All calculators
Grouped by the kind of job. Each one turns a measurement into a purchase quantity, shows the spare allowance it added, and links the specification the figures came from.
Yard & landscaping
Ground cover sold by the roll, the bag, the pallet or the cubic yard.
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Sod Calculator — How Much Sod or Turf You Need
Measure a lawn in rectangles and get the rolls, slabs or pallets of sod (turf) to order, with an adjustable allowance for cutting around beds and curves.
Confirm the quantity with your sod producer or garden center before you buy.
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Grass Seed Calculator — Pounds per Lawn
Pounds of seed for a lawn, at a rate one of four university extension services publishes.
Confirm the quantity with your local garden center or your state extension service before you buy.
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Topsoil Calculator — Raised Beds and Fill
Topsoil, compost or soilless mix for a raised bed, a new lawn or a top-up, by the cubic yard or the cubic foot, at the depths and mixes extension services publish.
Confirm the quantity with your soil supplier before you buy.
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Paver Base Calculator — Base and Bedding Depth by Area
The stone base and bedding course under a patio, walkway or driveway, with the published minimum depth for what it carries.
Confirm the quantity with your paver or hardscape supplier before you buy.
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Retaining Wall Block Calculator — Courses and Block Count
Blocks, caps and stone for one garden wall.
Confirm the quantity with your hardscape supplier — or a structural engineer for a wall over four feet (1.2 m) (measured from the bottom of the leveling pad to the top of the cap, or of the last course where there is no cap, not from the ground) before you buy.
Structural & exterior
Framing, surfaces and boundaries — the parts a building official may inspect.
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Driveway Asphalt Calculator — Tons by Area and Depth
Tons of hot-mix asphalt for a driveway or parking area at a chosen compacted depth, plus the crushed stone base under it.
Confirm the quantity with your asphalt or aggregate supplier before you buy.
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Roof Pitch and Rafter Length Calculator
Rafter length for a two-slope gable roof from its width and pitch, ridge deducted once, and the boards to buy, worked out against the lengths your own yard stocks.
Confirm the quantity with a licensed contractor or your local building official before you buy.
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Fence Calculator — Posts, Rails and Post-Hole Mix
Posts, rails, boards and post-hole mix.
Confirm the quantity with your fence supplier, and your local building official for any permit or setback rule before you buy.
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Slate Roof Calculator — Slates by Size and Headlap
Slates a roof takes, from the published schedule for size and lap, breakage included.
Confirm the quantity with your roofing supplier or contractor before you buy.
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Tile and Grout Calculator — Cartons of Tile and Bags of Grout
Tile cartons and grout bags, from the grout maker’s own chart for your tile and joint.
Confirm the quantity with your tile supplier before you buy.
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Brick Calculator — Bricks and Mortar per Wall
Brick and bags of mortar mix for one wall. Two publishers count brick differently, and the page asks whose count to use.
Confirm the quantity with your masonry supplier before you buy.
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HVAC BTU Calculator — Rough Room Cooling Capacity
A rough cooling capacity for one room from the published ENERGY STAR sizing chart, with the adjustments printed alongside it. A starting figure to take to a contractor, not a load calculation.
Confirm the quantity with an HVAC contractor performing a Manual J load calculation before you buy.
Calculators still being built are not listed and are not linked. When one is finished it appears here and on the home page at the same time.