How to Calculate the Weight of Your Metal Project？
When choosing the right material for a metal project, you need to consider its suitability,machinability and affordability, with factors such as the material's strength, corrosion resistance and ductility.
Next, we'll focus on one of the most important considerations-the weight of the metal. Accurate weight estimates are critical to budgeting and shipping costs. This guide will learn how to calculate the weight of metal, so keep reading to save time and money on your next project.
Understanding the Formula for Metal Weight Calculation
The standard formula for calculating metal weight is: Weight (kg) = Sectional Area (mm²) × Length (m) × Density (g/cm³) × 1/1,000.This simple equation helps engineers and purchasing managers figure out exactly how heavy their metal parts will be.
How to Calculate Metal Weight
1. Determine the Sectional Area
First determine the sectional area, for which multiply the width by the height in square millimeters (mm²).
2. Determine the Length
Next, determine the length of the product in meters (m).
3. Determine the Density
Further, determine the density of the material, using the density values for materials such as steel, aluminum, or brass from the material standard tables.
4. Calculate the Weight
Let's see this formula in action with real examples. A steel plate measuring 2 m × 1 m × 10 mm weighs about 157 kg.
These calculations are vital for bulk raw material procurement, shipping costs, and structural packaging. The formula works for all common metals including stainless steel, cast iron, and aerospace aluminum.
Why Does the Weight of Your Product Matter?
Most metals are sold by weight, with denser options like stainless steel costing more than lighter aluminum. Our team at DEK has seen projects go over budget simply because weight calculations were off by small margins.
Not only does weight have a direct impact on your machinery needs, heavy metal parts can also significantly increase transportation costs, especially with today's rising freight rates.
We've helped clients avoid costly mistakes by accurately calculating weights of brass, acier, and titanium components before production begins.
Common Metals and Their Weight Calculations
Each metal has unique density characteristics and understanding their weight characteristics is critical to project planning..
| Metal Type | Densité (kg/m³) | Weight Calculation Notes | Common Applications |
| Aluminium | 2,700 | Lightest common structural metal; weighs approximately 1/3 of steel with same dimensions | Aerospace, automotive, electronics housing |
| Steel (Carbon) | 7,850 | Standard reference for many weight calculations; heavier than aluminum but offers higher strength | Construction, machinery, automotive frames |
| Acier inoxydable | 7,700-8,000 | Slightly heavier than carbon steel; corrosion resistance adds value despite weight | Food processing equipment, medical devices, kitchen appliances |
| Cuivre | 8,960 | Significantly heavier than steel; excellent electrical and thermal conductivity | Electrical wiring, plumbing, heat exchangers |
| Laiton | 8,400-8,730 | Copper-zinc alloy; weight varies based on exact composition | Decorative elements, musical instruments, plumbing fittings |
| Titane | 4,510 | About 60% the weight of steel with similar strength; excellent strength-to-weight ratio | Aerospace, medical implants, high-performance sports equipment |
Our experience shows that accurate weight calculations require precise measurements of your part's dimensions. The basic formula remains consistent across all metals: WEIGHT (KG) = VOLUME (M³) × DENSITY (KG/M³). For complex shapes, breaking down the calculation into simple geometric forms helps maintain accuracy.
Different metal shapes require specific calculation approaches. A rectangular bar uses a straightforward length × width × height × density formula, while tubes need additional steps to subtract the hollow portion's volume.
Aluminium
With a density of up to 2,700 kg/m³, aluminum is one of the most popular metals in the manufacturing industry due to its low density, strong corrosion resistance, and good electrical and thermal conductivity.
Many engineers prefer aluminum in water jet cutting applications because of its excellent strength-to-weight ratio. This material is easy to machine and cut into unique shapes, and it does not rust like steel, making it ideal for outdoor installations.
Our team provides aluminum parts such as turbine blade casings, fuel nozzles, engine components, connectors, equipment housings, and other precision CNC aluminum parts for aerospace, automotive, and consumer electronics projects.
Acier
Steel has a density of approximately 7,850 kg/m³, making it heavier than aluminum but lighter than cast iron.
Many engineers prefer steel for construction industry due to its excellent strength-to-weight ratio, durability, and structural integrity, as well as its versatility in welding and good ductility for forming into any shape.
