Free tools for the trades, shop & farm
The math behind
the job.
Quick, accurate calculators for tree work, woodworking, electrical, building, fabrication and the farm. Every answer shows its formula and a worked example, so you can check it yourself.
Browse by trade
86 calculators · 8 trades- 8 calcsTree CareAppraisal, log weight, rigging loads.
- 14 calcsWood & WoodworkingBoard feet, log scale, firewood, wood movement, CNC.
- 16 calcsElectricalVoltage drop, conduit fill, RC circuits, solar sizing.
- 12 calcsBuilding & CarpentryRafters, retaining walls, R-value, snow load.
- 10 calcsPlumbing & HVACFriction loss, pump head, gas pipe, duct, refrigerant.
- 9 calcsMechanical & HydraulicCylinders, pulleys, sling angles.
- 6 calcsMetal & FabricationBend allowance, weld volume, bolt circles.
- 11 calcsFarm & RuralSprayer calibration, fertilizer blends, drain tile.
Missing a calculator? Suggest one.