Mechanical
Gear Ratio Calculator
Gear ratio, output RPM, and torque for spur pairs, compound trains, direct ratio, speed solve, or idler trains.
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82 free calculators for mechanical design, manufacturing, GD&T, thermal systems, and shop-floor work. Browse by category or jump straight into the calculator you need.
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Open a category page for a focused list of related calculators.
Mechanical Calculators
Beams, bolts, springs, gears, bearings, and core ME calculations.
37 calculators
Fluid Power Calculators
Pneumatic and hydraulic cylinder force, and hydraulic pump sizing.
3 calculators
Manufacturing Calculators
Welding, stamping, punch and die tooling, 3D printing, material weight, and production automation.
7 calculators
Machining & CNC Calculators
Cutting speed, feeds, RPM, cycle time, and tap drill charts.
11 calculators
Fixture & Tooling Calculators
Clamping, locating pins, tolerance stack-up, and gauge R&R.
4 calculators
GD&T & Metrology Calculators
True position, fits, ISO tolerances, and surface roughness.
5 calculators
Sheet Metal Calculators
Bend allowance, K-factor, flat pattern length, and minimum bend radius.
2 calculators
Thermal & Fluids Calculators
Heat transfer, pipe flow, Reynolds number, and thermodynamic cycles.
6 calculators
EV & Renewable Calculators
Battery sizing, solar panel tilt, wind turbine performance, and EV drivetrain estimates.
5 calculators
Utilities Calculators
Scientific calculator and engineering unit converter.
2 calculators
Full calculator list
All 82 calculators grouped by category. Use the header search to find a specific calculator.
Mechanical Calculators
Beams, bolts, springs, gears, bearings, and core ME calculations.
Mechanical
Beam Stress and Deflection Calculator
Six textbook beam cases: max moment, shear, stress, deflection, slope, and L/360 check with animated 2D sketches.
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Bolt Torque Calculator
Tightening torque or clamp load from T = K × F × d. Metric sizes, property class % proof, and reverse torque mode.
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Safety Factor Calculator
Factor of safety from strength ÷ stress. Yield or ultimate basis, material presets, and reverse solve modes.
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Motor Gearbox Selector Calculator
Motor power from load torque, or gearbox output torque from motor power, ratio, SF, and efficiency.
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Spring Calculator
Compression spring rate, Wahl stress, solid height by end type, and buckling checks. Metric or imperial; OD, ID, or mean diameter.
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Chain Drive Calculator
ANSI roller chain length, pitch diameters, wrap angle, design power, and tensile safety factor.
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Belt Drive Calculator
Classical, narrow, cogged, flat, timing, and poly-V belt sizing plus open/crossed length and C from L.
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Conveyor Power and Tension Calculator
CEMA-simplified bulk Te, motor power, and T1/T2, plus package force/torque from drum diameter.
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Wire Rope Load Calculator
Wire rope SWL and sling capacity from diameter and construction, plus rope mass and reel/drum capacity screens.
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Bearing Life (L10) Calculator
ISO 281 L10 and adjusted Lnm life from C, P, speed, and reliability factors a1/a2/a3.
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Press Fit and Shrink Fit Calculator
Lamé contact pressure, hub/shaft stress, torque and press force, yield safety factors, and shrink ΔT for interference fits.
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Flywheel Energy Calculator
Stored flywheel KE, tip speed, hoop-stress screen, speed-fluctuation ΔE/Cs, and material-limited specific energy.
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Shaft Design Calculator
Minimum shaft diameter from torsion, bending, Guest/Rankine combined, ASME Km/Kt, or twist limit. Solid or hollow.
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Shaft Diameter Calculator
Quick solid or hollow shaft diameter from power/RPM or torque under pure torsion, with stock size and keyway option.
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Critical Speed Calculator
First critical whirling speed from static sag, shaft EI geometry, or screw end-fixity, with operating-speed margin.
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Coupling Selection Calculator
Design torque Td from power or direct Tn, service factor Ks, and coupling family screening matrix.
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Bearing Load Calculator
ISO 281 equivalent dynamic load P from Fr/Fa and type factors, plus two-bearing shaft reactions.
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Bearing Selection Calculator
Recommend rolling-element bearing family from Fr/Fa, DN, required L10 hours, misalignment, and required dynamic C.
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Spur Gear Design Calculator
ISO 53 spur blank, pair a/εα, tooth proportions, Lewis bending, and Ft/Fr force triangle — six modes with 2D sketches.
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Helical Gear Design Calculator
ISO-style helical blank, pair a/εγ, lead, contact ratios, Lewis bending, and Ft/Fa/Fr force triangle — six modes with 2D sketches.
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Bevel Gear Design Calculator
Straight bevel pitch cones, blanks, mounting A, face/zv, Lewis bending, and Ft/Fa/Fr — six modes with 2D sketches.
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Gear Train Calculator
Multi-stage compound gear train (1–4 stages), simple+idler path, or target-RPM reverse ratio with tooth-pair search.
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Bolt / Fastener Strength Calculator
ISO bolt capacity: As, proof/yield/ultimate loads, FoS vs axial load, recommended preload, estimated shear.
