HVAC tools
Practical calculators
Start with the specific calculation, then check its assumptions with the related guide or reference.
Load planning
Load to capacity
Transparent preliminary component aggregation and capacity conversion.
HVAC Load Calculator
Aggregate preliminary cooling and heating load components.
BTUBTU Calculator
Convert thermal capacity units.
BTUBTU to Tons
Convert BTU/h to refrigeration tons.
BTURoom BTU Calculator
Create a documented preliminary area-based value.
BTUBTU per Square Foot
Compare a stated thermal capacity with a documented floor area.
BTUTons to BTU
Convert nominal refrigeration tons to BTU/h and thermal kW.
Airflow
Volume-flow checks
Identify the air stream and keep CFM, ACH, and metric conversions separate.
CFM Calculator
Convert room volume and ACH to CFM.
AIRFLOWACH Calculator
Calculate the ACH implied by a stated CFM flow.
AIRFLOWCFM per Square Foot
Normalize a known airflow by served floor area.
AIRFLOWCFM to m3/h
Convert airflow units without changing the design basis.
AIRFLOWm3/h to CFM
Convert cubic metres per hour to CFM without changing the flow basis.
Duct design
Geometry to resistance checks
Use a documented CFM basis, then review size, area, velocity, and straight-run friction.
Duct Size Calculator
Estimate a theoretical round diameter from CFM and velocity.
DUCTRectangular Duct Size
Calculate preliminary width and height.
DUCTDuct Velocity
Check round or rectangular face velocity.
DUCTDuct Cross-Sectional Area
Calculate round or rectangular inside face area.
DUCTEquivalent Diameter
Compare rectangular and round equal-friction geometry.
DUCTDuct Friction Loss
Estimate transparent straight-round-duct loss.
Refrigeration
Measured refrigeration checks
Use documented refrigerant state points and measured line temperatures; these tools do not set charge or service targets.
Refrigeration Capacity
Calculate refrigerant-side capacity from mass flow and enthalpy difference.
REFRIGERATIONRefrigerant Superheat
Find the suction-line temperature difference above saturation.
REFRIGERATIONRefrigerant Subcooling
Find the liquid-line temperature difference below saturation.
Psychrometrics
Moist-air properties
Calculate related humidity properties from one documented air state.