Get the number. Move on.
Free engineering calculators for workshop, desk, and classroom. Built and checked by one engineer.
Pick a discipline
Jump straight to structural, shop-floor, electronics, or general tools. Each card opens the full catalog filtered for that area.
Applications & manufacturing
Full browser apps for CNC, simulation, and production workflows.
Start with CAM Studio
Strength & structures
Beams, stress, sections, and pressure vessels.
Start with Beam stress & deflection · 7 tools
Motion & vibration
Forces, resonance, damping, and kinematics.
Start with Centrifugal force · 6 tools
Applied & shop tools
Machining, seals, fits, and thermal growth.
Start with Speeds & feeds · 8 tools
Electronics
Circuits, networks, and passive components.
Start with Voltage divider · 5 tools
General engineering
Units, materials, and geometry helpers.
Start with Unit conversion · 5 tools
When a calculator is not enough
CAM, structural FEA, and seal sizing ship with Pro. Every free calculator stays free.
Pro
Browser-based CNC
CAM Studio
Import geometry, generate 2.5D and 3D toolpaths, simulate cuts, and post G-code in the browser. Tool libraries sync to your account.
- 2.5D & 3D paths
- G-code post
- Cloud tool library
Pro
Structural FEA in 2D
Bridge Designer
Pick a truss, arch, cable-stayed, or suspension style, sketch members, and run a 2D frame solver for axial forces, bending, and load factor.
- 12 bridge styles
- Load factor check
- Interactive canvas
Pro
Seal groove sizing
O-ring Calculator
Size grooves to ISO 3601 and AS568, check squeeze and stretch, and pick compatible materials.
- ISO & AS568
- Squeeze analysis
- Material library
Compare Pro plans
Pro adds the solvers above plus PDF export and saved workspaces.
Built by one engineer
Every formula, input check, and layout gets personal attention. No committee and no filler on the page.
Formulas you can defend
Industry-standard equations, validated inputs, and reference cases checked against handbook values. Numbers you can cite on a drawing.
Try beam stressFast on desk or shop floor
Clear inputs, immediate results, and diagrams where they help. No account needed for the free tools.
Unit conversionShipped by one engineer
New tools and fixes land regularly. Feedback from people doing real work drives what gets built next.
About the projectStart with a free calculator
Pro adds CAM Studio, Bridge Designer, O-ring sizing, PDF export, and saved workspaces. Compare plans when you need those.
Calculations are for reference only. Check results against your project requirements and applicable standards.