Technical calculators for design and engineering
Traceable calculations based on technical standards – with clear inputs, visual results, and documented assumptions.
Start with the task
Categories connect calculators that build on one another in a typical engineering workflow.
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Each calculator works independently and identifies the applied standard edition in its results.
Engineering Unit Converter
Convert length, force, torque, stress, temperature, and other engineering quantities through the shared SI core.
Modular Bolt Calculators
Tightening torque, preload, bolt stress, and proof load backed by one shared validated calculation core.
Shaft Diameter Pre-design
Estimate a smooth solid shaft from static bending and torsion.
ISO 273 Clearance Hole
Look up fine, medium, and coarse clearance holes for metric fasteners.
ISO 286 Fits Calculator
Determine limit sizes, deviations, minimum and maximum clearance for holes and shafts, including a dynamic fit visualization.
ISO 286 Tolerance Calculator
Determine deviations, tolerance width, and minimum and maximum size for one internal or external feature.
Metric Thread Calculator
Calculate basic dimensions, tolerance classes, and limit sizes for ISO metric coarse and fine threads to ISO 724, ISO 965, and ISO 261.
Cylindrical Gear Geometry
Calculate geometry and contact ratios for external spur and helical gear pairs according to ISO 21771.
Rolling Bearing Life
Dynamic and static bearing assessment with basic and modified rating life, safety factors, and reliability adjustment.
Parallel Key Calculator
Verify capacity and required length of a parallel-key connection to DIN 6892, Method C.
Interference Fit Calculator
Calculate joint pressure, elastic limits, torque, and axial capacity to DIN 7190-1.
EN 13906-1 Compression Spring
Calculate forces, spring rate, stresses, solid length, minimum coil clearance, and theoretical buckling safety for cylindrical compression springs.
Fit Selection Assistant
Narrow functional requirements step by step and compare calculated ISO 286 candidates.
Extension Spring Calculator
Calculate rate, forces, and body stress including initial tension.
Belleville Spring Calculator
Calculate nonlinear characteristics, stresses, and friction for individual discs, parallel packs, and series stacks to EN 16983/16984.
Section Properties
Calculate area, second moments, and section moduli for common sections.
Bending Stress
Determine nominal bending stress, utilization, and required section modulus.
Beam Deflection
Calculate reactions, moment, stress, and deflection for basic beam cases.