Framing & Structural Calculators
Framing numbers decide whether a floor feels solid and a stair passes inspection. These calculators size floor joists and header beams, space trusses, lay out stair stringers, set knee wall stud heights, and work out rough openings for windows, doors and pocket doors. They also count lag bolts for a deck ledger, total board feet, and turn a list of parts into a plywood cut plan. Each one states its assumptions. Treat the results as planning estimates, because your local building department has the final word on structural sizes.
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All Framing & Structure Calculators
Deck Ledger Board Lag Bolt Calculator
Calculate exact lag bolt spacing for deck ledger boards. Enter deck dimensions and get IRC-compliant bolt patterns, quantities, and placement tables instantly.
Floor Joist Span & Size Calculator
Calculate floor joist span, size, and spacing for any room. Free floor joist span calculator with lumber grade, load, and deflection tables. Get results instantly.
Header Beam Size Calculator
Calculate the correct header beam size for doors, windows, and openings. Get recommended beam dimensions based on span, load, and lumber species instantly.
Knee Wall Stud Height & Attic Storage Calculator
Calculate knee wall stud height and usable attic storage area based on roof pitch, rafter span, and desired clearance. Free knee wall height calculator.
Lumber & Board Foot Calculator
Free board foot calculator for lumber. Enter thickness, width, and length to instantly calculate board feet, linear feet, and estimated cost for any wood project.
Plywood & Sheet Goods Cut Optimizer
Optimize your plywood cuts to minimize waste. Enter sheet size and required pieces to get the most efficient cutting layout. Free plywood cut calculator sheet optimizer.
Pocket Door Rough Opening & Cavity Calculator
Calculate the exact rough opening and wall cavity dimensions for any pocket door. Enter door size, wall type, and hardware specs for instant results.
Stair Stringer Calculator
Calculate stair stringer length, rise, run, angle, and cut dimensions instantly. Free stair calculator for deck, basement, and interior stairs.
Truss Span & Spacing Calculator
Calculate roof truss span, spacing, count, and load estimates instantly. Free online roof truss calculator for builders, contractors, and DIYers.
Window & Door Rough Opening Calculator
Calculate exact rough opening sizes for windows and doors instantly. Get framing dimensions, header sizes, and trimmer stud counts for any window or door project.