All calculators
Each tool uses the same typed engine and a Metric/Imperial toggle. English defaults to board feet and inches; German, Polish, Spanish and French default to millimetres and cubic metres.
Carpentry & framing
Board feet, stairs, rafters, wall studs and deck spans for structural carpentry.
Carpentry & framing
Lumber Board Foot & Cost Calculator
Convert actual lumber thickness, width, length and quantity into board feet or cubic metres, add waste, and estimate material cost in imperial or metric units.
Carpentry & framing
Deck Joist & Beam Span Calculator
Estimate maximum joist span, joist count and whether a mid-span beam is needed from species, 2x size and spacing. Educational spans, not a code table.
Carpentry & framing
Roof Pitch & Rafter Length Calculator
Calculate common rafter length, pitch angle, rise and overhang from building span and a rise-per-12 pitch.
Carpentry & framing
Stair Rise and Run Calculator
Size stair risers, treads and stringer length from total rise and a target step height. Works in inches or millimetres.
Carpentry & framing
Wall Framing Stud Estimator
Estimate studs, extra jack/king pairs for openings, and triple-plate lumber for a wall of given length and on-center spacing.
Fine woodworking & cabinetry
Crown moulding, shelf sag, cabinet doors, balusters, wood movement and segmented rings.
Fine woodworking & cabinetry
Baluster / Spindle Spacing Calculator
Evenly space balusters or pickets between posts so the gap stays at or under the 4-inch (102 mm) sphere rule.
Fine woodworking & cabinetry
Cabinet Door Sizing Calculator
Size overlay or inset cabinet doors and rail/stile cut lengths from the opening, overlay or gap, and stile width.
Fine woodworking & cabinetry
Crown Molding Angle Calculator
Get compound-saw miter and bevel angles from crown spring angle and wall corner. Defaults match 52° spring on a 90° inside corner.
Fine woodworking & cabinetry
Polygon & Segmented Ring Calculator
Miter angle, outside face length and chord for regular polygons and segmented turning rings from side count and diameter.
Fine woodworking & cabinetry
Shelf Sag (Load Bearing) Calculator
Estimate shelf deflection from span, thickness, depth, material and load, and check a simple L/360 stiffness rule.
Fine woodworking & cabinetry
Wood Movement / Expansion Estimator
Estimate seasonal width change of a board from species, flatsawn vs quartersawn cut, and the change in moisture content.
Masonry & site work
Concrete bags, retaining-wall blocks and gravel, soil or mulch volume.
Masonry & site work
Concrete Volume & Bag Estimator
Convert slab or footing dimensions into cubic yards or cubic metres and 60 lb / 80 lb bag counts, with optional waste.
Masonry & site work
Gravel / Soil / Mulch Volume Calculator
Convert a rectangular bed into cubic yards or cubic metres of gravel, soil or mulch from length, width, depth and waste.
Masonry & site work
Retaining Wall Block Estimator
Estimate face blocks, capstones and gravel backfill for a retaining wall from wall size, block size and backfill depth.
Finishing & materials
Drywall, paint or stain coverage, and flooring or tile with waste.
Finishing & materials
Drywall / Sheetrock Estimator
Estimate 4×8 drywall sheets, joint tape and compound for a room from length, width, height, openings and optional ceiling.
Finishing & materials
Flooring / Tile Calculator
Calculate net floor area, order area with waste, and pack count for laminate, hardwood or tile.
Finishing & materials
Paint / Stain Coverage Calculator
Estimate paint or stain from room size, doors, windows, coats and coverage per gallon or litre.