Editor In Chief Estimate airflow in cubic feet per minute for a round duct using duct diameter, air velocity, system type, and airflow condition. The calculation uses duct cross-sectional area times air velocity, with adjustment factors for typical HVAC system behavior.
Estimate the recommended flexible duct diameter based on required airflow, target air velocity, equivalent duct length, and fitting count. The calculation first determines ideal diameter from airflow and velocity, then adds a sizing factor for longer runs and additional fittings to reflect practical installation conditions.
Estimate airflow in cubic feet per minute (CFM) for a round or rectangular duct using duct dimensions and air velocity.
Calculate the surface area of a round duct section using duct diameter and length. This calculator estimates the lateral sheet metal area of a cylindrical round duct and can also account for a quantity of identical duct sections.
Calculate the surface area of a rectangular or round duct section using duct length and dimensions. Useful for estimating insulation, cladding, or sheet metal coverage.
Convert a round duct size and airflow target into an equivalent rectangular duct area and estimated rectangular dimensions based on a chosen aspect ratio and friction allowance.
Calculate the equivalent round duct diameter from a rectangular duct using width and height. This helps estimate a round duct size that provides similar airflow characteristics to a square or rectangular duct transition.
Estimate the required rectangular duct cross-sectional area from airflow and target velocity, then calculate one duct dimension when the other dimension is known.
Calculate the required square duct side length based on airflow, target air velocity, and an optional safety factor for duct sizing.
Estimate the required round duct diameter based on airflow, target air velocity, system type, and fitting complexity. This calculator uses the duct sizing relationship between airflow and velocity to compute an equivalent round duct diameter.
Estimate the recommended return air duct size in square inches based on airflow, target return air velocity, number of return grilles, and a safety factor for system resistance and layout.
Estimate the installed cost of HVAC ductwork based on total duct length, duct width, material, insulation level, and installation difficulty.
Estimate the recommended rectangular supply duct cross-sectional area based on airflow, target air velocity, system type, and duct material. This calculator helps size a main supply duct using standard HVAC airflow and velocity relationships.
Estimate the required rectangular duct cross-sectional area for a commercial HVAC branch using airflow, target air velocity, friction loss factor, and system type. The result helps size ducts in square inches for preliminary design.
Estimate recommended residential round duct diameter based on target airflow, friction rate, duct material, and total effective length. This simplified calculator helps size a main branch duct for typical home HVAC applications.
Estimate the recommended rectangular air duct cross-sectional area based on airflow, target air velocity, and system type, then convert that area into an equivalent round duct diameter for HVAC sizing.
Estimate the required round duct diameter for an HVAC branch based on airflow, target air velocity, duct material, and system type. This calculator uses the airflow equation for round ducts and applies practical adjustment factors for friction and design conditions.
Estimate required HVAC duct size in square inches based on airflow, target air velocity, duct type, run length, and fitting complexity.
Estimate the recommended round duct diameter based on airflow, target air velocity, friction loss factor, and system type. This calculator provides an approximate duct size for HVAC planning.
Calculate recommended round duct diameter based on airflow, target air velocity, duct material factor, and system layout factor. This helps estimate an appropriate duct size for HVAC airflow distribution.
Estimate the cooling or heating capacity needed in BTU per hour based on room size, ceiling height, insulation quality, sun exposure, and number of occupants.
Convert cooling capacity from BTU per hour to refrigeration tons. Adjust for equipment efficiency and load conditions to estimate effective tonnage for HVAC sizing.
Convert heating capacity from MBH to BTU per hour, with options to calculate from a single MBH value or multiply by quantity for total BTU/h output.
Estimate required airflow in CFM from cooling capacity in BTU/hr using the sensible heat equation with configurable temperature difference and elevation adjustment.
Estimate heating or cooling capacity in BTU per hour from airflow in CFM using the standard HVAC relationship BTU/hr = 1.08 × CFM × temperature difference. Choose heating or cooling and enter airflow, supply air temperature, and return air temperature.
Convert cooling or heating capacity from BTU per hour to kilowatts, with options to view electrical input power based on system efficiency.
Convert electrical power in kilowatts to BTU per hour with optional efficiency and runtime inputs for estimating heat output and total BTUs over a period.
Convert cooling or heating capacity from BTU per hour to watts, with options to show electrical input watts based on equipment efficiency using EER or COP.
Convert electrical power in watts to BTU per hour, with optional efficiency and operating time inputs to estimate effective heat output and total BTUs over a usage period.
Convert cooling capacity in tons to BTU per hour, with optional runtime and efficiency inputs to estimate total BTU delivered over time and adjusted output.