Duct Weight Calculator

Duct weight varies by type and shape. For rectangular ducts, use the formula: Weight (kg) = Volume (m³) x Density (kg/m³). For round ducts, it’s Weight (kg) = π * (Diameter/2)² * Length (m) * Density (kg/m³). Oval, spiral, and irregular ducts require specialized calculations based on their geometry. Insulated ducts combine the weight of the insulation and the duct material.

Duct Weight Calculator

Duct Weight Calculator

Duct Type/ShapeFormula to Calculate Weight
Rectangular DuctWeight (kg) = Volume (m³) x Density (kg/m³)
Round DuctWeight (kg) = π * (Diameter/2)² * Length (m) * Density (kg/m³)
Oval DuctWeight (kg) = π * (Width/2) * (Height/2) * Length (m) * Density (kg/m³)
Spiral DuctWeight (kg) = π * (Diameter/2) * Length (m) * Density (kg/m³)
Flat Oval DuctWeight (kg) = π * (Width/2) * (Height/2) * Length (m) * Density (kg/m³)
Irregular ShapeWeight calculation may require breaking it down into simpler shapes and summing up their weights.
Insulated DuctWeight (kg) = Volume of insulation (m³) x Density of insulation (kg/m³) + Weight of duct without insulation (kg)

In these formulas:

  • Volume is the cross-sectional area multiplied by the length of the duct.
  • Density is the density of the material the duct is made of.
  • Diameter is the diameter of the round or spiral duct.
  • Width and Height are the dimensions of rectangular, oval, or flat oval ducts.
  • Length is the length of the duct.
  • For insulated ducts, you calculate the weight of the insulation separately and add it to the weight of the duct without insulation.

Here’s a table showing the approximate weight of ductwork in pounds per linear foot (PLF) for different types and materials of ducts:

Duct TypeMaterialWeight (PLF)
RectangularGalvanized Steel3.0 – 5.0
RectangularAluminum1.5 – 3.0
RectangularStainless Steel4.0 – 6.0
RoundGalvanized Steel2.5 – 4.0
RoundAluminum1.0 – 2.0
RoundStainless Steel3.5 – 5.0
SpiralGalvanized Steel3.5 – 6.0
SpiralAluminum2.0 – 3.5
SpiralStainless Steel5.0 – 7.0
Flexible DuctInsulated0.5 – 1.0
PVC DuctPVC1.0 – 2.0
Fiberglass DuctFiberglass1.0 – 2.5
Fabric DuctFabric0.2 – 0.5

Please note that these values are rough estimates and can vary depending on the gauge (thickness) of the duct material, the size of the duct, and whether the duct is insulated. Additionally, local building codes and engineering standards may dictate specific requirements for ductwork, including weight considerations.


How do you calculate the weight of a duct? The weight of a duct can be calculated by multiplying its volume by the density of the material it’s made of. The formula is:

See also  Channel Weight Calculator

Weight (in kg) = Volume (in m³) x Density (in kg/m³)

How heavy is a duct? The weight of a duct depends on its size, shape, and the material it’s made of. A typical air duct made of galvanized steel can weigh between 1 to 4 kg per linear meter.

How much does duct insulation weigh? The weight of duct insulation varies depending on the type and thickness of the insulation material used. It can range from 1 kg to 4 kg or more per square meter.

What is the calculating weights formula? The formula to calculate the weight of an object is:

Weight (in kg) = Mass (in kg) x Acceleration due to gravity (usually 9.81 m/s²)

What is duct calculator? A duct calculator is a tool or software used to calculate various parameters related to HVAC ductwork, such as size, airflow, pressure drop, and more. It helps in designing and optimizing duct systems.

How do you calculate duct load? Duct load calculation involves determining the heating or cooling load that a duct system must handle. It includes factors like air temperature, humidity, and the area being served. The calculation is complex and is typically done using specialized software.

How do you calculate duct m2? To calculate the area (in square meters) of a duct’s cross-section, you can use the formula:

Area (m²) = Width (m) x Height (m)

What is the formula for weight per unit length? Weight per unit length (linear density) can be calculated using the formula:

Weight per unit length (kg/m) = Weight (kg) / Length (m)

How much duct do I need? The amount of duct needed depends on the size and layout of the HVAC system and the building’s design. A professional HVAC engineer or technician typically calculates the required duct length and size based on the specific project requirements.

What is the average size of ducts? The average size of HVAC ducts can vary widely depending on the application. Residential ducts are often in the range of 100mm x 150mm (4″ x 6″) to 450mm x 600mm (18″ x 24″), while commercial or industrial ducts can be much larger.

