Calculators
Garage shop calculators
Every calculator runs in your browser and updates as you type. The electrical ones apply published NEC tables and say so: have a licensed electrician confirm before you wire anything.
01Layout and what fitsPick your garage size and the machines you want. See which fit with operator clearance, which do not, whether a parked car changes the answer, and the circuits the shop needs, drawn to scale.02Space left with a carEnter your garage and your vehicle. Get the space behind the nose, the strip beside the doors, the deepest bench that fits and the floor left in the other bays.03Workshop amps and subpanelEnter your biggest machines. Get the full-load amps from the NEC motor table, a demand estimate for one or two operators and the subpanel size to ask your electrician about.04240V circuit sizingHorsepower, voltage and run length in. Full-load amps, minimum ampacity, breaker, wire gauge with a voltage-drop check, and the receptacle type out.05240V outlet install costA transparent cost model for adding a 240V outlet in a garage. You enter the quotes and prices; it sizes the wire for the breaker and adds the pieces.06Voltage drop and cordsAmps, volts, length and gauge in; volts lost, percent drop and the smallest gauge that stays under 3 percent out. Works for extension cords and branch wiring.07Compressor CFMTell it which air tools run at once. Get the CFM at 90 PSI you need, the tank class, the motor size and whether it will run on 120V.08Dust collector and duct sizeTick the machines you own. Get the CFM you need, branch and main duct diameters from 4000 fpm, and which Grizzly collectors clear the bar.09Garage heater BTUDimensions, insulation and temperatures in. Heat loss in BTU per hour, the electric heater watts and breaker, and the gas input to look for.10Mini-split BTUFloor area, insulation, sun, people and the tools that run all day. Get the cooling load and the standard mini-split size to shop.11Shop lightingRoom size and the work you do in, lumens and fixture count out, with spacing and the amps the fixtures draw.12Air filtration ACHRoom volume and a target air-change rate in; the CFM you need, how many hanging filters, and the air changes each speed of a Grizzly G0738 gives.13Workbench height and depthYour height and your work in; the bench height for heavy, general and precision work, and a comfortable bench depth.14Workbench size for a garageGarage, vehicle and bench depth in. The longest bench that still leaves an aisle, for three depths.15Mobile base sizingMachine size and weight in; the base footprint, the load rating to shop for, the caster count and which listed base clears it.16Shop budget plannerPick a trade, a budget tier and your garage. Get a machine package, a budget band for the Amazon items, the Grizzly items to price direct, and whether it fits the bay.
