Mechanical Engineering Calculators

Compression Spring Calculator

Rate, Wahl-corrected stress, solid height and buckling, with built-in material data.

Spring Rate Calculator

Spring rate (spring constant) from wire size, coil diameter and material.

Extension Spring Calculator

Rate, spring index and force at extension including initial tension.

Spring Constant Calculator

Spring constant from two measured load/deflection points (Hooke’s law).

Involute Gear Calculator

Tooth geometry from module/DP and pressure angle, with a tooth-profile render and DXF export.

Gear Ratio Calculator

Gear ratio with output RPM, torque and vehicle speed from tire size.

Gear Module Calculator

Module from pitch diameter and teeth, with diametral and circular pitch.

Gear Tooth Ratio Calculator

Single- or two-stage gear-train ratio and output speed from tooth counts.

Planetary Gear Calculator

Epicyclic gear ratio for ring-, sun- or carrier-fixed arrangements.

Worm Gear Calculator

Worm drive ratio, center distance, lead angle and self-locking check.

True Position Calculator

GD&T true position from X/Y deviation with MMC bonus tolerance and a pass/fail check.

MMC Bonus Tolerance Calculator

MMC/LMC bonus tolerance from a feature’s departure from its material limit.

Composite Position Tolerance Calculator

Two-tier PLTZF/FRTZF position check from X/Y deviation.

Flatness Tolerance Calculator

Flatness (surface form) from measured points, with a pass/fail check.

Hole & Shaft Fit Calculator

ISO 286 hole-basis clearance-fit limits and clearance (H7/g6, H8/f7, …).

Press Fit / Interference Calculator

Interference-fit contact pressure, assembly force, torque capacity and hub stress (Lamé).

Cylindricity & Runout Calculator

Runout (TIR) and cylindricity zone from indicator and diameter readings.

Surface Feet per Minute Calculator

Cutting speed (SFM / m·min) and diameter to spindle RPM, with cutting speeds by material.

Bore & Stroke Calculator

Engine displacement (cc / L / ci) and bore/stroke ratio from bore, stroke and cylinders.

Tap Drill Size Calculator

Tap drill diameter for any metric or unified thread at your chosen % thread engagement.

Keyway Dimension Calculator

Standard parallel key & keyway dimensions for a shaft per DIN 6885-1.

Hydraulic Cylinder Force Calculator

Push and pull force with the rod-area differential shown explicitly. Standard ISO bores.

Hydraulic Pump Flow & HP Calculator

Pump output flow and hydraulic/shaft power from displacement, speed and pressure.

Pneumatic Air Consumption Calculator

Free-air consumption per cycle and per minute for a pneumatic cylinder.

Pulley Calculator

Pulley ratio, driven RPM and belt speed from pulley diameters.

Sprocket Calculator

Sprocket ratio, RPM, chain speed and pitch diameters for a chain drive.

Belt Length Calculator

Two-pulley belt length and wrap angle from center distance and diameters.

Chain Length Calculator

Roller-chain length in links and mm from sprocket teeth and center distance.

Bearing Life (L10) Calculator

Basic L10 rating life in revolutions and hours from load, speed and rating.

Bolt Preload & Torque Calculator

Clamp force (preload) from tightening torque and the nut factor.

Bolt Circle Coordinate Calculator

X-Y hole coordinates and spacing on a bolt circle, with a layout render.

Fillet Weld Size Calculator

Effective throat and weld capacity from leg size, length and electrode (AWS/AISC).

Bend Allowance Calculator

Bend allowance, deduction and setback from angle, radius, thickness and K-factor.

Bend Deduction Calculator

Flat (blank) length and bend deduction for a press-brake bend.