# Tube Weight Calculator

Need to calculate the weight of metal tubing? Our handy tube weight calculator will help you calculate the weight of round, square, rectangular, or hexagonal tubes in seconds.

We’ve included a helpful user guide below the calculator if you get stuck. We’ve also written a series of guides to show you to complete the calculation manually if you’d prefer to bypass the calculator.

Tube Weight Calculator:
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Total Weight = 0.00 lbs / 0.00 kg

## How to Use the Tube Weight Calculator

1. The first step is choosing the tube type for your calculation, with round, square, rectangular, and hexagonal tubes available from the ‘Select a Tube Type’ dropdown.

2. You can change the material used for the tubing in your calculation via the ‘Material’ dropdown in box (2).

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 tubes you include in your calculation by updating the ‘Quantity’ dropdown in box (2).
4. Depending on the tube type chosen for your calculation, you’ll need to enter various dimensions, for example, ‘Length’, ‘Diameter’, ‘Width’, and ‘Thickness’.

The calculator will automatically reformat depending on the type of tube 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 tube weight calculator. Click the button below to view the table:

• Tube 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 tube bar weight calculator if you want to start over.

## How to Calculate Tube Weight

Don’t feel like using our handy tube weight calculator? No problem. We’ll show you how to calculate the weight of metal tubing in this section manually:

### How to Calculate the Weight of Round Tube

Calculating the weight of a round tube or pipe is relatively simple, and you can complete the calculation in three distinct steps.

Step One

For the first step, we’ll treat the round tube as if it’s a solid round bar by disregarding the hollow part of the pipe for now.

We can calculate the overall volume as follows:

V = π r2 l

The equation above consists of the following elements:

V = Volume

π = Pi, or 3.142

r = The radius of the round tube, squared

l = The length of the round tube

To show you how the calculation works, we’ll work through an example of a mild steel round tube with a diameter of 40mm and a length of 1-meter.

For this calculation, we’ll be multiplying the Pi figure of 3.142 by the round tube’s radius squared (the radius is half the diameter, so 20mm for this example), and finally, we’ll be multiplying this by the round tube’s length (1-meter in this case).

As we’re using a density of 7850 kg/m3 for this calculation (i.e., mild steel’s density on a per meter basis), we’ll need to convert each of the other dimensions used in the formula to meters.

We don’t need to change the length as it’s already in meters (1-meter in this case), but the 20mm radius should be 0.020 (the radius dimension converted to meters).

We can then calculate the volume of the round tube as if it was a solid bar as follows:

Overall Round Tube Volume = (3.142 x (0.020 x 0.020)) x 1
Overall Round Tube Volume = 0.00126m3

Step Two

Next, we need to calculate the volume of the hollow section of the round tube, and we’ll use the same equation from step one above to do so.

For this example, we’ll assume that the 40mm round tube has a thickness of 8mm, meaning the hollow section of the round tube has a diameter of 24mm (40mm minus the sides which measure 8mm each in thickness).

As above, we’ll need to convert the dimensions to meters to suit the 7850 kg/m3 density we’re using for mild steel in the calculation. So, we’ll use a figure of 0.012 for the radius of the hollow section (the radius is half of the diameter, remember).

Here’s how the second part of the calculation works:

Hollow Section Volume = (3.142 x (0.012 x 0.012)) x 1
Hollow Section Volume = 0.00045m3

Step Three

Finally, we need to subtract the volume of the hollow section of the round tube from the tube’s overall volume.

For example:

Total Volume = Overall Round Tube Volume – Hollow Section Volume
Total Volume = 0.00081m3

If we multiply the 0.00081m3 volume figure by the 7850 kg/m3 density figure for mild steel, we end up with a weight of 6.36 kg or 14.02 lbs for the round tube.

### How to Calculate the Weight of Square Tube

As with the round tube weight calculation above, calculating the weight of square tube is a three-step process.

Step One

The first step is to disregard the hollow portion of the square tube altogether and to calculate the overall volume of the tube as if it was a solid square bar.

