40 free calculators and one reference chart for home and yard projects. Browse by topic or search for a tool.
Measurements and conversions
Area, length and unit conversions
Trapezoid area calculatorArea from two parallel sides and perpendicular height, with US and metric inputs.Triangle area calculatorArea from base and perpendicular height, with US and metric inputs.Circle area and circumference calculatorArea and boundary length from diameter or radius, with US and metric inputs.Fraction to decimal inches calculatorConvert fractional inches, decimal inches and millimeters, with a visible rounding difference.Square footage calculatorArea of one or two rectangles, in square feet, yards and meters.
Concrete, gravel and paving
Slabs, bases, blocks and paving
Concrete calculatorCubic yards and the number of 40 lb and 80 lb bags for a slab.Gravel calculatorCubic yards, tons and optional material cost for a driveway, path or base.Asphalt calculatorCubic yards and US short tons of hot-mix for a driveway, with optional cost.Sealcoating calculatorHow many 5-gallon buckets of sealer a driveway needs, with optional cost.Driveway cost calculatorInstalled cost range by area and material: gravel, asphalt, concrete or pavers.Patio cost calculatorMaterial-based patio estimates on prepared ground, with removal priced separately.Concrete bags by slab size chartQuick table of bags needed for common slab sizes.Gravel cubic yards to tonsConvert gravel volume to weight with your supplier figure.Paver base calculatorBase stone, sand and paver count for a patio or walkway.Retaining wall block calculatorBlocks per course, courses and total blocks.
Lawn, garden and drainage
Soil, planting materials and water
Mulch calculatorCubic yards and bags for a garden bed.Mulch cost calculatorMulch needed and cost three ways: bulk, installed, or bagged.Topsoil and fill dirt calculatorCubic yards and tons of topsoil or fill dirt.Sod calculatorRolls of sod for a lawn.Sod cost calculatorSod material, installed cost and old lawn removal by lawn area.Grass seed calculatorPackaged seed pounds or pure live seed, with optional whole-package count.Mulch bags vs bulk costCompare bagged and bulk mulch using your own prices.French drain calculatorGravel, collecting pipe, full-wrap fabric and drop for one straight drain run.Pool and pond water volumeGallons to fill and fill time.
Floors, walls and paint
Rooms, surfaces and finishes
Paint calculatorGallons of paint for a room, minus doors and windows.Deck painting cost calculatorPainting estimates for paint-compatible surfaces, with US/metric area and separate prep references.Tile calculatorTiles to buy for a floor or wall.Flooring calculatorBoxes of flooring for a room.Drywall calculatorSheets of drywall for a room.Insulation calculatorPackages of insulation for a wall or attic.
Fences, decks, roofs and structures
Outdoor builds and framing
Fence post concrete calculatorConcrete per post hole, total, and bags to buy.Fence picket and board calculatorPickets, posts and rails for a straight fence.Fence cost calculatorInstalled fence cost by linear feet and material.Deck board calculatorDecking boards for a deck of a given size.Deck cost calculatorCompare installed deck and materials-only estimates separately by area.Roofing shingle calculatorRoof area, squares and shingle bundles.Stair stringer calculatorRisers, equal rise, run and a planning diagonal, not a cut-ready stringer.Gutter calculatorSections, provisional outlet count and hangers from your selected spacing.Shed gravel pad calculatorGravel volume for a rectangular shed pad with your selected extension and depth.Foundation footing concrete calculatorConcrete for a uniform rectangular footing using centerline dimensions.Board foot calculatorBoard feet and cost for lumber.
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Results are estimates only. Confirm quantities and prices with your supplier before you order. See how we calculate for units, waste percentages and rounding. Looking for explanations? Browse the DIY guides.