Structure
Quantities for the parts that carry load — footings and slabs, base material, framing members, and the roof over them.
Systems
Sizing and capacity for what runs inside the walls — pipe, wire, ductwork, and the insulation around them.
Finishing
Surface coverage and material counts for the finish work — board, paint, and floor coverings.
Which calculator do you need?
Almost no job uses just one of these. The list below groups them the way the work actually runs, so you can see which pair or trio you are going to need before you start measuring.
- Pouring a slab, footing or pier. Volume, bag count and ready-mix yards come from the concrete calculator. The compacted base underneath it is a separate order — size it with the gravel calculator.
- Framing a floor or a ceiling. The joist calculator gives the member count and board feet once you already know the size and spacing. The lumber calculator handles studs, plates and the nominal-versus-actual sizes that decide what fits.
- Getting a roof on. Squares, bundles and underlayment come from the roofing calculator, which is also where the slope limits that rule out asphalt shingles live.
- Rough-in, before anything closes up. Pipe sizing and drain slope are in the plumbing calculator, circuit load and voltage drop in the electrical calculator, and duct and equipment sizing in the HVAC calculator.
- Closing the walls in. Cavity fill and approximate R-value come from the insulation calculator; sheet count, screws and compound from the drywall calculator.
- Finishing. Coverage by coat is in the paint calculator, and boxes, waste factor and layout in the tile and flooring calculator.
What these tools do, and what they do not
- They count material, not structural adequacy. Nothing here decides whether a member is big enough. Span, size and spacing come from your local code's tables or an engineer — the calculators tell you how much to order once that is settled.
- Waste is included, and it is stated. Where a tool applies a waste factor, the results panel says so and the formula box shows it. Order figures and raw figures are labelled separately rather than quietly merged.
- Local amendments always win. Every code figure on this site is a model-code value. Jurisdictions amend them, editions differ, and some assemblies override the general case. Each calculator links the primary source so you can check the version that applies to you.
- Nothing leaves your device. Recent calculations, saved results and projects are stored in your browser only. There is no account and nothing is uploaded — see the Privacy Policy.
- They work on a phone, on site. Every calculator switches between imperial and metric, and the reference tables and worked examples stay readable even with JavaScript turned off.