Builder's Formulator

About this app

Builder's Formulator is the ultimate professional reference tool for general contractors, builders, plumbers, HVAC technicians, and electricians. With over 2,600 formulas, 136 plumbing code charts, 27 technical drawings, and complete ADA accessibility references, it's the most comprehensive construction calculator available. CONSTRUCTION — Calculate joists, studs, headers, hardwood flooring costs, concrete and excavation volumes, bricks needed for a wall, roofing materials, stair dimensions, lumber requirements, and acoustic absorption. Includes material weight references for dozens of building materials. STRUCTURAL ENGINEERING — Comprehensive beam analysis for single-span and cantilevered beams with point loads, uniform loads, and triangular loads. Concrete design for flexure, shear, axial compression, and prestressed concrete. Masonry stress analysis, steel design, wood design, flat plate calculations, soil bearing capacity, and road/highway formulas. ELECTRICAL — Calculate kilowatts, horsepower, efficiency, power factor, watts, amps, resistance, and voltage. Includes transformer calculations, voltage drop analysis, motor sizing, battery calculations, AC/DC circuits, Ohm's Law, impedance, frequency conversions, and UPS sizing. PLUMBING & HVAC — Pipe sizing, flow velocity, friction loss, pressure calculations, drainage and venting, storm drainage, gas piping, water heater sizing and recovery, pump horsepower, septic and sewage systems, grease interceptors, thermal expansion, water supply sizing, medical gas piping, and swimming pool calculations. Boiler efficiency, condensation, and comprehensive water flow analysis. HVAC SYSTEMS — Dedicated ductwork and duct sizing, fan laws, pump laws, gas laws, hydronic formulas, psychrometrics, ventilation rates, heating design, refrigeration, steam systems, air change rate equations, humidity calculations, and heating/cooling load analysis. FINANCIAL — Mortgage calculations, depreciation, investment analysis, interest formulas, debt ratios, and price quotes. REFERENCE LIBRARY — 136 plumbing code charts and tables covering gas piping, drainage, venting, backflow prevention, medical gas, thermal expansion, fixture units, and more. 27 technical drawings for venting systems, chimney terminations, gas clearances, and water heater installations. Complete ADA accessibility reference with 52 diagrams and 17 documents covering wheelchair dimensions, grab bars, ramps, parking, elevators, and restroom clearances. Plus built-in reference tables for occupancy loads, brick sizes, lumber dimensions, wire gauge, concrete mixes, and insulation R-values. CONVERSIONS — Hundreds of unit conversions across pressure, volume, linear measure, area, weight, flow, power, BTU, and eight temperature scales including Celsius, Fahrenheit, Kelvin, and Rankine. FEATURES — Save and revisit calculations, mark favorites for quick access, toggle between US and metric units, export and share results, and view your complete calculation history. Dark mode interface designed for jobsite readability. Builder's Formulator — one app for every trade on the job.

--- What's New in Version 5.0 Completely rebuilt from the ground up. Builder's Formulator has been rewritten with an entirely new codebase, delivering a faster, more modern experience. Massive formula expansion — Now includes over 2,600 formulas, up from 200. Every calculation from our Electrical, Carpentry, and Plumbing Formulators is here, plus hundreds more. New: Structural Engineering — Full beam analysis for single-span and cantilevered beams, concrete design, masonry, steel, wood design, flat plates, soils, and road calculations. New: HVAC Systems — Dedicated section with ductwork sizing, fan laws, pump laws, gas laws, hydronic formulas, psychrometrics, ventilation rates, heating design, refrigeration, and steam system calculations. New: Expanded Plumbing — Pipe sizing and friction loss, drainage and venting, storm drainage, gas piping, septic systems, grease interceptors, thermal expansion, water supply, medical gas piping, and swimming pool calculations. New: ADA Reference Library — 52 accessibility diagrams and 17 reference documents covering wheelchair clearances, grab bars, ramps, parking, elevators, restrooms, and more. New: Technical Drawings — 27 plumbing and mechanical drawings for venting systems, chimney terminations, gas clearances, and water heater installations. New: Plumbing Code Charts — 136 charts and tables covering gas piping, drainage, venting, backflow prevention, medical gas, fixture units, thermal expansion, and sewage disposal. New: Reference Tables — Built-in lookup tables for occupancy loads, brick sizes, lumber dimensions, wire gauge, concrete mixes, and insulation R-values. US & Metric toggle — Switch between US and SI units across all calculators. Favorites & History — Star your most-used formulas and access your complete calculation history. Dark mode interface — Designed for readability on the jobsite.

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1. First observed Aug 10, 2026 · 4:14 PM Free