Construction & landscaping calculators
Work out exactly what you need.Then check what it should cost.
Free calculators for concrete, gravel, mulch, rebar and more — built to handle the details other tools skip. Compaction, lap splices, waste factors and post displacement all included.
Every number checked
Formulas verified against ACI, ASTM and AASHTO standards, and every figure in our tables is computed rather than copied.
The details that matter
Gravel compaction, rebar lap splices, post displacement, edge cover — the things that leave you short if a calculator ignores them.
Honest about limits
We publish ranges where sources disagree, cite where numbers come from, and say plainly when you need an engineer instead.
Concrete & Masonry
Volume, reinforcement and cost for slabs, footings and posts
Landscaping & Garden
Bulk materials by the yard, the ton and the bag
Interior & Finishes
Paint, drywall and trim, counted the way they are installed
Tiling & Flooring
Cartons, grout and the cuts that decide how it looks
Area & Conversion
The measurements everything else starts from
Brick & Masonry
Brick, block and mortar, counted by real coursing
Energy & Solar
System sizing, output and what it really saves
Pool & Water
Capacity, salt and chemical dosing
Built to be right, not just fast
Most material calculators do one multiplication and stop. That's fine until the detail they skipped is the one that leaves you standing in a driveway with a truck idling and not enough concrete.
Gravel loses 15–25% of its depth when you compact it. Rebar runs longer than 20 feet need lap splices you have to buy but never see. A 4×4 post displaces 11% of the concrete in its hole. Wire mesh sheets lap, so they don't cover their full 50 square feet. Every one of those is the difference between an order that works and one that doesn't — and every one is built into the calculators here.
We also publish the reasoning. Each calculator has a section explaining exactly what constants it uses and where they come from, plus the standards behind them. Where published sources genuinely disagree — and on things like driveway depth they do — we give you the range and the context rather than picking a number and stating it as fact.
Start with the measurement
Most projects begin with an area or a volume. Work that out first, then take it to whichever material calculator you need.
Square Footage Calculator →