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Bolt Pattern / Group Calculator
Elastic bolt-group shear: rectangular, circular, or custom pattern under Vx, Vy, eccentricity, and Mz.
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Key & Keyway Design Calculator
ANSI B17.1 / ISO 773 key lookup plus parallel-key shear and bearing stress check under torque.
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Tension Spring Calculator
Extension spring rate, initial tension, Wahl stress, and Safe/Fail. Metric or Imperial; linked OD/ID.
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Torsion Spring Calculator
Torsion spring angular rate, deflection, and bending stress. Metric or Imperial; moment or force × arm; linked OD/ID.
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Fatigue Life Calculator
Marin-corrected endurance limit with Goodman, Soderberg, and Gerber fatigue factors of safety plus Basquin life estimate.
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Stress Concentration Factor (Kt) Calculator
Peterson / Pilkey Kt for holes, flat-bar and shaft fillets, plus optional σmax and fatigue Kf.
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Column Buckling Calculator
Euler and Johnson critical buckling load, slenderness, and FOS check for compression columns.
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Pressure Vessel Calculator
Thin/thick wall stresses, Lamé inner hoop, and required thickness with joint efficiency.
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Von Mises Stress Calculator
Distortion-energy equivalent stress from plane stress, principals, or a 3D tensor, with yield check.
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Screw Jack Calculator
Raising and lowering torque, handle effort, efficiency, collar drag, and self-locking for screw jacks.
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Mohr's Circle Calculator
Plane-stress principals, max shear, principal angle, stress transformation, and von Mises from σx, σy, τxy.
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Vibration Natural Frequency Calculator
SDOF natural frequency from spring-mass, static sag, or pendulum, with damping and resonance check.
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Material Property Database
Look up and compare typical mechanical and thermal properties for steels, aluminum, copper, titanium, and polymers — Metric or Imperial.
Open calculatorFluid Power Calculators
Pneumatic and hydraulic cylinder force, and hydraulic pump sizing.
Fluid Power
Pneumatic Cylinder Force Calculator
Extend and retract air-cylinder force from pressure, bore, and rod. Metric or Imperial, with optional friction loss.
Open calculatorFluid Power
Hydraulic Cylinder Force Calculator
Extend and retract force, areas, and optional stroke speed from pressure, bore, rod, and oil flow. Metric or Imperial.
Open calculatorFluid Power
Hydraulic Pump Selector Calculator
Size a positive-displacement hydraulic pump: drive power, output flow, or required displacement.
Open calculatorManufacturing Calculators
Welding, stamping, punch and die tooling, 3D printing, material weight, and production automation.
Manufacturing
Metal Weight Calculator
Bar, plate, tube, washer, and structural weight plus material cost from alloy density, shape dims, quantity, and margin. Metric or Imperial with dual kg/lb.
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Punch and Die Design Calculator
Die clearance, cutting force, stripper, tonnage, and punch or die size for blanking, piercing, notching, cutoff, lancing, trimming, shaving, and perforating.
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Weld Joint Strength Calculator
Fillet and groove weld capacity for tee, lap, corner, edge, and butt joints — throat, stress, and factor of safety.
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Welding Heat Input Calculator
ASME or EN ISO heat input in kJ/mm and kJ/in from volts, amps, and travel speed.
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PLC Timer and Counter Calculator
Snapshot TON, TOF, TP, and RTO timers, CTU/CTD/CTUD counters, plus a rule-of-thumb PLC scan and max response estimate.
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Machining Cost Calculator
Estimate CNC cost per part and job total from material, cycle time, setup, tooling, finishing, and margin.
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3D Print Cost Calculator
Quote FDM jobs from slicer weight and time, or estimate from volume. Material, electricity, machine, labor, failure buffer, and margin.
Open calculatorMachining & CNC Calculators
Cutting speed, feeds, RPM, cycle time, and tap drill charts.
Machining & CNC
Cutting Speed and RPM Calculator
Spindle RPM and table feed from Vc/SFM, or reverse cutting speed from dialed RPM — Metric or Imperial.
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Lathe RPM and Cutting Speed Calculator
Spindle RPM and achieved peripheral speed from work diameter and cutting speed.
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Milling RPM and Feed Calculator
Milling spindle RPM and table feed from cutting speed, tool diameter, and chip load.
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Drilling RPM and Feed Calculator
Drill RPM and feed rate from diameter, cutting speed, and feed per revolution.
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Grinding Wheel Speed Calculator
Wheel peripheral speed in m/s, m/min, and SFPM with rated-speed check.
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Saw Cutting Force and Power Calculator
Circular saw cutting power, motor power, torque, and force-related outputs.
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EDM MRR Calculator
Electrical discharge machining material removal rate from pulse energy and frequency.
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CNC Cycle Time Calculator
Per-part cycle time, machining time, and batch hours for CNC production.
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Tap Drill Size Calculator
Recommended tap drill diameter for metric and unified thread sizes.
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Machining Time Estimator
Turning, milling, and drilling cycle time from length, feed, and RPM.
