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Plate Weight Calculator


From square and rectangular to round metal plates, this handy plate weight calculator makes it easy to calculate the weight of plates in various materials, including stainless steel, mild steel, aluminum, and others.

If you have any issues or require technical assistance, refer to the user guide below the calculator. We’ve also included a set of handy tutorials to show you how to manually calculate the weight of metal plates if you’d prefer to bypass the calculator.

Plate Weight Calculator:
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Total Weight = 0.00 lbs / 0.00 kg
Disclaimer: The weights shown in the above calculator are for guidance only and should not form the basis of any calculations where precise or accurate information is required. It isn’t uncommon for theoretical metal weights and densities to vary considerably from actual weights and densities, for example, due to differences in manufacturing processes and material compositions. Therefore, you should obtain relevant, accurate information from manufacturers if exact weight calculations are required.

How to Use the Plate Weight Calculator

  1. The first step is choosing the plate type for your calculation, with square, rectangular, and round plates available from the ‘Select a Plate Type’ dropdown.

  2. You can change the material used for the plate(s) in your calculation via the ‘Material’ dropdown in box (2). Options include stainless steel (ss), mild steel (ms), aluminum, and copper.

    The ‘Density’ box will automatically be populated based on the material type you choose.

    You can update the ‘Density’ figure if needed, although we’ve based the figure used for each material on industry guidance.

  3. You can change how many plates you include in your calculation by updating the ‘Quantity’ dropdown in box (2).
  4. Depending on the plate type chosen for your calculation, you’ll need to enter various dimensions, for example, ‘Length’, ‘Width’, ‘Diameter’, and ‘Thickness’.

    The calculator will automatically reformat depending on the type of plate profile chosen, meaning only the relevant dimensions will be shown.

    You can select the relevant units for each measurement using the ‘Unit’ dropdowns, including millimeters, centimeters, meters, inches, and feet.

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    Note: If you choose ‘inch’ as a unit, you’ll need to use either whole or decimal numbers instead of fractions. For example, 0.25 instead of 1/4.

    We’ve included a handy conversion table of standard material dimensions that you can use in the plate weight calculator. Click the button below to view the table:


