Every calculator on this site is free, needs no sign-up and uses 2026 US cost data for all 50 states. Start with the main home building cost calculator, or pick a tool for a specific build type, part of the house or financing question.
Cost calculators
Home building cost calculatorTotal cost by size, state, finish and featuresCost per square footTurn a total into a rate, or a rate into a totalBuild vs buyCompare building with buying an existing home
Build type calculators
BarndominiumShell kit or turnkeyTiny houseOn wheels or a foundationADUDetached, attached or garage conversionModular homeFactory-built sectionsGarage1 to 3 cars, attached or detached
Component calculators
Financing calculators
How accurate are these calculators?
Our calculators give a planning estimate, typically within 15–20% of real quotes for a standard build. They use state cost-per-square-foot data and NAHB’s national cost breakdown, adjusted for your choices. Local labor markets, lot conditions and design details can move the real price, so use the estimate to set a budget and then get bids. Read the full methodology.