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Online Metal Weight Calculator
A metal weight calculator helps quickly estimate the mass of metal products without using reference tables or manual formulas. The calculation principle is simple: first the volume of the element is determined based on its geometry, and then the volume is multiplied by the material density. For most steel applications in construction and engineering, a standard density of 7850 kg/m³ is used. However, the calculator allows you to change the density if you are working with another metal such as aluminum, copper, or stainless steel. For profiles that have a defined length, the volume is calculated as cross-sectional area × length. The cross-sectional area depends on the element type: for a round bar it is the area of a circle, for a pipe it is the difference between two circles (outer and inner), for a rectangular tube it is the difference between two rectangles, for a flat bar it is width multiplied by thickness, and for a square bar it is the square of the side length. For sheet metal, the volume is calculated as width × height × thickness, and length in meters is not required. After calculating the mass, the calculator can also include a waste or allowance percentage, which is useful when cutting material or accounting for production losses. It is important to remember that the result is an estimated value. The actual weight may differ slightly due to manufacturing tolerances, rounded corners, wall thickness variations, coatings, or other production characteristics. For channel and I-beam sections, it is often more accurate to use the kg/m mode (mass per linear meter from steel standards) rather than simplified geometry calculations.
Frequently Asked Questions
How does the metal weight calculator work?
The algorithm consists of two steps: 1) calculating the volume based on dimensions (cross-sectional area × length or width × height × thickness for sheet metal), and 2) multiplying the volume by the material density. A waste percentage can also be applied if needed.
What density should be used for steel?
The typical density for structural steel is 7850 kg/m³. If you are working with another metal or alloy, simply enter the appropriate density value to obtain an accurate result.
Why may the calculated weight differ from the actual weight?
The difference may occur due to manufacturing tolerances, geometric deviations, rounded corners, coatings, profile production features, and material losses during cutting or installation.
How do you calculate the weight of a round pipe?
Enter the outer diameter D and wall thickness t. The inner diameter equals D − 2t. The cross-sectional area of the pipe is calculated as the difference between the outer and inner circle areas, which is then multiplied by the length.
How do you calculate sheet metal or strips from sheet?
For sheet metal, enter the width, height, and thickness — the length in meters is not required. For strips cut from sheet metal, you need the width, thickness, and total length in meters (linear meters), since the weight depends on the total strip length.
Channel and I-beam: which mode should I choose — kg/m or geometry?
If you have standard steel data, choose the kg/m mode because it is faster and more accurate. The geometry mode is useful for approximate estimates when the exact mass per meter is unknown or when evaluating non-standard profiles.