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Explore all tools →60+ free calculators for concrete, asphalt, gravel, roofing, and more — built on real construction formulas, with outputs you can actually take to the supplier.
"Clear assumptions and easy to use. The gravel calculator saved me from over-ordering."
— Kevin D., New York
Home Project Calculator is a growing library of estimation tools for concrete, asphalt, aggregates, roofing, lumber, and interior projects. Each calculator reflects practical job-site conditions — waste factors, compaction, thickness, and unit conversions — so the number you get is one you can actually order against.
Jump into a category to find the right calculator faster.
Slabs, footings, bags, rebar, and brick estimates.
Asphalt, milling, bitumen, pavement, and driveway costs.
Gravel, sand, stone, soil, mulch, compost, and pavers.
Roof area, pitch, trusses, and shingles.
Lumber counts, board feet, studs, decks, stairs, and plywood.
Drywall, tile, wallpaper, paint, flooring, and curtains.
Fence cost, post depth, and picket layout planning.
Epoxy and resin coverage for floors and coatings.
Water softeners and recessed lighting layout.
Tonnage, coverage, waste, and compaction helpers.
Asphalt & PavingEstimate asphalt material and installation costs by area and thickness.
Asphalt & PavingCubic yards/meters, bags, trucks, and rebar hints.
ConcreteEstimate concrete material and labor costs for slabs, pads, and pours.
ConcreteVolume, weight, and coverage by area & depth.
Aggregates & LandscapingEstimate gravel material and delivery costs by volume and weight.
Aggregates & LandscapingEstimate material & labor costs for new driveways.
Asphalt & PavingReclaimed asphalt volume, reuse & truckloads.
Asphalt & PavingTons, cubic yards, and bag counts for sandboxes, patios, and paver bases.
Aggregates & LandscapingEstimate stone volume, coverage & delivery loads.
Aggregates & LandscapingBrick counts, mortar estimates & wall sizing.
ConcreteSheets required, waste factor & cost estimates.
Lumber & FramingArea, thickness & material quantity planning.
Asphalt & PavingVolume & weight for mixed aggregate materials.
Aggregates & LandscapingCoverage by area & depth; parts A/B guidance.
Coatings & ResinsSoil volume for beds, lawns & planters.
Aggregates & LandscapingEstimate topsoil costs for lawns, beds, planters, and landscaping jobs.
Aggregates & LandscapingBinder amounts by mix & coverage rate.
Asphalt & PavingSheets, joint compound & fastener counts.
InteriorEstimate drywall sheets, compound, fasteners, and install costs.
InteriorPaver count, sand & base aggregate needs.
Aggregates & LandscapingSelf-level or thin-film coverage by area & depth.
Coatings & ResinsMaterial & install costs by length & style.
Fencing & Outdoor StructuresTile count, boxes & waste allowance by area.
InteriorEstimate tile, adhesive, grout, waste, and installation costs.
InteriorRolls needed by wall size & pattern repeat.
InteriorSquares, bundles & waste by roof area & pitch.
RoofingStud counts by wall length, height & spacing.
Lumber & FramingMaterial & labor costs by room size & coats.
InteriorBoards, joists, posts & fasteners with waste.
Lumber & FramingEstimate deck board, framing, footing, and installation costs.
Lumber & FramingCompost volume & mix ratios for beds & bins.
Aggregates & LandscapingCalculate roof area, roofing squares, and shingle bundles from house dimensions.
RoofingTreads, risers & stringer layout from rise/run.
Lumber & FramingBoard counts by size, length & waste factor.
Lumber & FramingCubic yards/meters, coverage depth, and garden tips.
Aggregates & LandscapingEstimate mulch material and delivery costs by bed size and depth.
Aggregates & LandscapingBoard feet, cost estimates, and lumber sizing help.
Lumber & FramingPitch angle, rise and run, and roofing material guide.
RoofingHow many bags of concrete do you need? Enter dimensions for an instant count.
ConcreteQuickly calculate truss spacing, lengths, and roof coverage.
RoofingDetermine the correct depth for stable and secure fence posts.
Fencing & Outdoor StructuresPlan your picket fence layout, spacing, and total materials needed.
Fencing & Outdoor StructuresFind the right water softener capacity for your household usage.
Home SystemsRod width, panel width & length with fullness.
InteriorFixture count, spacing & quick grid layout.
Home SystemsBar count, total length & steel weight.
ConcreteBoxes to buy, waste, rows & last-row width.
InteriorEstimate flooring materials, underlayment, waste, and installation costs.
InteriorFooting volume for pads, strips & post holes.
ConcreteExcavation volume, swell factor, fill needs, and truckload estimates.
Aggregates & LandscapingBlocks, base material, drainage gravel, backfill, and excavation planning.
Aggregates & LandscapingEstimate block, base, drainage, backfill, and install costs.
Aggregates & LandscapingCoverage, packs, rolls, and waste for walls, ceilings, and floors.
InteriorEvery calculator is built around documented formulas, clearly stated assumptions, and reference-backed planning logic — not a black box.
Each calculator is built around documented formulas, defined unit conversions, and practical assumptions for construction and home improvement planning.
Read the methodologyMaterial densities, coverage estimates, and sizing guidance are anchored to reference data, industry conventions, and clearly stated source logic.
See the data sourcesWe publish who reviews the calculators, what is checked, and how updates are handled — so the trust signal comes from process, not a badge.
Meet the review boardWant the broader picture of how estimating works across the site? Read the full calculation guide
Home Project Calculator is written and maintained by K. Lynch, a hands-on DIYer who kept running into calculators that gave answers without explaining the assumptions behind them. Calculators covering structural, roofing, and electrical topics are additionally reviewed by licensed professionals before publishing.
Read K. Lynch's story and see the projects behind the numbers →
These pages explain how the calculators are built and supported — for when a quick estimate isn't enough.
A complete guide to how home project estimates work, including formulas, assumptions, measurements, and planning logic across materials and project types.
Step-by-step checklists that turn rough estimates into organised project plans before materials are ordered.
Quick-access charts and lookup tables for dimensions, conversions, coverage rates, and planning benchmarks.
A dedicated place to review the default assumptions that influence estimates across different calculators.
The person behind the site, the projects that shaped it, and how the content gets reviewed.
Have a tool in mind? Request a calculator or improvement and help shape what gets built next.
Occasional emails with how-tos, coverage charts, and new calculators.