Construction calculators
Site and finish takeoffs from the numbers you type. Every page here is an estimate. None of them is structural design, a permit, or code approval.
43 tools
In this group
Bulk volume: concrete, excavation, gravel, mulch, cubic yards, cubic inches, and post hole. Area: square footage, land area, square inches, and linear feet. Finish counts: paint, tile, brick, drywall, siding, board and batten, insulation, and studs. Lumber and metal: board feet, metal weight, and rebar. Site geometry: fencing, pool volume, scale drawing, stairs, roof pitch, roof area, roof snow load, shingles, metal roofing, tank volume, and grade. Outdoor hardscape and yard: deck flooring, baluster, retaining wall, concrete block, pavers, asphalt, asphalt sealer, grass seed, and lawn mowing.
Estimates, not structural design
Waste, bags, and gallons help you plan a purchase. They do not size beams, mix psi, stair code, or a legal lot. Confirm with a supplier, a builder, or a surveyor where the job binds you. See the disclaimer.
- Land Area Calculator Rectangle arithmetic for lots: square feet, square meters, acres, and hectares. A surveyor is required for a legal area. This is not a GIS map and not a plat.
- Asphalt Sealer Calculator Gallons equal area divided by coverage, times coats. Coats stay from 1 to 5. Porous pavement drinks more product. Estimate only, not a permit, code check, or engineered design.
- Asphalt Calculator Volume is area times thickness in feet. Tons equal volume times density divided by 2000. Default density is 145 lb per cubic foot. Estimate only, not a permit, code check, or engineered design.
- Baluster Calculator Pitch is baluster width plus max clear gap. Spaces ceil from rail length over pitch. Balusters between ends equal spaces minus one. Estimate only, not a permit, code check, or engineered design.
- Board and Batten Calculator Net wall area subtracts openings. Boards ceil across wall length with waste. Battens sketch as boards minus one. Estimate only, not a permit, code check, or engineered design.
- Board Feet Calculator A board foot is a volume unit for lumber: thickness in inches times width in inches times length in feet, divided by 12, times the piece count. Nominal sizes are not dressed sizes. Estimate only, not a mill ticket or grade stamp.
- Brick Calculator Net wall area is length times height minus openings. Divide by brick length times brick height. Waste percent rounds the buy count up. Use the same unit for the wall and the brick face. Estimate only, not a bond schedule.
- Concrete Block Calculator Net wall area subtracts openings. Divide by block face, apply waste from 0 to 40 percent, and round up. A common CMU face is 16 by 8 in, or about 1.333 by 0.667 ft. Estimate only, not a permit, code check, or engineered design.
- Concrete Calculator Slab volume is length times width times depth. A cylinder is π r² h. Cubic yards divide cubic feet by 27. Waste is 0 to 50 percent. This is an estimate, not structural design or code approval.
- Cubic Inches Calculator Cubic inches equal length times width times height when every side is inches. The page also shows cubic feet, cubic centimeters, and liters. Estimate only, not a permit, code check, or engineered design.
- Cubic Yards Calculator Box mode multiplies length, width, and depth in one unit, then reports yd³, ft³, and m³. Convert mode scales a typed volume among yd³, ft³, m³, and in³. Estimate only, not a permit, code check, or engineered design.
- Deck Flooring Calculator Deck area is length times width. Divide by board width times board length, apply waste from 0 to 40 percent, and round up. Gaps and picture-frame borders are omitted. Estimate only, not a permit, code check, or engineered design.
- Drywall Calculator Wall area is length times height times the number of walls. Divide by sheet length times sheet width, then apply waste and round up. Openings are omitted. Estimate only, not a hanging plan or code approval.
- Excavation Calculator Box volume for a trench or pad: length times width times depth, then multiplied by 1 plus waste or swell percent. Output is ft³, yd³, and m³. Optional tons if you type density. Estimate only, not a cut-and-fill design.
- Fence Calculator A straight run divides into spans of the post spacing you type. Posts are spans plus one, then plus extra corners. Rail pieces are spans times rails per span. Estimate only. Gates, slope, and code are not included.
- Grade Calculator Site grade is rise divided by run. You get percent grade, a 1:x ratio, and an angle. This is not a survey plat. Math slope between two points and roof pitch live on other URLs.
- Grass Seed Calculator Seed pounds scale from area and a typed rate. Choose pounds per 1000 square feet or pounds per acre. Soil prep and overseed rates stay on you. Estimate only, not a permit, code check, or engineered design.
- Gravel Calculator Box volume for crushed stone or gravel. Cubic yards divide cubic feet by 27. Optional tons use a density in lb/ft³ you type. This is coverage, not a concrete mix design.
- Insulation Calculator Divide wall or attic area by batt coverage from the label, apply waste from 0 to 40 percent, and round up. R-value and compression stay on you. Estimate only, not a permit, code check, or engineered design.
- Lawn Mowing Calculator Effective cutting width shrinks by overlap percent. Path length is area divided by that width. Time is path length over speed. Estimate only, not a permit, code check, or engineered design.
- Linear Feet Calculator Perimeter mode uses 2 × (length + width). Sum mode adds up to four lengths. Same unit across fields. Estimate only, not a permit, code check, or engineered design.
- Metal Roofing Calculator Panels across ceil from roof length over coverage width. Panels up slope ceil from width over panel length. Waste multiplies the grid. Estimate only, not a permit, code check, or engineered design.
- Metal Weight Calculator Pick a material, a shape, and a length unit. Plate uses length, width, and thickness. Round bar uses length and diameter. Pipe uses length, outside diameter, and wall. Mass is volume times a typical density. Alloys differ. Not a mill cert.
- Mulch Calculator Bed volume for landscaping mulch. Depth is often 2 to 3 inches. Cubic yards divide cubic feet by 27. This is coverage, not a soil test.
- Paint Calculator Wall area is 2 × (length + width) × height. Doors subtract 20 ft² each. Windows subtract 15 ft² each. Gallons are net area times coats divided by coverage, then rounded up to buy. Estimate only.
- Paver Calculator Paved area is length times width. Divide by paver length times paver width, apply waste from 0 to 40 percent, and round up. Borders and patterns change counts. Estimate only, not a permit, code check, or engineered design.
- Pool Volume Calculator A rectangle is length times width times a single depth. A circle is π r² times that depth. Output is cubic meters, liters, and US gallons. Freeform hoppers and spa benches are omitted. Estimate only, not a fill ticket.
- Post Hole Calculator Each hole is π r² h. Multiply by hole count and waste factor. Optional bag yield returns bag count. Default diameter unit is inches and depth unit is feet. Estimate only, not a permit, code check, or engineered design.
- Rebar Calculator Slab length and width are feet. Spacing and edge clearance are inches. Bars form a single mat. Weight uses lb per foot (default 0.668 for #4 class). Estimate only, not a permit, code check, or engineered design.
- Refrigerant Line Charge Calculator Estimate liquid refrigerant mass in a line from length, tube inner diameter, and liquid density. Default 25 ft of 3/8 in OD R-410A tube. Not a charging protocol or EPA procedure.
- Retaining Wall Calculator Wall face area is length times height. Divide by block face, apply waste from 0 to 40 percent, and round up. Optional depth sketches volume. Estimate only, not a permit, code check, or engineered design.
- Roof Area Calculator Plan length times width, then multiply by hypot(run, rise) divided by run. That is a simple gable from a rectangular plan. Estimate only, not a full takeoff.
- Roof Pitch Calculator Pitch is rise over run, shown as x:12, degrees, and percent. The area factor is hypot(1, rise/run). Multiply a plan area by that factor. Estimate only, not code approval.
- Roof Snow Load Calculator Flat-roof sketch pf equals 0.7 times Ce times Ct times I times ground snow pg. Optional roof area multiplies pf into total pounds. Estimate only, not a permit, code check, or engineered design.
- Scale Drawing Calculator Type a length measured on the drawing, a scale like 1:50, the drawing unit, and the real unit. Real length in drawing units is drawn × (right / left). The page also converts into the real unit you pick. Not a survey plat.
- Shingle Calculator Squares with waste equal (area / 100) times (1 + waste/100). Bundles ceil from squares times bundles per square. Default is 3 bundles per square. Estimate only, not a permit, code check, or engineered design.
- Siding Calculator Net wall area subtracts openings. Squares with waste equal (area / 100) times (1 + waste/100). Optional exposure and piece length sketch courses and pieces. Estimate only, not a permit, code check, or engineered design.
- Square Footage Calculator Floor area from rectangles you type. One room uses length and width. Several rooms go in the list, one pair per line. Output is ft², m², acres, and hectares. Estimate only. This is not a survey or code approval.
- Square Inches Calculator Square inches equal length times width when both sides are inches. The page also shows square feet, square centimeters, and square meters. Estimate only, not a permit, code check, or engineered design.
- Stair Calculator Risers are ceil(total rise / max riser), at least 2. Treads equal risers minus 1. Optional total run yields tread depth and 2R+T. This is not building-code approval.
- Stud Calculator Spaces ceil from wall length over on-center spacing. Studs equal spaces plus one, plus extras for corners or openings. Default length unit is feet and spacing unit is inches. Estimate only, not a permit, code check, or engineered design.
- Tank Volume Calculator Vertical cylinder, horizontal cylinder with a circular segment fill, or a rectangular box. Output is m³, liters, and US gallons. The manufacturer stamp wins. This is not a pool-volume calculator.
- Tile Calculator Room area divided by one tile, then waste up to 40 percent, then a whole-tile buy count. Pattern layout can raise waste. Estimate only.