Solar Panel Sizing Calculator
LiveCalculate panels, batteries, inverters, charge controllers, and wire gauge for home solar systems and van/RV builds. Works worldwide with regional sun hour data.
Open calculator →Deck & Fence Material Estimator
Coming SoonEnter your dimensions, pick your material (pressure treated, composite, cedar), and get a complete materials list with quantities and costs.
Coming soonAquarium Setup Calculator
Coming SoonSize your filter, heater, lighting, and substrate for freshwater, saltwater, or reef tanks. Stocking calculator included.
Coming soonHome Gym Equipment Calculator
Coming SoonEnter your space, budget, and training goals. Get a complete equipment list across three price tiers with product recommendations.
Coming soonElectrical Wire & Breaker Calculator
Coming SoonCalculate wire gauge, breaker size, and conduit for any circuit. Handles voltage drop over distance for residential and shop wiring.
Coming soonWhy these calculators exist
Every tool on this site solves the same problem: you're about to spend real money on a project and you need to know exactly what to buy. Not roughly. Not "it depends." The actual quantities, sizes, and specs for your specific situation. We built these calculators because we got tired of vague advice and wanted tools that give straight answers backed by real math. Every calculator is free, works on any device, and links to the products you'll actually need.