Engineering tools for
field contractors.
Free calculators built on the same engineering math and dispatch logic Proof OS runs in production. No login, no email gate.
Psychrometric GPP & Dew Point Calculator
Calculate Grains Per Pound (GPP), Dew Point (°F), Vapor Pressure, and LGR grain depression for insurance-grade drying logs and psychrometric chambers.
Open tool → Roofing // Slope & MaterialRoof Square & Pitch Estimator
Estimate true roof surface squares, pitch slope multipliers (4/12 to 12/12), complexity waste allowances, and shingle bundle counts for storm supplements.
Open tool → Plumbing // Leak DetectionSlab Leak & Repair ROI Calculator
Calculate sub-slab water loss volume, monthly utility waste, and non-invasive acoustic pinpoint repair ROI versus whole-slab jackhammer trenching.
Open tool → HVAC // ACCA Manual DHVAC CFM Airflow & Duct Sizing Calculator
Calculate target CFM airflow per ton of cooling capacity, round duct sizing, and dehumidification split targets across humid vs dry climates.
Open tool → IICRC S500IICRC Water Damage Matrix
Determine IICRC Category (1/2/3) and Class (1/2/3/4) for a water loss in under 60 seconds using contamination source, material porosity, and saturation extent.
Open tool → PsychrometricsDehumidifier Sizing Calculator
AHAM-rated dehu capacity converted to derated real-world pull rate, with grain-depression math against your job site's ambient psychrometric readings.
Open tool → Algorithmic DispatchFleet Efficiency Calculator
Compare your current dispatch latency, deadhead miles, and revenue-per-truck against industry benchmarks for trade operators running 2 to 20 trucks.
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