Construction & Material Calculators
Calculate stairs, roof and rafter geometry, spacing layouts and material quantities. Diagrams identify the measurement convention used; regulated and structural work still needs current local verification.
Fence post spacing calculator
Calculate equal fence bays, post counts, centre positions and clear gaps for an open run or closed loop.
Board and batten spacing calculator
Lay out edge-flush battens with equal clear gaps, coordinates, quantities and waste.
Wall framing layout and quantity calculator
Create stud coordinates and cut lists with plates, one door/window opening, explicit header assumptions and waste.
Deck layout planner
Edit a 2D deck plan with board direction, L-shaped cutout, support positions, stock cuts, costs and PDF/SVG/CSV exports.
Framing cost calculator
Price purchased studs, plates, headers, connectors and crew labor with explicit markup and tax assumptions.
Drywall installation cost calculator
Calculate whole panels, opening deductions, layers, waste and user-priced installation costs.
Construction material dimensions guide
Compare actual and coordinating brick/block sizes, lumber and crown dimensions with manufacturer references.
Stair landing layout calculator
Plan two flights with uniform risers, landing elevation, straight/L/U footprint and downloadable diagrams.
Spiral stair dimension planner
Calculate spiral diameter, riser height, angular pitch, walking-line arc/chord and tread elevation table.
Pipe seal catalog selector
Find exact PSI 2023.1 seal models, element counts and article numbers for measured hole and pipe diameters.
Deck load demand worksheet
Calculate uniform deck load demand and whole support-line reactions for one simple span, using entered loads.
DCA6 Southern Pine span reference
Look up the limited Southern Pine No. 2 span subset from AWC DCA6-2015 Tables 2 and 3A with explicit scope checks.
Footing bearing-area arithmetic
Calculate bearing-only area from centred service compression and verified allowable soil pressure; no footing thickness design.
Shear stress reference calculation
Calculate average direct shear, rectangular-beam maximum shear or local VQ/It stress with an explicit section model.
Thin-wall cylinder membrane stress
Estimate thin-wall cylinder hoop and closed-end axial membrane stresses for static internal pressure with D/t greater than 20.
Single-slope roof layout and materials
Calculate single-slope roof area, entered-spacing rafter centres and effective-covering piece quantities.
Baluster Spacing Calculator
Enter the railing opening, baluster width and maximum gap you intend to use to calculate an equal-spacing layout.
Fence Picket Spacing
Lay out fence picket spacing across a run, with a live diagram of the finished fence section.
Stair Calculator
Work out riser and tread count, riser height and stair angle from total rise and run.
Roof Pitch Calculator
Visualize roof pitch as rise/run, degrees and a scaled triangle diagram.
Tile Layout Calculator
Plan a tile grid across a room, centered or edge-started, with grout gaps and edge-cut sizes.
Concrete Volume Calculator
Calculate concrete volume for a slab, footing, column or cylinder, with a labeled diagram.
Gravel Calculator
Calculate how much gravel, mulch or soil you need for an area and depth.
Paint Calculator
Calculate how much paint you need for walls, accounting for doors, windows and coats.
Brick Calculator
Estimate the number of bricks or blocks needed for a wall, including mortar joints.
Hip Rafter Calculator
Calculate hip rafter length and angle plus a full jack-rafter length table for a hip corner.
Advanced Hip/Valley/Jack
Calculate hip, valley and jack rafter seat cuts and compound cheek (side) cuts, beyond length and plumb angle alone.
Compound Crown Molding
Calculate the flat-cut compound miter and bevel saw settings for crown molding from spring angle and wall corner angle.
Birdsmouth Calculator
Turn roof pitch and plate width into birdsmouth seat, notch depth and height-above-plate dimensions.
Winder Stair Layout
Lay out a balanced quarter-turn winder stair with tread geometry, walk-line goings and a scaled plan diagram.
Irregular Hip Roof
Calculate the shifted plan angle, true hip length, face-specific backing bevels and jack differences for unequal roof pitches.
Unequal-Pitch Valley
Calculate internal valley centerline geometry, separate backing bevels and side-specific jack differences for two unequal roof pitches.
Polygon Roof Calculator
Calculate common and hip centerline rafters, rise, plan angles and roof-face area for regular 3–16-sided roofs.
Shed Dormer Framing
Intersect a shed-dormer roof with the main roof to find tie-in location, rafter length and theoretical cheek-valley line.