Builder's Formulator
Calculations for Builders
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
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.
Expanded handling of metric calculations
The developer, Historycentral.com, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Historycentral.com Inc
- Size
- 49.9 MB
- Category
- Business
- Compatibility
Requires iOS 26.4 or later.
- iPhone
Requires iOS 26.4 or later. - iPad
Requires iPadOS 26.4 or later. - Mac
Requires macOS 26.4 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.4 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Builder Pro $2.99
- Copyright
- © 2026 Historycentral.com
