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Trade calculators for field math that needs to be right

Sizing, load, flow, and code checks you can run from a phone on the job before the next cut, pull, pour, or load.

376 calculators across 21 trades. Free, no login.

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Start from the job

Common field checks

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Electrical run

Can it run, what wire, what generator?

Before you pull wire for a new load.

  1. Can I Run This On That? Check breaker and conductor capacity first. NEC 110.14(C) ties ampacity to the equipment terminal temperature rating.
  2. Wire Sizing Calculator Pick the conductor after load and distance are known. The NEC informational note points to 3 percent branch-circuit voltage drop for efficient operation.
  3. Generator Sizing Calculator Check backup power against starting load. Motors and compressors can pull several times running watts during startup.
Shop feed

Long run, shop load, backfeed risk.

Before trenching or putting a generator on a shop.

  1. Long-Run Voltage Drop Calculator Long feeders lose voltage with length and current. Aluminum needs a larger conductor than copper for the same drop target.
  2. Machine Shop Power Budget Calculator Total the likely simultaneous machine load. A shop can have enough connected horsepower to exceed the feeder even when only some tools run together.
  3. Generator Backfeed Safety Checker Backfeed risk is a transfer problem. A listed transfer switch or interlock is what separates generator power from utility lines.
Grain handling

Bin volume, shrink, drying, auger size.

Before harvest math turns into a bottleneck.

  1. Grain Bin Capacity Calculator Start with physical storage. A 30 ft diameter bin adds about 707 square feet of floor area for each foot of grain depth.
  2. Grain Moisture Shrink Calculator Drying removes water weight before saleable bushels are counted. Shrink changes the bushels you can actually sell.
  3. Grain Drying Cost Estimator Drying cost moves with points of moisture removed, fuel price, and airflow time, not just wet bushels.
  4. Auger & Conveyor Sizing Calculator Inclined augers move less than their horizontal rating. Match the angle-corrected capacity to the truck or bin flow.
Safety setup

Isolation, noise dose, trench slope.

For jobs where the control is part of the work.

  1. Lockout/Tagout Permit Manager OSHA 1910.147 requires hazardous energy isolation before servicing and maintenance work.
  2. Noise Dose & TWA Calculator OSHA 1910.95 uses a 90 dBA permissible exposure limit with a 5 dB exchange rate for dose calculations.
  3. Trench Volume & OSHA Sloping Calculator OSHA 1926.652 requires a protective system for trenches 5 ft or deeper unless the excavation is entirely in stable rock.
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The real shape of the library

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Shops & Outbuildings Shop Heater BTU Sizing Calculator, Long-Run Voltage Drop Calculator, Shop Air Compressor Sizing Calculator 87 tools Industrial Air Compressor Leak Calculator, System Chain Analyzer, Hydraulic Cylinder Force & Speed Calculator 44 tools Safety Lockout/Tagout Permit Manager, Noise Dose & TWA Calculator, Trench Volume & OSHA Sloping Calculator 37 tools Electrical Wire Sizing Calculator, Can I Run This On That?, Panel Load Study 35 tools Productivity Markup vs Margin Calculator, Hourly Burden Rate Calculator, Shift Schedule Generator 25 tools Machinist Chip Load Calculator, Thread Pitch Identifier, Tolerance & Fit Calculator 23 tools HVAC Heat Load from Bills Calculator, Duct Sizing Calculator, Superheat & Subcooling Calculator 20 tools Emissions Fuel Combustion Emissions Calculator, Refrigerant Leak CO2 Equivalent Calculator, Title V Permit Fee Calculator 19 tools Municipal Chemical Dosing Calculator, Detention Time Calculator, Disinfection CT Value Calculator 16 tools Geology & Drilling Hydrostatic Pressure Calculator, Equivalent Circulating Density Calculator, Annular Velocity Calculator 12 tools Agriculture Grain Bin Capacity Calculator, Grain Moisture Shrink Calculator 10 tools Hauling Cost Per Mile Calculator, Fuel Surcharge Calculator 8 tools Residential Paint Coverage Calculator, Tile & Flooring Calculator 6 tools Solar & Renewables Solar Array Sizing Calculator, Battery Bank Sizing Calculator 6 tools Structural Wood Beam & Joist Span Calculator, Wind Load Calculator (ASCE 7) 6 tools Foodservice Commercial Hood Exhaust Sizing Calculator, Grease Interceptor / Trap Sizing Calculator 5 tools Hardscaping Retaining Wall Geogrid & Block Calculator, Aggregate Compaction Shrink Calculator 5 tools Marine ABYC DC Wire Sizing & Voltage Drop Calculator, Propeller Pitch & Slip Calculator 4 tools Arboriculture Green Log Weight Estimator, Dynamic Rigging Shock Load Calculator 3 tools Live Events Inverse Square Law / SPL Calculator, Projection Throw Ratio & Lens Calculator 3 tools Woodworking Wood Speeds & Feeds Calculator, Board Foot Calculator 2 tools
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Runs in your browser. No account, no popup ads. Use it as a field screen, then verify against the governing standard. ToolGrit is free; a $6 month of Pro (PDF and CSV export of your results) helps keep it running.