How are ducts measured? Ducts are typically measured in terms of their cross-sectional dimensions, which include width, height, and sometimes diameter (for round ducts). The measurements are usually in millimeters or inches.

See also  Hollow Metal Door Weight Calculator

What is the difference between a vent and a duct? A vent is an opening or outlet that allows air or gas to exit a space, while a duct is a channel or pipe that carries air or other substances from one location to another. Ducts can have vents as openings along their length to distribute or exhaust air.

Is duct measured by ID or OD? Ducts are often measured by their outside diameter (OD) for round ducts and by their inside dimensions (ID) for rectangular or square ducts.

How thick is typical ducting? The thickness of ducting varies depending on the material and application. Common duct materials like galvanized steel or aluminum can have thicknesses ranging from 0.5 mm to 1.5 mm or more.

How much does pipe insulation weigh per meter? The weight of pipe insulation per meter depends on the type and thickness of the insulation material used. It can range from 0.5 kg/m to 4 kg/m or more.

How do you calculate duct insulation? Duct insulation is typically calculated based on the surface area of the duct and the thickness of the insulation material. The formula is:

Insulation Weight (kg) = Area (m²) x Thickness (m) x Density (kg/m³)

What is insulation weight? Insulation weight is the mass of insulation material applied to a surface, such as a duct or pipe, to provide thermal protection.

How can I measure my weight without a weight machine? You can estimate your weight without a weight machine by using a bathroom scale, or you can use a formula like BMI (Body Mass Index) based on your height and weight.

How do you calculate weight from diameter? To calculate the weight of a cylindrical object (like a duct) from its diameter, you would need more information, such as its length and the material it’s made of. The formula for calculating the volume of a cylinder is π * (Diameter/2)² * Length, and you can then use the density of the material to find the weight.

What are the methods used to determine the right weight? Determining the right weight for an object depends on its purpose. For personal weight management, methods include weighing scales, body mass index (BMI), and body composition analysis. For objects like ducts, it involves calculating weight based on material, dimensions, and density.

What is the rule of thumb for duct sizing? A common rule of thumb for residential HVAC duct sizing is to provide 1 CFM (cubic foot per minute) of airflow for every square foot of conditioned floor space. However, it’s important to perform a detailed duct sizing calculation for accurate results.

See also  Plastic Film Weight Calculator

How do you calculate duct volume? To calculate the volume of a duct, you can use the formula for the volume of a rectangular duct:

Volume (m³) = Width (m) x Height (m) x Length (m)

For a round duct, use the formula for the volume of a cylinder:

Volume (m³) = π * (Diameter/2)² * Length (m)

What is the formula for duct flow? The formula for calculating the airflow (in cubic meters per second or cubic feet per minute) through a duct is:

Airflow (m³/s or CFM) = Velocity (m/s or ft/min) x Cross-sectional Area (m² or sq. ft)

What is the total pressure in a duct? Total pressure in a duct is the sum of static pressure and velocity pressure. It is a measure of the total energy in the airflow and is important in HVAC design and analysis.

What is the formula for HVAC load? The formula for calculating HVAC load (heating or cooling load) depends on various factors, including building size, insulation, climate, and occupancy. It often involves complex calculations and is typically done using specialized software.

What is a load calculation in HVAC terms? An HVAC load calculation is the process of determining the heating and cooling requirements of a building. It considers factors like heat gain/loss, temperature differentials, and equipment sizing to ensure proper HVAC system design.

What size duct do I need for a 12×12 room? The size of the duct needed for a 12×12 room depends on several factors, including the room’s insulation, the HVAC system’s capacity, and the desired airflow. A professional HVAC engineer should perform a duct sizing calculation for accurate results.

What size ductwork for a 2.5-ton unit? The size of ductwork for a 2.5-ton HVAC unit depends on the specific application, including the layout of the duct system and the type of ducts used. A professional HVAC designer or engineer can determine the appropriate duct size based on load calculations.

What is the size of a standard duct opening? The size of a standard duct opening can vary, but common rectangular and square duct sizes for residential HVAC systems are often in the range of 100mm x 150mm (4″ x 6″) to 450mm x 600mm (18″ x 24″). Circular ducts come in various diameters depending on the application.

Stainless steel duct weight calculator, square duct weight calculator, circular duct weight calculator, HVAC duct weight calculator Excel, SMACNA duct weight calculator, HVAC duct weight calculator, duct weight calculator in kg, duct weight calculator in mm. These are tools or resources that can help you calculate the weight or dimensions of different types of ducts, depending on their shape, material, and specifications. You can find online calculators and Excel spreadsheets designed for these calculations.

Leave a Comment