Industry calculators
Free calculators for specialised fields
Purpose-built tools for the calculations professionals actually do — reviewed methods, cited standards, no sign-up.
Permanent way & track design
Rail Engineering
Calculators for track geometry, rail stress and permanent way design — built for track engineers, designers and maintainers.
6 calculators
- Cant Deficiency CalculatorEquilibrium cant, deficiency and excess for a curve — from speed, radius and applied cant.
- Rail Thermal Expansion CalculatorFree expansion of jointed rail, and the axial force locked into CWR, from temperature change.
- Curve Speed CalculatorMaximum permissible speed through a curve — from radius, applied cant and your deficiency limit.
Cables, circuits & power systems
Electrical Engineering
Calculators for cable sizing, voltage drop, circuit protection and power system design — metric mm² and AWG, for electricians and electrical designers anywhere.
4 calculators
- Voltage Drop CalculatorVolts and percent dropped in the run, power lost in the cable, and the smallest conductor that still meets your limit.
- Cable Ampacity & Derating CalculatorYour standard supplies the base rating and the correction factors; this applies the chain and tells you whether the cable still carries the load.
- Conduit Fill CalculatorFill percentage, spare capacity and jam ratio for any conduit and any mix of cables.
Structures, concrete & site works
Civil & Structural
Calculators for beam design, concrete quantities, reinforcement and site earthworks — first-principles structural mechanics with metric and imperial units.
3 calculators
- Beam Deflection & Bending CalculatorDeflection, moment, shear and bending stress for the five standard beam cases — with the span/N ratio you actually check against.
- Concrete Volume CalculatorNet volume, over-order allowance, mass, truck loads and bag counts for slabs, footings, columns, piers and stairs.
- Rebar Weight & Area CalculatorBar area, kg/m, total tonnage — and the mm²/m at a given spacing that your design requirement is written against.
Fasteners, shafts & power transmission
Mechanical Engineering
Calculators for bolted joints, shaft power, gearing and machine elements — the everyday mechanical design checks, in metric and imperial units.
2 calculators
- Bolt Torque & Preload CalculatorTarget preload to tightening torque — short-form nut factor or the full friction decomposition, with the scatter band that torque control actually delivers.
- Shaft Power, Torque & Speed CalculatorP = T·ω solved either way — plus efficiency, service factor, torsional stress, twist and minimum shaft diameter.
Cargo volume, weight & load planning
Freight & Logistics
Calculators for chargeable weight, CBM, container and pallet loading — the numbers freight forwarders, shippers and warehouse planners quote every day.
4 calculators
- Chargeable Weight CalculatorVolumetric weight vs actual gross weight — which one the carrier bills you on, and by how much.
- CBM CalculatorDimensions × quantity → CBM, CFT, weight and how much of a container that actually is.
- Container Load CalculatorCartons per container by orthogonal block stow — with the stacking limit, the payload limit, and which one actually governs.
Process capability, sampling & reliability
Quality Engineering
Calculators for OEE, process capability, sigma level, sampling plans and reliability — the ISO-style methods behind manufacturing quality management.
4 calculators
- OEE CalculatorAvailability × Performance × Quality from one shift record — plus TEEP and the time lost to each of the six big losses.
- Cp, Cpk, Pp & Ppk CalculatorPotential capability and actual performance from one set of spec limits — plus the centring index and the defect rate each tail implies.
- DPMO & Sigma Level CalculatorDefects per million opportunities, rolled throughput yield and process sigma from a defect count.
Running costs, payback & emissions
Energy & Sustainability
Calculators for solar payback, appliance running costs and energy economics — you supply your own local tariff, so the answer is right wherever you are.
2 calculators
- Solar Payback CalculatorYear-by-year cashflow with degradation and tariff escalation — payback, lifetime saving, LCOE and IRR from your own local numbers.
- Appliance Running Cost CalculatorEnergy, cost and carbon for one appliance — with the standby draw and duty cycle that most calculators leave out.