40 calculators
Home calculators
Project calculators for around the house — concrete and gravel by volume, with bag and tonnage estimates.
Popular Home calculators
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Square Footage Calculator – Sq Ft for Any Room
Compute square feet, square yards, square meters, and acres with this free square feet calculator. Enter length and width in feet or inches for quick area conversion.
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Concrete Calculator
Estimate the cubic yards, cubic feet, and number of bags of concrete you need for slabs.
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Gravel Calculator
Estimate cubic yards and tons of gravel needed to cover an area at any depth.
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Paint Calculator
Estimate the gallons of paint needed for a room or wall. Subtracts doors and windows, applies coats, and rounds up to a whole gallon order.
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Mulch Calculator
Estimate cubic yards and the number of 2 cu ft and 3 cu ft bags of mulch needed to cover an area.
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Roofing Calculator
Estimate roof area, squares, shingle bundles, and material cost from house length, width, and pitch. Supports a waste allowance and price per bundle. Simple gable assumption; complex roofs need professional measurement.
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Stair Calculator
Plan stair risers and treads from total rise and preferred riser height. Returns the riser count, actual riser height, total run, and an estimated stair angle.
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Tile Calculator
Estimate the number of tiles needed for a floor, wall, backsplash, or shower from area dimensions, tile size, and a waste allowance.
Time & Age
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Acreage Calculator
Calculate the acreage of a plot of land from length and width dimensions or directly from square feet, yards, or meters.
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Age Difference Calculator
Find the exact age gap between two people in years, months, and days. Works for couples, siblings, parents-children, or any two people.
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Age Calculator
Calculate your exact age in years, months, and days, plus your zodiac sign and next birthday countdown.
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Square Footage Calculator – Sq Ft for Any Room
Compute square feet, square yards, square meters, and acres with this free square feet calculator. Enter length and width in feet or inches for quick area conversion.
Construction & Flooring
13 calculatorsHome
Stair Stringer Calculator
Calculate stair stringer length, number of steps, rise and run per step, and slope angle from total rise and run.
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Board and Batten Calculator
Calculate the number of boards and battens needed to cover a wall or build an accent wall, with precise spacing layouts.
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Rafter Calculator
Calculate rafter length, roof rise, and pitch angles for residential roof framing structures.
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Stair Calculator
Plan stair risers and treads from total rise and preferred riser height. Returns the riser count, actual riser height, total run, and an estimated stair angle.
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Board Foot Calculator
Calculate board feet for lumber from thickness, width, length, and quantity, with an optional cost estimate from a price per board foot.
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Tile Calculator
Estimate the number of tiles needed for a floor, wall, backsplash, or shower from area dimensions, tile size, and a waste allowance.
Home
Flooring Calculator
Estimate the number of flooring boxes for a room from length, width, box coverage, and a waste allowance. Works for laminate, vinyl plank, hardwood, and similar.
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Drywall Calculator
Estimate the drywall sheets needed for a room from wall dimensions, sheet size, door and window deductions, and a waste allowance.
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Fence Calculator
Estimate fence posts, sections, panels or pickets, rails, gate openings, and optional concrete bags from fence length, post spacing, and fence type.
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Deck Board Calculator
Estimate the deck boards needed from deck size, board width, board gap, board length, and a waste allowance, with an optional cost estimate.
Home
Roofing Calculator
Estimate roof area, squares, shingle bundles, and material cost from house length, width, and pitch. Supports a waste allowance and price per bundle. Simple gable assumption; complex roofs need professional measurement.
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Conduit Fill Calculator
Estimate conduit fill percentage from conduit interior area, per-wire area, and wire count. Shows total wire area, fill percent, and the reference 1-2-3+ conductor fill limits. Educational tool; not NEC certified.
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Roof Pitch Calculator
Calculate roof pitch from rise and run. Returns pitch in the U.S. x/12 convention, angle in degrees, slope percent, and the roof-surface multiplier for converting plan area to actual sloped roof area.
Landscaping & Volume
11 calculatorsHome
Sakrete Concrete Calculator
Calculate the number of Sakrete concrete mix bags (40 lb, 60 lb, or 80 lb) needed for your slab or footing volume.
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Concrete Calculator
Estimate the cubic yards, cubic feet, and number of bags of concrete you need for slabs.
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Gravel Calculator
Estimate cubic yards and tons of gravel needed to cover an area at any depth.
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Cubic Feet Calculator
Calculate volume in cubic feet from any length, width, and height — supports feet, inches, yards, centimeters, and meters.
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Cubic Yard Calculator
Find the cubic yards you need for concrete, gravel, mulch, or soil from length, width, and depth — with weight estimates.
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Mulch Calculator
Estimate cubic yards and the number of 2 cu ft and 3 cu ft bags of mulch needed to cover an area.
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Pool Volume Calculator
Calculate pool volume in gallons and liters for rectangular, round, oval, or variable-depth pools. Uses average depth for shallow + deep end pools. Educational estimate, not an engineering or fill-up calculation.
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Grass Seed Calculator
Estimate pounds of grass seed needed for a lawn from area and seed rate per 1,000 sq ft, with new-lawn and overseeding presets. Returns pounds, bag count, and an optional cost estimate.
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Sand Calculator
Calculate sand volume in cubic feet and cubic yards, weight in tons, bag count, and estimated cost. Uses sand density presets (dry, wet, masonry) so the tonnage and bag count reflect the material.
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Topsoil Calculator
Calculate topsoil cubic yards, bags, and cost for lawn topdressing, garden beds, raised beds, or custom depth jobs. Compares bag delivery against bulk yardage so you can pick the cheaper option.
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Asphalt Calculator
Estimate asphalt volume and tons for driveways and small parking areas from length, width, and pavement thickness. Uses common hot-mix density (about 145 lb/ft^3) and supports a waste allowance and cost per ton.
Decorating & Maintenance
6 calculatorsHome
Circle Skirt Calculator
Calculate waist radius cut measurements and the total fabric yardage needed for full, half, or quarter circle skirts.
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Cross Stitch Calculator
Calculate the required fabric dimensions for cross-stitch projects based on stitch count, Aida fabric count, and border margins.
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Compression Ratio Calculator
Calculate engine compression ratio (CR) from cylinder bore, piston stroke, chamber volume, piston dish/dome, deck clearance, and gasket thickness.
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Paint Calculator
Estimate the gallons of paint needed for a room or wall. Subtracts doors and windows, applies coats, and rounds up to a whole gallon order.
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Wallpaper Calculator
Calculate the number of wallpaper rolls needed from wall length, height, count, and door/window deductions. Adjusts for pattern-repeat waste and a general waste allowance, with optional cost estimate.
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BTU Calculator
Estimate room heating or cooling BTU per hour from room size, ceiling height, insulation, sun exposure, and occupants. Rough planning estimate, not a Manual J load calculation.
Other
6 calculatorsHome
Air Fryer Conversion Calculator
Convert standard oven recipes to air fryer time and temperature settings automatically.
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Recessed Lighting Calculator
Estimate the number of recessed light fixtures needed for a room, plan their grid layout spacing, and verify lumen adequacy.
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ABV Calculator
Calculate alcohol by volume (ABV) from original and final gravity readings. Includes apparent attenuation, ABW, and estimated calories.
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Board Feet Calculator
Calculate the total board feet of lumber from thickness, width, length, and quantity, with an optional cost estimate.
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Heat Index Calculator
Calculate the heat index (apparent temperature) from air temperature and relative humidity using the NOAA Rothfusz regression.
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Tire Size Calculator
Calculate tire sidewall height, overall diameter, circumference, and revolutions per mile from tire size parameters.