200 professional calculators based on ASHRAE standards
Calculate air balance for HVAC systems. Determine supply, return, exhaust, and outdoor air requirements for proper build
Calculate air changes per hour (ACH) from airflow rate and room volume.
Size air curtains for doorways to minimize infiltration and maintain building pressurization. Commonly used for loading
Calculate air distribution requirements for HVAC systems. Size supply diffusers, return grilles, and registers based on
Calculate the mixed air temperature and humidity when combining two airstreams. Essential for economizer and makeup air
Calculate air velocity from CFM and duct size, or solve for CFM or duct area from known values.
Calculate required CFM airflow based on tonnage, room size, air changes per hour, or sensible heat load.
Compare energy consumption and costs between CAV and VAV systems.
Calculate displacement ventilation system parameters for stratified air distribution.
Calculate mixing ratios for dual duct HVAC systems with hot and cold decks.
Calculate pressure loss through duct fittings using loss coefficient method for common fitting types.
Calculate pressure drop per 100 feet of straight ductwork using the Darcy-Weisbach equation. Essential for duct system d
Calculate heat gain or loss through duct walls in unconditioned spaces. Critical for maintaining supply air temperature
Calculate required duct insulation thickness to meet energy code requirements and prevent condensation.
Calculate sheet metal weight for rectangular and round ductwork based on dimensions and gauge.
Calculate duct size for HVAC systems using equal friction method. Round, rectangular, and flex duct sizing.
Calculate sound power level generated by air flowing through ductwork based on velocity and duct characteristics.
Convert duct fittings and components to equivalent straight duct length for total pressure drop calculations.
Calculate fan performance changes using the affinity laws. Determine new CFM, pressure, and horsepower when changing fan
Calculate fan brake horsepower and motor size from airflow and static pressure.
Calculate fan performance changes using fan affinity laws. Speed, flow, pressure, and horsepower relationships.
Calculate pressure drop across air filters and estimate filter life.
Calculate pressure drop in flexible duct accounting for compression ratio and friction characteristics.
Calculate zone damper positions and airflow for multizone systems.
Calculate total external static pressure for HVAC systems. Add up component pressure drops for supply and return ductwor
Calculate total external static pressure for AHU fan selection from duct and component losses.
Design underfloor air distribution (UFAD) systems including plenum depth and airflow.
Design VAV system parameters including zone airflow, diversity, and system sizing.
Size VAV boxes for commercial HVAC systems. Calculate minimum and maximum airflow, reheat coil capacity, and pressure re
Convert between BTU/hr, tons of refrigeration, kW, and watts. Quick room size to tonnage estimates.
Calculate building infiltration rates, air leakage loads, and heating/cooling impact. Use crack method or air change met
Calculate commercial HVAC cooling and heating loads using block load method. Account for occupancy, lighting, and equipm
Calculate heat gain from electrical equipment, computers, and appliances. Includes motor heat gain calculations.
Calculate heat loss and gain through building envelope components including walls, windows, roof, and floor.
Calculate heat gain from lighting systems including fluorescent, LED, and incandescent fixtures.
Calculate sensible and latent heat gain from occupants based on activity level and space type.
Calculate overall heat transfer coefficient times area (UA) for building envelope assemblies. Used in heat loss/gain cal
Calculate residential HVAC load using simplified Manual J method. Determine cooling and heating BTU requirements for hom
Calculate cooling load from roof heat gain using CLTD method.
Calculate sensible heat ratio (SHR), sensible and latent cooling loads from airflow and temperature conditions.
Calculate effective SHGC accounting for window orientation, overhang shading, and interior shading devices.
Calculate instantaneous solar heat gain through fenestration based on orientation, shading, and glass properties.
Calculate heat gain through exterior walls using U-factor and temperature difference. Includes solar heat gain effects.
Calculate solar and conductive heat gain through windows using SHGC, U-factor, and orientation.
Calculate the total heat content (enthalpy) of moist air for energy analysis and heat exchanger sizing.
Calculate temperature at each layer in a wall assembly to determine if condensation will occur at any interface.
