24 practical engineering tools + formula library
Use transparent first-pass calculators for machine design, mechanics, tolerances, DFM, materials and manufacturing. Inputs stay in your browser; no project data is uploaded to a server.
Power transmission, bearings & stability
New first-pass tools for rotating machinery and structural stability.
Power · Torque · Speed
Solve the ideal rotating-machine relationship.
New V0.8Spur Gear Pair
Ratio, pitch geometry and output speed.
New V0.8Belt & Pulley
Speed ratio, belt speed and approximate open-belt length.
New V0.8Bearing L10 Life
Basic rating life from C, P and speed.
New V0.8Euler Column Buckling
Elastic critical load and slenderness.
New V0.8Factor of Safety
Explicit strength-to-stress screening.
Engineering analysis · New V0.7
Mechanics calculators for first-pass sizing. Use them to make assumptions visible before detailed verification.
Beam Deflection & Bending
Four idealized beam cases with moment, deflection and nominal stress.
New V0.7Section Properties
Area, I and section modulus for common sections.
New V0.7Shaft Torsion
Circular-shaft shear stress, polar moment and elastic twist.
New V0.7Compression Spring
Spring rate, deflection, index and corrected wire stress.
New V0.7Engineering Unit Converter
Length, force, pressure, torque, energy, power and temperature.
New V0.7Formula Library
Search common mechanical relationships and their assumptions.
Design intent & release
Tools for tolerancing, drawings, fasteners and interfaces.
Manufacturing & DFM
Choose processes and run preliminary manufacturability checks.
Manufacturing Process Selector
Rank candidate manufacturing routes from concept inputs.
DFMInteractive DFM Checklist
Structured checks for molding, CNC, sheet metal and FDM.
MoldingDraft Angle Calculator
Convert depth and draft into dimensional offset.
MoldingMolding Shrinkage Calculator
Estimate cavity dimensions from nominal shrinkage.
Materials, fits & additive
Material decisions and dimensional interfaces.
Material Finder
Filter the material library by design priorities.
MaterialsMaterial Comparison
Compare two library materials side-by-side.
FitsPress / Clearance Fit Calculator
Calculate min/max clearance or interference from limits.
ToleranceTolerance Stack Calculator
Worst-case and RSS dimension chains.
Additive3D Printing Clearance Calculator
Starting clearance guidance for common print processes.
Need the equations behind the tools?
Open the searchable formula library and printable reference desk.