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CNC Feeds and Speeds Calculator
Spindle speed, feed rate, MRR, and cutting power for milling or turning.
Open calculatorFixture & Tooling Calculators
Clamping, locating pins, tolerance stack-up, and gauge R&R.
Fixture & Tooling
Tolerance Stack-Up Calculator
1D loop stack-up with worst-case, RSS, adjusted RSS, Cp/Cpk, and contributor ranking — Metric or Imperial.
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Clamping Force Calculator
Clamping force for toggle, pneumatic, or hydraulic fixture clamps.
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Locating Pin Fit Calculator
Pin–hole clearance, transition, or interference from ISO-style deviations, plus Lamé press-force screening.
Open calculatorFixture & Tooling
Gauge R&R Calculator
MSA Gauge R&R from Xbar-R summary or EV/AV/PV: %GRR vs tolerance and study variation, NDC, AIAG status.
Open calculatorGD&T & Metrology Calculators
True position, fits, ISO tolerances, and surface roughness.
GD&T & Metrology
GD&T True Position Calculator
Diametral true position from X/Y deviations with RFS, MMC, or LMC bonus — Metric or Imperial, 2D or 3D.
Open calculatorGD&T & Metrology
GD&T Fit Calculator
Shaft-hole MMC/LMC clearance, fit type, and optional virtual-condition go-gauge envelopes.
Open calculatorGD&T & Metrology
ISO 286 Tolerance Calculator
ISO 286 hole/shaft limits, deviations, and clearance / transition / interference fit type.
Open calculatorGD&T & Metrology
Surface Roughness Converter
Convert Ra, Rz, Rq/RMS, Rt, CLA, and ISO N-grades with process-based Rz/Ra screening factors.
Open calculatorGD&T & Metrology
ISO Fit & Tolerance Calculator
Build any ISO 286 letter+IT fit (Amesweb style) or look up ISO 2768/IS 2102 general tolerances with IT→process cost map.
Open calculatorSheet Metal Calculators
Bend allowance, K-factor, flat pattern length, and minimum bend radius.
Sheet Metal
Sheet Metal Bend Allowance Calculator
Bend allowance, bend deduction, outside setback, and flat blank from thickness, inside radius, K-factor, and flange measure mode. Metric or Imperial.
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Minimum Bend Radius Calculator
Sheet metal minimum inside bend radius from material, temper, method, grain, and thickness. Optional desired-radius check. Metric or Imperial.
Open calculatorThermal & Fluids Calculators
Heat transfer, pipe flow, Reynolds number, and thermodynamic cycles.
Thermal & Fluids
Reynolds Number Calculator
Reynolds number and flow regime for pipe, duct, flat plate, or sphere — kinematic or dynamic viscosity.
Open calculatorThermal & Fluids
Rankine Cycle Efficiency Calculator
Steam Rankine η_th, work, heat, back-work ratio, and exit quality from plant P/T or steam-table enthalpies.
Open calculatorThermal & Fluids
Heat Exchanger LMTD Calculator
LMTD, heat duty, required area, and UA for counterflow or parallel flow.
Open calculatorThermal & Fluids
Pipe Flow Pressure Drop Calculator
Darcy–Weisbach or Hazen–Williams pressure drop with fittings K, elevation, Reynolds number, and friction factor.
Open calculatorThermal & Fluids
Heat Transfer Calculator (Conduction)
Conduction heat rate, thermal resistance, and heat flux through a plane wall.
Open calculatorThermal & Fluids
Pump Power Calculator
Hydraulic, shaft, and electrical pump power from flow, head or pressure, density, and efficiencies.
Open calculatorEV & Renewable Calculators
Battery sizing, solar panel tilt, wind turbine performance, and EV drivetrain estimates.
EV & Renewable
EV Battery Pack Sizing Calculator
Usable and installed pack energy, Ns×Np cell layout, pack Ah, and discharge power from range, efficiency, and cell specs.
Open calculatorEV & Renewable
Motor Torque-Speed and Efficiency Calculator
EV torque-speed curve or point convert with the 9550 rule, electrical input, and optional DC current. Metric or Imperial.
Open calculatorEV & Renewable
Regenerative Braking Energy Calculator
Recovered energy, range added, and pack share from braking ΔKE or downhill PE. Metric or Imperial.
Open calculatorEV & Renewable
Solar Panel Tilt Optimizer
Year-round, winter, and summer panel tilt from latitude with Landau mid-latitude forms, plus facing azimuth. Browser-local.
Open calculatorEV & Renewable
Wind Turbine TSR and Cp Calculator
Measure tip-speed ratio and Cp from rotor data, or estimate electrical power from Cp and drivetrain efficiency. Metric or Imperial.
Open calculatorUtilities Calculators
Scientific calculator and engineering unit converter.
Utilities
Scientific Calculator
Online scientific calculator for Deg/Rad trig, powers, roots, logs, factorial, Ans, memory, and a reusable history panel.
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Unit Converter
Convert area, data rate, digital storage, energy, force, frequency, fuel economy, length, mass, angle, power, pressure, speed, temperature, time, and volume.
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