Calculate dew point temperature from dry bulb and relative humidity using the Magnus-Tetens formula.
Calculate grains of moisture per pound of dry air. Commonly used in dehumidification and humidity control applications.
Calculate humidity ratio, grains of moisture, and specific humidity from dry bulb temperature and relative humidity usin
Calculate vapor pressure difference across wall assembly to assess moisture risk and determine vapor retarder requiremen
Calculate outdoor air enthalpy for economizer control decisions.
Calculate psychrometric air properties: humidity ratio, enthalpy, dew point, wet bulb temperature from dry bulb and rela
Calculate the volume occupied by one pound of moist air. Essential for converting between mass and volume flow rates.
Calculate wet bulb temperature from dry bulb temperature and relative humidity using psychrometric relationships.
Verify adequate refrigerant velocity for oil return to compressor.
Size refrigeration compressor based on cooling capacity and operating conditions.
Size air-cooled or water-cooled condenser for refrigeration system.
Calculate heat pump defrost cycle timing and energy impact. Analyze defrost frequency, duration, and efficiency loss.
Size direct expansion cooling systems including refrigerant charge and airflow.
Convert between Energy Efficiency Ratio (EER), Seasonal Energy Efficiency Ratio (SEER), and Heating Seasonal Performance
Calculate required evaporator coil surface area and airflow for refrigeration applications.
Calculate coefficient of performance for heat pump systems.
Pressure-temperature saturation chart for HVAC refrigerants. R-410A, R-22, R-32, R-134a lookup tables.
Calculate refrigerant charge adjustment for HVAC systems. Account for line set length beyond factory charge.
Calculate refrigerant leak rate and annual loss from pressure decay test.
Calculate refrigerant velocity in suction and liquid lines to ensure proper oil return.
Size refrigerant liquid line piping based on capacity, length, and pressure drop criteria.
Calculate refrigerant charge migration and minimum crankcase temperature to prevent liquid slugging.
Size refrigerant suction and liquid lines for HVAC systems. Calculate pressure drop, velocity, and oil return for R-410A
Size refrigerant suction line for proper velocity, pressure drop, and oil return.
Calculate superheat and subcooling from measured pressures and temperatures for system diagnosis.
Calculate Coefficient of Performance (COP) for refrigeration systems based on evaporator and condenser temperatures.
Calculate performance improvement from liquid subcooling and hot gas desuperheating.
Calculate subcooling for HVAC systems with TXV metering devices. Verify proper refrigerant charge and system performance
Calculate superheat for HVAC systems with fixed orifice metering devices. Target superheat based on indoor and outdoor c
Size thermostatic expansion valve (TEV/TXV) for refrigeration system based on capacity and pressure drop.
Calculate overall system coefficient of performance including all components.
Optimize boiler staging for multiple boiler heating plants.
Calculate boiler capacity for hydronic heating systems. Size hot water and steam boilers based on heat load, building ty
Calculate heat transfer in hydronic systems from flow rate and temperature change.
Analyze and optimize chilled water temperature difference for system efficiency.
Calculate chilled water pipe size and pressure drop for hydronic systems.
Calculate condensate drain line sizing for air conditioning systems. Determine drain rate, pipe size, and trap requireme
Calculate expansion tank sizing for hot water and chilled water hydronic systems. Size diaphragm and bladder tanks based
Size natural gas and propane piping per fuel gas code. Calculate pipe diameter based on BTU load and pipe length.
Calculate glycol concentration for freeze protection and system properties. Determine heat transfer capacity, viscosity,
Calculate correction factors for glycol solutions in hydronic systems.
Size hot water piping based on flow rate and velocity limits per ASHRAE standards.
Calculate outdoor air reset schedule for hot water heating systems.
Size chilled water and hot water piping for HVAC hydronic systems. Calculate flow velocity, pressure drop, and pipe diam
Calculate balancing valve settings and flow distribution for hydronic systems.
Calculate required insulation thickness for pipes to prevent condensation and minimize heat loss.
Calculate thermal expansion of hydronic piping and required expansion loop or joint sizing.
Calculate thermal expansion stress in piping systems due to temperature changes.
