Structural Calculators
Structural calculations ensure that buildings can safely support their intended loads. Whether you're framing a floor, building a deck, or determining footing sizes, proper structural sizing prevents sagging, cracking, and catastrophic failure. These calculators apply engineering principles to common residential and light commercial scenarios.
Beams and joists must span distances while supporting dead loads (the weight of the structure itself) and live loads (people, furniture, snow). The appropriate size depends on span length, load requirements, lumber species, and spacing. These calculators reference span tables from building codes and engineering standards.
Foundation elements like footings and columns transfer building loads to the ground. Undersized footings settle or crack; undersized columns buckle. These calculators help determine appropriate dimensions based on the loads being supported and soil bearing capacity.
All Structural Calculators
Beam Size Calculator
Determine appropriate beam dimensions based on span length, tributary load width, and load type. Calculates required beam depth for solid lumber, LVL, and engineered lumber options.
Joist Span Calculator
Calculate maximum allowable spans for floor and ceiling joists based on lumber size, species, grade, spacing, and load requirements. References IRC span tables.
Rafter Calculator
Determine rafter lengths, bird's mouth cuts, and ridge heights based on roof span, pitch, and overhang. Provides cutting dimensions for stick-framed roofs.
Stair Calculator
Calculate rise, run, and stringer dimensions for code-compliant stairs. Factors in total height, available space, and local building code requirements.
Footing Size Calculator
Determine concrete footing dimensions based on column loads and soil bearing capacity. Essential for deck posts, porches, and foundation piers.
Column Load Calculator
Calculate the load capacity of wood and steel columns based on height, cross-section, and material properties. Helps verify columns can support intended loads.
Deck Load Calculator
Determine deck weight capacity based on joist size, beam size, post spacing, and footing size. Ensures decks can safely support people and furniture.
Header Size Calculator
Calculate header beam sizes for window and door openings in load-bearing walls. Factors in opening width, floors supported, and roof loads above.
Retaining Wall Calculator
Estimate retaining wall block quantities and determine if engineering is required based on wall height. Includes drainage and setback considerations.
Truss Calculator
Calculate basic roof truss dimensions and angles based on span and pitch. Provides member lengths and cutting angles for simple king post and queen post designs.
Which Calculator Should You Use?
Framing a floor? Start with the Joist Span Calculator to size joists, then use the Beam Size Calculator for any supporting beams.
Building a deck? The Deck Load Calculator verifies your design. Use Footing Size and Column Load Calculators for post foundations.
Framing a roof? The Rafter Calculator provides cutting dimensions for stick framing. The Truss Calculator helps with truss geometry.
Adding windows or doors? The Header Size Calculator determines the beam needed to span openings in load-bearing walls.