You can use the steel weight calculation formula to calculate the weight of steel for your metal fabrication projects so that your clients can estimate shipping costs and structural requirements. You can also use the digital metal weight calculator to quickly conversion between inches and millimeters.
Acier inoxydable
Stainless steel has excellent corrosion resistance, high temperature resistance and high ductility. Different grades of stainless steel have different densities, which range from 7.7-8 g/cm³.
Duplex stainless steels offer impressive strength advantages - twice as strong as standard materials at the same thickness. This weight-to-strength ratio makes stainless steel ideal for projects that combine durability and weight.
Stainless steel is widely used in the medical, kitchen, and manufacturing industries due to its beautiful surface and ease of cleaning, and is perfect for safety rails, cutlery and containers, and medical scanning equipment housing.
Cuivre
Copper has a density of about 8.9 g/cm³ and is reddish-orange in appearance. With excellent electrical and thermal conductivity and ductility, it can be stretched into very thin foils or filaments, making it ideal for wires and fixtures in a variety of applications.
More than 60% of copper consumption is in the electrical and electronics industry, including wires and cables, PCB circuit boards, electronic components and semiconductor packaging.
Laiton
Brass is composed of zinc and copper, with a density between 8.4-8.7 g/cm³. Brass has become a core material in the fields of hardware, machinery, shipbuilding and marine engineering due to its good durability, high temperature resistance, easy processing and beautiful color.
Brass is available in different grades such as H59, H62, H68, H80 and H96, and when selecting a material, it is important to choose the right grade based on corrosion resistance, strength, and cutting requirements.
Titane
Titane has a density of 4.51 g/cm³, about 60% of steel and 1.7 times that of aluminum, making it a significant lightweight advantage.
Titanium has high strength, corrosion resistance and good biocompatibility, making it a key material for high-end industries. Half of titanium is consumed in aerospace, such as the manufacture of various aerospace components - aircraft structures, compressor blades, turbine disks. In the future, as technology advances and costs fall, titanium will be used in a wider range of applications, including medical, new energy, and consumer sectors.
Key Factors for Choosing the Right Metal
Selecting the perfect metal for your project requires careful thought about several critical factors.
Propriétés des matériaux
Different metallic materials have different physical, chemical and mechanical properties. When selecting a material, it is necessary to consider its tensile strength, hardness, toughness, abrasion resistance, corrosion resistance, electrical conductivity, thermal conductivity, and other properties that determine whether aluminum, steel, or other alloys will perform best under load.
Weight Limitations
Aluminum weighs about one-third of steel and is widely used in electric vehicles to balance cost and range. Titanium has high strength and low density of 4.5g/cm³ (about half of steel), and is lightweight, which helps reduce launch weight, increase range, and save costs, making it an ideal material for aerospace vehicles.
Usinabilité
The machinability of a metal material is one of the most important factors in material selection, including cutability, plastic deformation, weldability and ductility. Machinability affects production time and cost. Metals such as aluminum and brass are easy to cut, while metals such as titanium and kovar require special tools or techniques.
Cost Factors
Stainless steel has excellent corrosion resistance, but the price is higher than standard steel; Aluminum 7075 is known as aerospace aluminum, and its price is higher than that of aluminum 6061. aluminum alloy in the market price is about US$3 per kilogram, while titanium alloy price is about US$41 per kilogram. therefore, in order to meet the performance requirements at the same time, we should choose a reasonable price, cost-effective materials.
Résistance à la corrosion
The humidity, temperature, sunshine, rain and corrosive gas content of the atmosphere have a great influence on the corrosion of materials. When selecting materials to make fasteners for offshore oil platforms, Cl⁻ corrosion and high strength need to be considered. 316 stainless steel has corrosion resistance, but insufficient strength; duplex stainless steel 2205 and grade 5 titanium can meet its requirements, but the cost of titanium is relatively high.
Conclusion
The choice of metal not only affects weight, but also the cost, strength and various properties of the final product.
DEK meets your industrial metal products manufacturing needs in a variety of shapes and sizes. We manufacture products from more than 30 metal materials, including aluminum, stainless steel, titanium, copper and brass, and have extensive experience in CNC machining and sheet metal fabrication, aiming to provide our customers with high-quality parts.