    • Plate Weight Calculator – Inch to Decimal Conversion Table

      1/8

      0.125

      1-9/16

      1.5625

      3-5/8

      3.625

      5/32

      0.15625

      1-5/8

      1.625

      3-11/16

      3.6875

      3/16

      0.1875

      1-11/16

      1.6875

      3-3/4

      3.75

      7/32

      0.21875

      1-3/4

      1.75

      3-13/16

      3.8125

      1/4

      0.25

      1-13/16

      1.8125

      3-7/8

      3.875

      9/32

      0.28125

      1-7/8

      1.875

      3-15/16

      3.9375

      5/16

      0.1325

      1-15/16

      1.9375

      4

      4.00

      11/32

      0.34375

      2

      2.00

      4-1/8

      4.125

      3/8

      0.375

      2-1/16

      2.0625

      4-3/16

      4.1875

      13/32

      0.40625

      2-1/8

      2.125

      4-1/4

      4.25

      7/16

      0.4375

      2-3/16

      2.1875

      4-5/16

      4.3125

      15/16

      0.9375

      2-1/4

      2.25

      4-3/8

      4.375

      1/2

      0.5

      2-5/16

      2.3125

      4-7/16

      4.4375

      17/32

      0.53125

      2-3/8

      2.375

      4-1/2

      4.50

      9/16

      0.5625

      2-7/16

      2.4375

      4-9/16

      4.5625

      19/32

      0.59375

      2-1/2

      2.50

      4-5/8

      4.625

      5/8

      0.625

      2-9/16

      2.5625

      4-11/16

      4.6875

      11/16

      0.6875

      2-5/8

      2.625

      5

      5.00

      3/4

      0.75

      2-11/16

      2.6875

      5-1/16

      5.0625

      13/16

      0.8125

      2-3/4

      2.75

      5-1/8

      5.125

      7/8

      0.875

      2-7/8

      2.875

      5-3/16

      5.1875

      13/16

      0.8125

      2-15/16

      2.9375

      5-1/4

      5.25

      15/16

      0.9375

      3

      3.00

      5-3/8

      5.375

      1

      1.00

      3-1/16

      3.0625

      5-7/16

      5.4375

      1-1/16

      1.0625

      3-1/8

      3.125

      5-1/2

      5.50

      1-1/8

      1.125

      3-3/16

      3.1875

      5-5/8

      5.625

      1-3/16

      1.1875

      3-1/4

      3.25

      5-3/4

      5.75

      1-1/4

      1.25

      3-5/16

      3.3125

      5-7/8

      5.875

      1-5/16

      1.3125

      3-3/8

      3.375

      5-15/16

      5.9375

      1-3/8

      1.375

      3-7/16

      3.4375

      6

      6.00

      1-7/16

      1.4375

      3-1/2

      3.50

       

       

      1-1/2

      1.50

      3-9/16

      3.5625

  5. Use the ‘Calculate’ button to complete your calculation, or the ‘Reset’ button to reset the plate weight calculator if you want to start over.

How to Calculate Plate Weight

Don’t feel like using our handy plate weight calculator? Here’s how to manually calculate the weight of rectangular, square, and round plates:

How to Calculate the Weight of Rectangular Plates

The first step is to work out the volume of the rectangular plate, and you can do this using the following equation:

V = L x W x T

The above calculation consists of the following elements when it comes to calculating the weight of a rectangular plate:

V = Volume

L = The length of the rectangular plate

W = The width of the rectangular plate

T = The rectangular plate’s thickness

Let’s work through an example of a mild steel rectangular plate that has a length of 400mm, a width of 50mm, and a thickness of 10mm.

Because we’re using a density of 7850 kg/m3 for the calculation, we’ll need to convert the dimensions in this example to meters. Therefore, the length will equal 0.4m, the width will equal 0.05m, and the 10mm thickness becomes 0.010 for the calculation.

Here’s how the calculation works:

Volume = 0.4 x 0.05 x 0.010
Volume = 0.0002m3

Mild Steel Density = 7850 kg/m3

If we multiply the 0.0001m3 volume figure by the 7850 kg/m3 density figure, we end up with a weight of 1.57 kg or 3.46 lbs.

How to Calculate the Weight of Square Plates

The process to calculate the weight of a square plate is very similar to the one we followed above for rectangular plates.

The main difference is that we won’t have two different values for length and width as we did with the rectangular plate example, as these will be the same given the square profile of the plate.

The equation is as follows for square plates:

V = (2 x W) x T

The above calculation consists of the following elements:

V = Volume

W = The length of one of the square plate’s sides

T = The square plate’s thickness

For this example, let’s assume we’re calculating the weight of an aluminum plate with sides that are 200mm in length and a thickness of 25mm.

As above, we’ll need to convert the dimensions to meters given that we’re working with a density of aluminum of 2712 kg/m3. So, the side measurements will become 0.2m, whereas the thickness will be 0.025 for the calculation.

Here’s how the calculation works:

Volume = (0.2 x 0.2) x 0.025
Volume = 0.001m3

Aluminum Density = 2712 kg/m3

If we multiply the 0.001m3 volume figure by the 2712 kg/m3 density figure, we end up with a weight of 2.71 kg or 5.97 lbs.

How to Calculate the Weight of Round Plates

The first step is to determine the volume of the round plate, with the equation as follows:

V = π r2 t

When calculating the weight of a round plate, the equation consists of the following elements:

V = Volume

π = Pi, or 3.142

r = The radius of the round plate, squared

t = The round plate’s thickness

Let’s work through an example of a mild steel round plate that has a diameter of 200mm and a thickness of 50mm.

In this case, we’ll be multiplying the Pi figure (3.142) by the radius squared (100mm for this example, or half the diameter value), and finally, we’ll be multiplying by the thickness of the round plate (50mm in this case).

Because we’re using a density of 7850 kg/m3 for the calculation, we’ll need to convert the dimensions in this example to meters. The 100mm radius should be 0.1 (the radius dimension converted to meters), whereas the thickness should be 0.05.

Here’s how the calculation works:

Volume = (3.142 x (0.1 x 0.1)) x 0.05
Volume = 0.001571m3

Mild Steel Density = 7850 kg/m3

If we multiply the 0.001571m3 volume figure by the 7850 kg/m3 density figure, we end up with a weight of 12.33 kg or 27.18 lbs.


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