For the complete documentation index, see llms.txt.
19 endpoints

Construction API

Same bearer token, same credit pool, same JSON envelope as every other endpoint — drop them into apps, sites, workflows, or agents without rebuilding formulas, validation, or docs.

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Construction And DIY Calculators
Lumber Calculatorlumber-calculator
Calculate board feet, coverage, waste, linear feet, and lumber cost.
1cr · v2026-04-22
Layout
Miter Angle Calculatormiter-angle-calculator
Miter and bevel saw angles for flat trim or compound crown-molding cuts, given the corner angle.
1cr · v2026-04-22
Squareness Checkersquareness-checker
Check a corner against the Pythagorean 3-4-5 squareness rule.
1cr · v2026-04-22
Stair Calculatorstair-calculator
Estimate stair risers, treads, run, stringer length, slope, and step profile data.
1cr · v2026-04-22
Lumber
Board Foot Calculatorboard-foot-calculator
Calculate lumber volume in board feet, cubic volume, weight, and optional cost.
1cr · v2026-04-22
Materials
Asphalt Calculatorasphalt-calculator
Estimate asphalt volume, tonnage, waste buffer, truckloads, and material cost.
1cr · v2026-04-22
Brick and Mortar Calculatorbrick-and-mortar-calculator
Brick count and mortar volume/bag estimate for a wall, by brick type, bond thickness, and waste allowance.
1cr · v2026-04-22
Carpet Calculatorcarpet-calculator
Estimate carpet area, waste, roll length, padding, installation, and cost.
1cr · v2026-04-22
Concrete Calculatorconcrete-calculator
Concrete volume in cubic feet/yards/meters plus pre-mix bag counts for slabs, footings, round columns, and staircases.
1cr · v2026-04-22
Decking Calculatordecking-calculator
Estimate decking boards, joists, beams, posts, fasteners, and waste.
1cr · v2026-04-22
Drywall Calculatordrywall-calculator
Drywall sheets, joint compound, tape, and screws needed for walls and ceilings with a waste allowance.
1cr · v2026-04-22
Fence Calculatorfence-calculator
Fence posts, rails, pickets or panels, concrete, and gate hardware for privacy, picket, post-and-rail, or panel fence styles.
1cr · v2026-04-22
Paint Calculatorpaint-calculator
Paint quantity for walls, ceiling, and trim with door/window deductions, texture adjustment, and multi-coat coverage.
1cr · v2026-04-22
Steel Weight Calculatorsteel-weight-calculator
Weight of steel and other metal bars, plates, pipes, tubes, and angles from shape dimensions, density, and quantity.
1cr · v2026-04-22
Tile Calculatortile-calculator
Estimate tile count, boxes, grout, adhesive, sealer, waste, and optional cost.
1cr · v2026-04-22
Wallpaper Calculatorwallpaper-calculator
Estimate wallpaper drops, rolls, waste, coverage, and optional cost.
1cr · v2026-04-22
Roofing
Roof Pitch Calculatorroof-pitch-calculator
Calculate roof pitch, angle, slope percent, and rafter multiplier.
1cr · v2026-04-22
Structural
Beam Load Calculatorbeam-load-calculator
Beam bending moment, shear, stress, and deflection for common support/load cases with strength and serviceability checks.
1cr · v2026-04-22
Rebar Calculatorrebar-calculator
Rebar bar count, total linear footage, and weight for a concrete slab grid, sizes #3-#10 with cover and waste allowance.
1cr · v2026-04-22