Free Sizing Calculators

Calculate panels, batteries, inverters, charge controllers, and wire gauge for home solar systems and van/RV builds. Works worldwide with regional sun hour data.

Enter your dimensions, pick your material (pressure treated, composite, cedar), and get a complete materials list with quantities and costs.

Size your filter, heater, lighting, and substrate for freshwater, saltwater, or reef tanks. Stocking calculator included.

Enter your space, budget, and training goals. Get a complete equipment list across three price tiers with product recommendations.

Calculate wire gauge, breaker size, and conduit for any circuit. Handles voltage drop over distance for residential and shop wiring.

Find the right BTU rating and unit size for central air, mini-splits, and window units based on your space and climate.

Add your appliances, get the exact wattage and generator size. Home backup, jobsite, and portable generators.

Enter project dimensions, get cubic yards and bag counts. Slabs, footings, post holes, columns, and walls.

Enter room dimensions, get exact gallons for walls and ceiling. Accounts for doors, windows, coats, and primer.

Get the right R-value for your climate zone. Calculates quantities for batt, blown, spray foam, and rigid board.

Tile, hardwood, laminate, vinyl, and carpet. Get exact square footage, box counts, underlayment, and cost estimates.

Raised bed soil, compost, and amendment quantities. Single or multiple beds with cost comparison for bagged vs bulk.

Tank vs tankless comparison. Get the right gallon capacity or GPM flow rate based on your household and demand.

Squares, bundles, underlayment, ridge cap, drip edge, and nails. Asphalt shingles and metal roofing.

Enter test readings, get exact chemical doses. pH, chlorine, alkalinity, CYA, and calcium. Pool volume calculator built in.