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    Speeds and feeds, drill and tap, thread sizes and everyday shop math. Type a thread, size, material or tool to jump straight to the answer.

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    Speeds & Feeds

    RPM, feed, chip load, MRR and cycle time

    Drilling & Tapping

    Drill speeds, tap drills, thread % and drill sizes

    Threading

    Thread pitch and single-point lathe threading

    Milling Strategy

    Chip thinning, HEM, cutter bodies and power

    Turning

    Lathe speeds, feeds and surface finish

    Shop Math

    Trig, tolerances, hardness, units and sheet metal

    Reference Charts

    Tap drill, drill size, thread and SFM tables

    Materials

    Speeds and feeds by workpiece material

    Popular guides

    Every calculator

    Math CalculatorGeneral-purpose calculator with order of operations, functions, and history.Feeds & Speeds WizardEvery tool type (mills, drills, reamers, taps, thread mills, turning) with 280+ materials, chip thinning, HSM, overrides, machine limits and partner data.Speed & Feed CalculatorRPM, feed rate, and chip load from SFM and cutter geometry.Milling CalculationsMilling speed, feed, chip thinning and HFM geometry.Turning CalculationsLathe RPM, feed per revolution and material removal rate.Drilling CalculationsDrilling RPM, feed per revolution, point allowance and cutting time.Lathe ThreadingSingle-point threading pitch, multi-start lead and synchronized feed.Sheet Metal BendingBend allowance, bend deduction, flat length, K-factor, press brake tonnage, bend radius and gauge chart.Chip Thinning & HEMHigh-efficiency (adaptive) milling: chip thinning, ball-nose effective diameter, spindle power, torque and machine RPM/HP/feed limits.Thread Percentage CalculatorPercent of thread from any drill for cut and form taps, with 75%, 65% and 50% tap drills.Drill Chart & Size FinderFractional, number, letter and metric drills with decimal equivalents and a nearest-drill finder.Drill & Tap ReferenceFull drill chart (#97-#1, A-Z, 1/64-4 in, 0.1-60 mm), tap drills to 4 in and M64, pipe taps to 4 in, STI inserts, Silver & Deming and aircraft drills, drill speeds, feeds and pecks.Tool Material & Coating SelectorWhich cutting tool material (HSS, cobalt, carbide, cermet, ceramic, CBN, PCD) and coating fits your workpiece.Turning Insert Speeds & FinishSourced turning speed and feed per rev by insert grade (coated, uncoated, cermet, ceramic, CBN, PCD) and operation, with theoretical Ra.Cutting Force, Torque & PowerKienzle cutting force, spindle power and torque for milling and turning from kc1.1 and mc.Tool Deflection CalculatorEnd mill deflection from side load, stickout, flute length and carbide or HSS stiffness, with warnings.Thread Milling CalculatorThread mill RPM, compensated tool-centre feed, toolpath radius, radial passes and arc-in for internal and external threads.Countersink & Chamfer DepthZ depth for a countersink diameter at any included angle, and chamfer depth on a hole edge.Bolt Circle CalculatorHole coordinates on a bolt circle with G81/G83 drilling G-code.Tap Drill ChartRecommended tap drill sizes for UNC, UNF, and metric threads.Tolerance CalculatorMin/max dimensions, bilateral tolerance stackup, and pass/fail.Unit ConverterLength, weight, pressure, temperature, torque, and speed.Surface Finish CalculatorTheoretical Ra from feed rate and tool nose radius.Right Triangle SolverSolve any right triangle from two known values.Material Removal RateVolumetric MRR for milling and turning operations.Cycle Time EstimatorEstimate total cycle time from cutting parameters.Hardness ConverterConvert between HRC, HRB, Brinell, Vickers scales.Thread Pitch CalculatorTPI ↔ pitch conversion and standard thread specs.

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