Engineering calculators that get the formula right
Precision engineering calculators for mechanical design and manufacturing
Gear Module Calculator (Metric Spur Gear)
Compute the complete geometry of a metric spur gear from any two known parameters. Module, number of teeth, pitch diamet...
Gears & DrivesBearing Life Calculator (L10 / L10h per ISO 281)
Estimate the rated rolling bearing life L10 in millions of revolutions and in operating hours using the ISO 281 basic ra...
MetrologySurface Roughness Converter (Ra / Rz / Rmax)
Convert between Ra, Rz, Rmax and RMS surface roughness parameters and map them to ISO 1302 grade numbers, ASME B46.1 val...
Sheet MetalSheet Metal Bend Allowance Calculator
Calculate bend allowance, bend deduction, outside setback and the flat blank length for a sheet metal bend. Uses the K-f...
Gears & DrivesBelt Drive Calculator (Speed Ratio and Belt Length)
Size a two-pulley belt drive: speed ratio, output rpm, belt speed, approximate belt pitch length and wrap angle on the s...
MaterialsMetal Weight Calculator (Bar, Tube, Plate, Sheet)
Compute the theoretical weight of common stock shapes in steel, stainless steel, aluminium, copper, brass, titanium and ...
MetrologyISO 286 Tolerance and Fit Calculator (H7/g6)
Look up upper and lower deviation limits for ISO 286 holes and shafts, and compute clearance or interference for a chose...
MaterialsCompression Spring Rate Calculator
Calculate the spring rate, force at a given deflection and solid height of a round-wire helical compression spring. Impl...
Threads & FastenersISO Metric Thread Calculator (Pitch, Minor and Stress Area)
Compute the basic geometry of an ISO metric thread from nominal diameter and pitch: pitch diameter d2, minor diameter d1...
Shafts & KeysParallel Key and Keyway Calculator (DIN 6885)
Look up the standard parallel key section, shaft and hub keyway depths for a given shaft diameter per DIN 6885, then che...
Threads & FastenersBolt Torque and Preload Calculator
Compute the assembly torque for a target bolt preload: tensile stress area from thread geometry, yield load from the pro...
MachiningCutting Speed and Feed Calculator (Turning and Milling)
Convert between cutting speed and spindle rpm, compute table feed from feed per tooth or per revolution, and estimate ma...
Beams & SectionsSection Properties Calculator (Second Moment of Area and Section Modulus)
Area, second moment of area (moment of inertia), section modulus and radius of gyration for rectangles, solid and hollow...
Beams & SectionsBeam Deflection Calculator (Simply Supported, Cantilever, Fixed)
Maximum deflection, bending moment, bending stress and shear force for simply supported, cantilever and fixed-fixed beam...
Fluid PowerHydraulic Cylinder Force Calculator (Push and Pull)
Extending and retracting force of a double acting hydraulic cylinder, from bore diameter, rod diameter and working press...
MetrologyTrue Position Calculator (GD&T Position Tolerance)
Convert measured X and Y coordinates into a true position deviation and compare it with the position tolerance from the ...
Tolerances & FitsInterference Fit Calculator (Press Fit Pressure and Stress)
Contact pressure, hoop stress and von Mises stress for a press or shrink fit between a shaft and a hub, worked out from ...
Shafts & KeysShaft Torsion Calculator (Shear Stress, Twist and Power)
Shear stress, angle of twist and torsional stiffness for a solid or hollow shaft carrying a torque, entered either direc...
Beams & SectionsColumn Buckling Calculator (Euler and Johnson)
Critical buckling load and critical stress for a compression member, using the Euler formula for slender columns and the...
Pressure VesselsPressure Vessel Thickness Calculator (ASME VIII Div 1)
Required shell thickness for a cylindrical or spherical pressure vessel to the ASME VIII Division 1 design formulas, inc...
Fluid PowerPipe Pressure Drop Calculator (Darcy-Weisbach)
Pressure drop through a straight pipe from the Darcy-Weisbach equation, with the friction factor from the iterated Coleb...
Fluid PowerOrifice Flow Calculator (Discharge Through an Orifice)
Flow rate through a sharp edged orifice from the pressure difference across it, using the incompressible orifice equatio...
MaterialsThermal Expansion Calculator (Growth and Thermal Stress)
Free thermal growth of a member over a temperature change, and the stress and force it develops when it is restrained. H...
Welding & JointsFillet Weld Strength Calculator
Load capacity of a fillet weld from the electrode classification, the leg size and the weld length, using the 0.6 FEXX s...
Contact MechanicsHertzian Contact Stress Calculator (Line and Point Contact)
Hertzian contact pressure and contact patch size for two parallel cylinders in line contact or two spheres in point cont...
Welding & JointsPin Shear and Bearing Stress Calculator
Checks a pin, rivet or bolt in single or double shear against three separate mechanisms: shear of the pin, bearing crush...
Gears & DrivesFlywheel Inertia, Energy and Speed Fluctuation Calculator
Moment of inertia, stored kinetic energy and speed fluctuation for a solid disc or a rimmed flywheel, from its dimension...
Gears & DrivesDisc Clutch and Brake Torque Calculator
Torque capacity of a single or multi plate friction clutch or brake, worked out on both the uniform pressure theory for ...
Shafts & KeysShaft Critical Speed Calculator (Whirling)
First and second lateral critical speeds of a shaft carrying a lumped mass or its own distributed weight, for simply sup...
MetrologyGear Span Measurement Calculator (Measurement Over Pins)
Span measurement over pins for an external spur gear, with the involute contact angle solved from the DIN 3960 relation,...