draft for internal or external 60-degree threads.
Open calculator →Ball Nose Surface Finish Calculator
Calculate scallop height from stepover, or calculate stepover for a target scallop height when using a ball-nose end mill.
Open calculator →Turning CalculatorsTurning formulas, inserts, surface finish, facing time, G76 threading, and knurling.6
Basic Turning Calculator
Calculate RPM, feed rate, material removal rate, and estimated cutting power for turning.
Open calculator →ISO Inserts Calculator
Decode common ISO turning insert symbols and estimate geometry fields such as shape, clearance, tolerance, size, thickness, and nose radius.
Open calculator →Turning Surface Finish Calculator
Estimate theoretical surface finish from feed per revolution and tool nose radius.
Open calculator →Facing, Parting & Grooving Cycle Time Calculator
Estimate cycle time for facing, parting-off, or grooving from radial travel, feed per revolution, and RPM.
Open calculator →Thread Turning G-code Generator
Generate a simplified Fanuc-style G76 threading cycle draft for external or internal 60-degree threads.
Open calculator →Knurling Calculator
Calculate recommended RPM from knurling surface speed and evaluate circumference-to-pitch matching.
Open calculator →Threading CalculatorsThread dimensions, tap drills, coating allowance, thread-milling, thread-turning, and inserts.3
Tap Drill Size Calculator
Calculate tap drill size for cutting taps or forming taps from major diameter, pitch/TPI, and desired thread height percentage.
Open calculator →Thread Coating Thickness Calculator
Estimate pre-coating pitch diameter allowance for a coated 60-degree thread.
Open calculator →HeliCoil / Thread Insert Calculator
Estimate drill size and STI tap direction for common metric coil-thread inserts. Supplier charts differ; verify the insert brand and standard before production.
Open calculator →General MachiningMRR, cutting power, drilling, and cross-process machining calculations.4
Material Weight Calculator
Calculate the estimated weight of aluminum, steel, brass, stainless steel, and common plastics from density and part geometry.
Open calculator →Metal Removal Rate Calculator
Calculate metal removal rate for milling, turning, drilling, and grooving from process-specific parameters.
Open calculator →Machining Power Calculator
Estimate cutting power from metal removal rate, specific cutting force, and machine efficiency.
Open calculator →Drilling Calculator
Calculate drilling RPM, feed rate, metal removal rate, and hole time.
Open calculator →Unit ConversionsHardness, roughness, SFM/RPM, inch fractions, and metric/imperial machining terms.7
Hardness Converter
Approximate steel hardness conversion between HRC, HRB, HV, and HBW. Not valid as an inspection substitute; use ASTM E140 / ISO 18265 material-specific tables or direct testing for acceptance.
Open calculator →Ra ↔ Rz Converter
Convert surface finish between Ra and Rz using an engineering approximation.
Open calculator →Inch Decimal / Fraction Converter
Convert inch decimal values to common fractions, or convert fractions to decimal inches.
Open calculator →SFM to RPM Calculator
Convert surface feet per minute to spindle speed.
Open calculator →RPM to SFM Calculator
Convert spindle speed to surface feet per minute.
Open calculator →Imperial to Metric Calculator
Convert inch-based machining terms to metric values.
Open calculator →Metric to Imperial Calculator
Convert metric machining terms to inch-based values.
Open calculator →Carbide GradesGeneric grade direction tools without proprietary brand databases.3
Carbide Grades Wizard
Generic grade direction tool by ISO material group, operation severity, and cut interruption. It does not use brand-specific proprietary data.
Open calculator →Carbide Grades Converter
A generic conversion helper that maps a known grade style into an equivalent target direction. It does not contain proprietary brand equivalence tables.
Open calculator →Carbide Grades Comparer
Compare two grade descriptions by material group, toughness level, wear level, and coating type.
Open calculator →Additional CalculatorsGD&T, sine bar, bolt-hole circle, and tolerance utilities.3
True Position Calculator
Calculate diametrical true position error from X and Y coordinate deviations.
Open calculator →Sine Bar Calculator
Calculate sine bar stack height from angle, or calculate angle from stack height.
Open calculator →Bolt Hole Circle Calculator
Generate X-Y coordinates for evenly spaced holes on a bolt-hole circle.
Open calculator →Charts
Speeds and Feeds Chart
A machining speeds and feeds chart with cutting speed, spindle speed, chip load, and feed rate formulas for milling, drilling, and turning.
Open chart →Milling Speeds and Feeds Chart
A milling speeds and feeds table for carbide end mills with SFM ranges, chip load by tool diameter, RPM, and feed rate guidance.
Open chart →End Mill Speed Chart
End mill cutting speeds and chip loads for common materials, including aluminum, steel, stainless steel, cast iron, titanium, and nickel alloys.
Open chart →Aluminum Milling Speed Chart
Aluminum surface speed and feed chart for carbide end mills, including 6061, 7075, 2024, cast aluminum, and diamond end mills.
Open chart →Carbide End Mill Cutting Parameters
Carbide end mill cutting parameters with SFM, chip load, RPM, and IPM examples for common CNC milling materials.
Open chart →Surface Speed Chart
Surface footage chart for turning, milling, drilling, and reaming with SFM ranges for common materials and formula references.
Open chart →Spindle Speed Chart
Spindle speed chart that converts SFM and cutter diameter to RPM for common end mill and drill diameters.
Open chart →Drill Spindle Speed Chart
Drill spindle speed chart with HSS drill SFM ranges, RPM examples, feed-per-revolution ranges, and deep-hole adjustment notes.
Open chart →Feed Speed Chart
Feed speed chart for milling that converts RPM, flutes, and chip load into IPM feed rate for common CNC setups.
Open chart →Lathe Feeds and Speeds Chart
Lathe feeds and speeds chart with turning SFM ranges, HSS and carbide speed data, and feed-per-revolution formulas.
Open chart →Built for practical engineering checks
Every calculator keeps the formula visible, runs locally in your browser, and includes limits or verification guidance.
ƒFormula shown
↔Metric and inch units
≡Sources and limits
✓Runs in your browser
Site review: 2026-07-28 · Engineering disclaimer: these tools are for estimating and planning. Verify production parameters with toolmaker catalogs, machine limits, material data, and applicable standards.