CaptiveAire Toolbox vs Construction Calc

The CaptiveAire Toolbox puts 40+ HVAC and building-systems engineering calculators in your pocket. Designed for engineers, contractors, and technicians, every formula uses standard industry references (ASHRAE, AMCA, NEC), sized so you can run sanity checks in the field instead of pulling out a laptop. Cooling: Total Cooling Load (enthalpy-based with humidity), Sensible Cooling Load, Latent Cooling Load, SEER, Cost of Cooling, Tons to BTU/hr conversions, DX/MPU Cooling, Evaporative Cooling, DMUA mode logic, Cooling Density Factor. Heating: BTU output for direct and indirect fired heaters, Input and Output BTU/hr for IBT systems, Temperature Rise from BTU and CFM, Heat Pump capacity with airflow and outdoor temperature adjustment, Reheat Coil leaving conditions, Manifold Pressure for natural gas and LP, Heating Density Factor. Ventilation and Airflow: Room Volume CFM, Sensible Heat CFM, Cooling Load CFM, Duct Velocity CFM, Outdoor Air Load (sensible plus latent), Psychrometric properties from dry bulb plus RH or wet bulb, Fan Energy Index per AMCA 208, Motor Adjusted Frequency for VFDs, ERV ROI Calculator with degree-day economics. Electrical Sizing: Wire Size per NEC Table, MCA and MOCP for motor circuits, Amperage from horsepower. Piping and Structural: Round Duct Sizing using Darcy-Weisbach and Colebrook-White, Duct Velocity and Friction, Piping Pressure Drop with fittings equivalent length, Pitched Roof curb height variation. Valve and Flow Sizing: Kv from flow rate, flow rate from Kv, pressure drop from Kv, Cv to Kv conversion, Heat Load to Flow Rate for water and glycol. Reference: ASHRAE Weather Station data with autocomplete address search, returning heating and cooling design temperatures, solar irradiance, wind speeds, and monthly design-day temperatures. Interactive Psychrometric Chart with property calculations. Modern HVAC versus Traditional Rooftop Unit comparison. Each calculator includes the formula and variable definitions accessible from the title bar. Tap the info icon to see exactly what equation drives the result. Built by the engineering team at CaptiveAire Systems. No tracking, no ads, no account required.

Construction Calc: Toolbox brings eight focused jobsite calculators into one app for contractors, builders, tradespeople, estimators, and serious DIY projects. Estimate materials, plan layouts, check cuts, size systems, and save job details without switching between separate apps. Work in Imperial or Metric units, including tape-style feet, inches, and fractions where supported. Core calculations work offline. EIGHT TOOLS, ONE TOOLBOX PAINT ESTIMATOR • Estimate paint and primer for walls and ceilings, accounting for openings, coats, and reserve • Get can suggestions, save rooms, and request painting guidance TILE & PLANK • Estimate tile or plank for multiple surfaces, including cutouts, waste, boxes, grout, and cost • Compare layout patterns and detailed cuts, then save, search, or duplicate projects BRICK CALCULATOR • Estimate bricks, mortar, packs, and cost using regional presets or custom sizes • Account for wall types, openings, waste, and cement, lime, and sand quantities ROOFING CALCULATOR • Create multi-plane takeoffs for shingles, underlayment, accessories, pitch, and waste • Measure roof pitch and calculate material, labor, markup, tax, and total cost FENCE CALCULATOR • Plan wood, vinyl-panel, or chain-link fences with multiple runs and gates • Estimate materials, concrete, hardware, and cost with layout warnings CROWN CUT GUIDE • Calculate miter and bevel settings for inside or outside corners and flat or nested cuts • Handle different saw types, custom spring angles, vaulted transitions, and stock estimates DUCT SIZE CALCULATOR • Size and analyze round or rectangular duct by airflow, velocity, or friction • Compare equivalent sizes and estimate pressure loss in Imperial or SI units VOLTAGE DROP • Check NEC/AWG and BS-style Metric runs across common DC and AC systems • Compare conductors, voltage drop, power loss, ampacity, and suitable wire sizes START FREE. UPGRADE ONCE. Use the core features of every calculator for free. A one-time Lifetime upgrade unlocks all Pro tools. No monthly or yearly subscription. Terms of Use - https://pipsapps.com/terms.html Privacy Policy - https://pipsapps.com/privacy.html