Calculate pump performance changes using affinity laws. Speed changes affect flow, head, and power for HVAC hydronic sys
Calculate total dynamic head for chilled water pumps. Includes friction loss, elevation, and equipment pressure drops pe
Calculate pump power requirements for hydronic systems based on flow and head.
Calculate condensate load from steam systems based on steam flow rate and pressure conditions.
Calculate steam pipe sizing based on flow rate, pressure, and velocity. Size supply and condensate return lines per ASHR
Calculate infiltration heat loss and determine effective leakage area from air barrier performance.
Calculate minimum outdoor air ventilation requirements per ASHRAE Standard 62.1 using the Ventilation Rate Procedure.
Interpret blower door test results, calculate ACH50, estimate natural infiltration, and compare to energy code requireme
Calculate required supply/exhaust airflow to maintain positive or negative building pressure per ASHRAE 62.1 and IMC.
Calculate required air changes per hour for cleanroom classification based on ISO 14644-1 standards.
Calculate number and sizing of HEPA filters required for cleanroom based on airflow and coverage requirements.
Calculate required exhaust CFM for commercial kitchen hoods based on appliance type, hood type, and ASHRAE/IMC standards
Calculate hood exhaust requirements for commercial kitchen equipment.
Calculate outdoor air requirements based on occupancy using CO2 sensors for demand control ventilation.
Calculate airflow and pressure differential requirements for hospital isolation rooms per CDC and FGI guidelines.
Calculate capture velocity and exhaust requirements for industrial hoods per ACGIH standards.
Calculate required exhaust airflow for commercial kitchen hoods based on appliance type and hood configuration.
Calculate exhaust requirements for laboratory fume hoods and safety cabinets per ASHRAE 110 and ANSI Z9.5 standards.
Calculate face velocity and airflow for laboratory chemical fume hoods.
Size makeup air units for commercial kitchen and exhaust applications.
Calculate cooling potential from night ventilation using thermal mass.
Calculate ventilation requirements for paint spray booths per NFPA 33.
Calculate ventilation requirements for enclosed parking garages based on IMC/IBC codes and ASHRAE standards.
Calculate ventilation requirements for enclosed parking garages per ASHRAE 62.1.
Calculate supply and exhaust airflow to achieve desired room pressure differential for clean rooms, hospitals, and labor
Calculate cooling and ventilation requirements for server rooms and data centers.
Estimate annual energy cost for heating and cooling outdoor ventilation air based on climate and system type.
Calculate ventilation requirements per ASHRAE 62.1 and 62.2 standards for commercial and residential buildings.
Calculate local exhaust ventilation for welding operations.
Calculate total thermal resistance of a roof assembly including air films, roofing membrane, insulation, and deck.
Calculate effective wall R-value accounting for thermal bridging through framing members using parallel path method.
Calculate thermal mass effects and temperature swing reduction in buildings.
Calculate total thermal resistance (R-value) of a wall assembly by summing individual layer resistances.
Calculate overall window U-factor from center-of-glass, edge-of-glass, and frame components using area-weighted average.
Size air handling units for commercial HVAC systems. Calculate airflow, coil capacity, fan requirements, and component s
Calculate performance of plate heat exchangers for air-to-air energy recovery.
Optimize chiller staging and sequencing for multiple chiller plants.
Calculate chiller capacity, tonnage requirements, chilled water flow rates, and energy efficiency for commercial HVAC sy
Verify heating or cooling coil performance by comparing measured capacity to design specifications.
Select and size heating and cooling coils for AHUs. Calculate face velocity, rows required, water flow, and entering/lea
Calculate condenser water flow rate and temperature for chiller systems.
Calculate cooling coil bypass factor and apparatus dew point for AHU coil selection.
Calculate cooling tower approach temperature and performance parameters.
Calculate cooling tower capacity, water flow rate, evaporation rate, and thermal efficiency for HVAC applications.
Calculate cooling requirements for data center based on IT load, redundancy, and efficiency metrics.
Calculate dehumidifier capacity for residential and commercial applications. Size based on moisture load, space volume,
Calculate total energy recovery including sensible and latent heat transfer.
