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Free construction calculators that show the working.
Roof pitch, stairs, square footage, and feet and inches — each tool solves one problem in full, in the browser, with exact fractions and the formula written out. No signup, no blurred results, nothing held back.
Free online construction calculators
Each one answers its question in full, in the browser. Nothing is blurred, nothing is held back. Use them as they are, or download the app for the deeper tools: stringer layout, code reports, rafter cuts, and material takeoffs.
/CALCULATORS/ROOF-PITCH/
Roof pitch calculator
Convert any roof pitch to degrees, percent grade, slope ratio, and rafter factor. Includes the full 1/12 to 24/12 pitch chart.
/CALCULATORS/STAIRS/
Stair calculator
Riser height, tread depth, number of steps, total run, stair angle, and stringer length. Checks limits against IRC 2021.
/CALCULATORS/SQUARE-FOOTAGE/
Square footage calculator
Rooms, walls, concrete slabs, and irregular shapes. Enter feet and inches, get sq ft, sq yd, and sq m. Running total included.
/CALCULATORS/FEET-INCHES/
Feet and inches calculator
Add, subtract, multiply, and divide measurements in fractions. Exact to a sixty-fourth, with the working shown.
Three things these calculators do differently
Exact fractions, not decimals
Fractions are carried at full precision and rounded once, on the way to the screen. A riser of 7-3/16 in is 7-3/16 in from the input to the cut, not 7.1875 rounded twice.
Shows the working
Every result opens into the named formula with your own numbers substituted into it. You can check the arithmetic by eye without trusting the tool.
Every constant sourced
Code limits are printed with their section number and the margin. You always know which book a number came from and how close you are.
Download the Sawline app for the full jobsite tool
The website answers one question at a time. The app carries the whole job: rafter cuts and birdsmouth layouts, stair stringers with code reports, material takeoffs with waste, and saved projects that work with no signal.
Roof framing and rafter cuts
Pitch to degrees, grade, ratio and the rafter factor — then the plumb, seat, and cheek cuts with HAP and ridge deduction.
Stair layout and code check
One rise in, the whole flight out. The app marks the stringer, checks each value against the ruleset, and prints the section number.
Code report with section numbers
Every row names the value, the limit, and the section it came from — including rows that pass. No guessing where a number came from.
Material takeoffs with waste
Waste is always its own line, never folded into the total. Concrete, block, studs, sheet goods, tile, and paint.
What is in the app
Framing, stairs, materials, cut angles, and four trade packs — one app, one purchase, no subscription.
Framing & roofing
Rafters, hips, jacks
Commons, hips, valleys and jack schedules, all built from the full-precision common. Plumb, seat and cheek cuts, HAP and the ridge deduction.
Stairs
Solved, then checked
Run-limited or riser-limited, with "it does not fit" treated as a real answer. Stringer, angle, throat, and the layout marks.
Materials
Takeoffs with visible waste
Concrete, block, studs, sheet goods, rebar, roofing, siding, tile and paint. Waste is always its own line, never folded into the total.
Cut angles
Compound miter and bevel
Crown at any spring and wall angle, nested or flat, plus polygons, hoppers and baluster spacing. Every setting names its board orientation.
The trades, included
Electrical, plumbing, HVAC, machinist
Voltage drop and box fill, pipe and rolling offsets, duct sizing, bolt circles, speeds and feeds. All four sets are built in, with nothing to buy again.
Built for the jobsite
Works with no signal
Everything runs on the device. Screen stays awake, keys sized for gloves, outdoor theme for bright sun, and the tape exports as CSV or PDF.