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Interactive Estimating Instruments (Try Changing Inputs Below)
Five Specialized Trade Suites
Construction & Framing
Calculators for concrete slabs, footings, lumber framing, roof pitch, rafters, stairs, and decks.
Materials & Takeoff
Estimating weights, bulk volume, gravel tonnage, drywall sheets, joint compound, and waste allowances.
Electrical & Conduit
Wire gauge sizing, voltage drop, conduit fill, electrical box fill, and service panel load calculations.
HVAC & Airflow
BTU sizing, heating & cooling loads, AC tonnage, duct sizing, CFM airflow, and ventilation calculators.
Plumbing & Drainage
Drainage fixture units (DFU), sanitary drain pipe sizing, soil stacks, building drains, and venting calculators.
Deterministic Mathematical Rigor
Zero heuristic drift. Every calculation uses exact physical formulas with verified unit conversions.
Published Code Reference Schedules
Calibrated against standard published trade reference schedules: NEC 2023 Tables, IPC/UPC 2024, and IRC 2024.
100% Free & Transparent Takeoffs
No paywalls, no email gates, no subscriptions. Transparent step-by-step math breakdowns and print-ready worksheets.