Calculate ground loop heat exchanger requirements for geothermal heat pump systems.
Calculate heat exchanger sizing for HVAC applications. Size plate and shell-and-tube heat exchangers using LMTD and NTU
Size heat recovery ventilators (HRV) and energy recovery ventilators (ERV). Calculate sensible and latent energy recover
Calculate effectiveness and energy recovery for enthalpy wheels.
Calculate heating coil sizing for AHU and duct applications. Size hot water and steam coils based on airflow, temperatur
Size humidifiers based on building volume, infiltration rate, and desired humidity level for residential and commercial
Convert HVAC units: temperature, pressure, airflow, energy, and more. Essential conversions for HVAC professionals.
Calculate mini-split sizing for ductless heating and cooling. Size single and multi-zone systems based on room loads and
Design HVAC system for natatorium facilities including air distribution and moisture control.
Select packaged rooftop units based on load and ventilation requirements.
Calculate cooling required to remove heat from industrial process equipment or manufacturing operations.
Calculate performance of run-around coil energy recovery systems.
Calculate performance of sensible-only heat recovery wheels.
Match outdoor condensing units with indoor evaporator coils for split systems.
Calculate dehumidification load for indoor swimming pool facilities.
Calculate required discharge air temperature for VAV systems.
Calculate economizer changeover point and outdoor air enthalpy control settings.
Calculate annual energy savings from air-side economizer operation based on climate and system parameters.
Calculate economizer free cooling hours and energy savings. Analyze outdoor air economizer cycles for commercial HVAC sy
Calculate optimal staging logic for multi-stage heating and cooling equipment.
Calculate energy savings from night and weekend temperature setback strategies.
Calculate PID controller tuning parameters using Ziegler-Nichols method.
Calculate optimal supply air temperature reset based on zone demand.
Calculate optimal supply air temperature reset based on zone demand.
Estimate annual energy consumption using temperature bin analysis for more accurate load profiling.
Estimate heating or cooling energy using degree day method for building load analysis.
Calculate moisture removal and regeneration requirements for desiccant systems.
Size energy recovery ventilators (ERV) and heat recovery ventilators (HRV). Calculate energy savings and payback period
Size energy recovery ventilators (ERV/HRV) and calculate energy savings from heat and moisture recovery.
Calculate effectiveness and performance of direct and indirect evaporative coolers.
Calculate proper belt tension for HVAC fan drives.
Calculate potential energy savings from common HVAC efficiency improvements.
Analyze performance and operating modes for hybrid HVAC systems combining multiple technologies.
Calculate radiant floor heating requirements including loop length, tube spacing, water temperature, and BTU output per
Calculate snow melting system requirements for driveways, sidewalks, and parking areas. Size boiler, tubing, and glycol
Calculate thermal energy storage system sizing for ice storage and chilled water tanks. Optimize for peak demand reducti
Calculate sound power level from equipment based on sound pressure measurements at a known distance.
Calculate Noise Criteria (NC) rating from octave band sound pressure levels for occupied spaces.
Calculate room constant and reverberant sound level based on room surface absorption coefficients.
Size fire and smoke dampers for HVAC duct penetrations.
Calculate pressure differential requirements for smoke control systems per NFPA 92.
Calculate smoke exhaust requirements for atrium and large spaces.
Design stairwell pressurization systems for fire safety and smoke control.
Calculate airflow from field measurements using capture hood, duct traverse, or pitot tube methods per ASHRAE standards.
Assess draft risk and local discomfort from air movement per ASHRAE 55.
Assess floor temperature for thermal comfort and radiant heating systems.
Calculate mean radiant temperature (MRT) from surface temperatures and view factors.
Calculate operative temperature for thermal comfort assessment.
Calculate Predicted Mean Vote (PMV) and Predicted Percentage Dissatisfied (PPD) per ASHRAE 55.
Calculate percent deviation from design airflow and determine if air balancing meets acceptance criteria.
Calculate water flow rate from differential pressure measurement across a balancing valve or calibrated balancing cock.