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.
How to Use the Plate Weight Calculator

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.

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.
 You can change how many plates you include in your calculation by updating the ‘Quantity’ dropdown in box (2).

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.
!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
19/16
1.5625
35/8
3.625
5/32
0.15625
15/8
1.625
311/16
3.6875
3/16
0.1875
111/16
1.6875
33/4
3.75
7/32
0.21875
13/4
1.75
313/16
3.8125
1/4
0.25
113/16
1.8125
37/8
3.875
9/32
0.28125
17/8
1.875
315/16
3.9375
5/16
0.1325
115/16
1.9375
4
4.00
11/32
0.34375
2
2.00
41/8
4.125
3/8
0.375
21/16
2.0625
43/16
4.1875
13/32
0.40625
21/8
2.125
41/4
4.25
7/16
0.4375
23/16
2.1875
45/16
4.3125
15/16
0.9375
21/4
2.25
43/8
4.375
1/2
0.5
25/16
2.3125
47/16
4.4375
17/32
0.53125
23/8
2.375
41/2
4.50
9/16
0.5625
27/16
2.4375
49/16
4.5625
19/32
0.59375
21/2
2.50
45/8
4.625
5/8
0.625
29/16
2.5625
411/16
4.6875
11/16
0.6875
25/8
2.625
5
5.00
3/4
0.75
211/16
2.6875
51/16
5.0625
13/16
0.8125
23/4
2.75
51/8
5.125
7/8
0.875
27/8
2.875
53/16
5.1875
13/16
0.8125
215/16
2.9375
51/4
5.25
15/16
0.9375
3
3.00
53/8
5.375
1
1.00
31/16
3.0625
57/16
5.4375
11/16
1.0625
31/8
3.125
51/2
5.50
11/8
1.125
33/16
3.1875
55/8
5.625
13/16
1.1875
31/4
3.25
53/4
5.75
11/4
1.25
35/16
3.3125
57/8
5.875
15/16
1.3125
33/8
3.375
515/16
5.9375
13/8
1.375
37/16
3.4375
6
6.00
17/16
1.4375
31/2
3.50
11/2
1.50
39/16
3.5625

 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:
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/m^{3} 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 = 0.0002m^{3}
Mild Steel Density = 7850 kg/m^{3}
If we multiply the 0.0001m^{3} volume figure by the 7850 kg/m^{3} 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:
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/m^{3}. 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 = 0.001m^{3}
Aluminum Density = 2712 kg/m^{3}
If we multiply the 0.001m^{3} volume figure by the 2712 kg/m^{3} 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:
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/m^{3} 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 = 0.001571m^{3}
Mild Steel Density = 7850 kg/m^{3}
If we multiply the 0.001571m^{3} volume figure by the 7850 kg/m^{3} density figure, we end up with a weight of 12.33 kg or 27.18 lbs.
Other Helpful Weight Calculators
Calculators by Section Type:
Calculators by Material: