TAPELINECALC
Construction calculators that show their work. Feet, inches and sixteenths — kept exact, never rounded behind your back, and every constant cites the document it came from.
Every calculator
Square footage calculatorSquare feet from your lengths, with the openings taken out.Gravel calculatorCubic yards and tons from length × width × depth.Cubic yard calculatorAny length, width and depth converted to cubic yards.Mulch calculatorBags or bulk yards for the depth you actually spread.Asphalt calculatorHot-mix tonnage for a driveway or lot at your thickness.Board foot calculatorBoard feet for rough lumber, by the piece or the order.Stair calculatorRiser, tread and stringer from one total rise — checked against code.Roof pitch calculatorPitch, angle and rafter length from any two knowns.Drywall calculatorSheets, screws and mud for walls and ceilings.Topsoil calculatorYards of dirt to order, and what the ticket will weigh.Concrete calculatorBags or truck yards for a slab, footing or post holes.Feet & inches calculatorAdd, subtract, multiply feet-inch-fraction measurements exactly.Inches to decimal calculatorAny tape fraction as decimal inches, feet and millimetres.
Why the numbers are different here
Most construction calculators round to a decimal somewhere in the middle and hand you the result of that rounding. This one keeps every measurement as an exact fraction from the first keystroke to the last, and rounds only when it draws the answer on screen — and says so when it does.
Every constant on this site — bag yields, material densities, code limits — carries the published document it came from, printed on the page beside the number. If a figure has no source we do not use it.
The same arithmetic runs in the phone app, because both install the same versioned package and both run its test vectors before shipping. The website and the app cannot disagree.