Code Calculators
Instant answers for sizing, load calculations, and code compliance. Every result references the applicable building code section.
Building Permit Fee Calculator
Estimate permit, plan review and add-on fees from a city’s own published fee schedule. Covers every jurisdiction with a fee schedule on file, with the source document linked.
Occupant Load & Egress Calculator
Occupant load per IBC Table 1004.5 across multiple spaces, then required egress width and exit count per IBC 1005.3 and Table 1006.2.1.
Stair Layout Calculator
Calculate riser height, tread depth, total run, and stringer length with IBC/IRC code compliance checks.
Beam Span Calculator
Estimate maximum allowable joist spans by lumber species, grade, size, and spacing. Provisional — span values are pending verification against the printed IRC tables.
Concrete Volume Calculator
Calculate cubic yards of concrete for slabs, circular columns, and wall footings with waste factor and bag count.
Excavation Calculator
Calculate cut volume in bank and loose cubic yards with soil swell and shrink factors, sloped sides, and haul truck load counts.
Deck Footing Calculator
Calculate required footing diameter and bearing area for deck posts based on tributary area, loads, and soil conditions.
Electrical Load Calculator
Calculate total electrical demand for a dwelling unit using the NEC Optional Method, including appliance loads and demand factors.
Wire Size Calculator
Determine the minimum wire size based on amperage, conductor material, and temperature rating per NEC ampacity tables.
HVAC Load Estimator
Screening-level heating and cooling estimate by climate zone, insulation, and building size. Not a Manual J calculation — use it to sanity-check equipment sizing.
Fire Resistance Calculator
Calculate the fire-resistance rating of wood-frame walls and floors with the IBC Component Additive Method: membrane + framing + insulation.
Need a custom calculation?
Ask Code AI to perform any building code calculation with full code references.