Construction calculators that get the numbers right — the first time.
Free, accurate calculators for roofing, masonry, framing, decking, fencing, and interior finishing — built for contractors and DIYers. No spreadsheets, no guesswork — just accurate material estimates in seconds.
- Calculators
- 21
- Price
- $0
- Speed
- Instant
Calculators
Always free
Live results
Every calculator, one job site
Built around the materials estimates contractors and DIYers look up most.
Roofing
Masonry & Landscaping
Concrete Calculator
Calculate cubic yards and bags of concrete needed
Calculate nowGravel Calculator
Estimate tons and cubic yards of gravel for any area
Calculate nowMulch Calculator
Work out cubic yards and bags of mulch for your beds
Calculate nowTopsoil Calculator
Cubic yards, tons, and bags of topsoil for any area
Calculate nowCinder Block Calculator
Blocks and mortar bags for a CMU wall build
Calculate nowRetaining Wall Calculator
Blocks, rows, and cap units for your wall build
Calculate nowAsphalt Calculator
Tons and cubic yards of asphalt for your driveway
Calculate nowRebar Calculator
Grid spacing, linear feet & sticks for a slab
Calculate nowDecking & Fencing
Interior
Paint Calculator
Know exactly how many gallons of paint to buy
Calculate nowFlooring Calculator
Square footage and boxes needed, with waste factored in
Calculate nowInsulation Calculator
Rolls or batts needed for any wall or ceiling area
Calculate nowBlown-In Insulation Calculator
Bags needed for attic cellulose or fiberglass insulation
Calculate nowBaseboard Calculator
Linear feet and pieces of trim for any room
Calculate nowHow it works
Three steps between you and an accurate materials list.
Pick your calculator
Choose from roofing, masonry, framing, decking, fencing, or interior calculators.
Enter your measurements
Type in the dimensions you already have — length, width, depth, or rise and run.
Get instant results
See exact quantities, costs, and material counts update live as you type.
Every formula on CalcRafter mirrors the math contractors already use — we just do the arithmetic instantly so you can focus on the build.
Frequently asked questions
Yes — every calculator on CalcRafter is 100% free, with no sign-up, email gate, or account required. Just open a page and start calculating.
Each calculator uses standard industry formulas (the same math contractors use) based on the measurements you enter. Real-world results can vary with waste, site conditions, and material brand, so we build in sensible rounding and recommend adding a 5–10% buffer for material orders.
No. Every calculator runs instantly in your browser — no downloads, plugins, or spreadsheets required.
Yes, every calculator is fully responsive and built to be used one-handed on a phone while you're measuring on site.