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.
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.