We can calculate the overall volume as follows:

V = w2 l

The equation above consists of the following elements:

V = Volume

w = The width of the square tube, squared

l = The length of the square tube

To show you how the calculation works, we’ll work through an example of a stainless steel square tube with a width of 50mm and a length of 1-meter.

For this calculation, we’ll be squaring the width of the square tube to find the cross-sectional area (50mm x 50mm in this case, or 2500mm2, and multiplying this figure by the square tube’s length (1-meter in this case).

As we’re using a density of 7930 kg/m3 for this calculation (i.e., type 304 stainless steel’s density on a per meter basis), we’ll need to convert each of the other dimensions used in the formula to meters.

We don’t need to change the length as it’s already in meters (1-meter in this case), but the 50mm width should be 0.050 (the width dimension converted to meters).

We can then calculate the volume of the square tube as if it was a solid square bar as follows:

Overall Square Tube Volume = (0.050 x 0.050) x 1
Overall Square Tube Volume = 0.0025m3

Step Two

Next, we need to calculate the volume of the hollow section of the square tube, and we’ll use the same equation from step one above to do so.

For this example, we’ll assume that the 50mm square tube has a thickness of 10mm, meaning the hollow section of the square tube has a width of 30mm (50mm minus the sides which measure 10mm each in thickness).

As above, we’ll need to convert the dimensions to meters to suit the 7930 kg/m3 density we’re using for stainless steel in the calculation. So, we’ll use a figure of 0.030 for the width of the hollow section.

We complete the second part of the calculation as follows:

Hollow Section Volume = (0.030 x 0.030) x 1
Hollow Section Volume = 0.0009m3

Step Three

The final step is to subtract the volume of the hollow section of the square tube from the tube’s overall volume.

In the case of our example:

Total Volume = Overall Square Tube Volume – Hollow Section Volume
Total Volume = 0.0016m3

If we multiply the 0.0016m3 volume figure by the 7930 kg/m3 density figure for type 304 stainless steel, we end up with a weight of 12.69 kg or 27.97 lbs for the square tube.

### How to Calculate the Weight of Rectangular Tube

Calculating the weight of rectangular tubing is similar to that of a square tube. However, while a square has a width and height of the same size, you’ll need to take account of the increase in one of these dimensions when working with a rectangle.

As with the square tube’s calculation, you’ll first need to disregard the rectangular tube’s hollow portion and calculate the overall volume as if the tubing is solid.

The calculation for this is as follows:

V = w h l

The equation above consists of the following elements:

V = Volume

w = The width of the rectangular tube

h = The height of the rectangular tube

l = The length of the square tube

Next, you’ll need to calculate the volume of the hollow portion of the rectangular tube, and you can do this by repeating the formula above with the relevant dimensions for the hollow section.

Finally, you’ll need to subtract the volume of the hollow section from the overall volume of the rectangular tube before multiplying this figure by the density of whichever material you’re using.

### How to Calculate the Weight of Hexagonal Tube

As with the other tube profiles in this section, we can calculate the weight of hexagonal tubing in three distinct steps.

Step One

The first step is to determine the overall volume of the hexagonal tube as if it were not hollow, with the equation as follows:

V = (((√3/2) x AFW2) x L)

When calculating the weight of hex bar tube, the equation consists of the following elements:

V = Volume

AFW = The ‘across flats’ width of the hex bar

L = The length of the hex bar

Let’s work through an example of a type 304 stainless steel hex tube that has an ‘across flats’ width of 40mm and a length of 2-meters.

In this case, we’ll be dividing the square root of 3 (approximately 1.73) by two before multiplying this figure by the across-flats width (40mm) squared, before finally multiplying this figure by the length of the steel hex tube (2 meters).

Because we’re using a density of 7930 kg/m3 for the calculation, we’ll need to convert the dimensions in this example to meters. The length of the bar is already 2-meters, so we don’t need to change this, but the 40mm width should be 0.04 (the width dimension converted to meters).

Here’s how the calculation works:

Overall Hex Tube Volume = (((1.73÷2)×(0.04×0.04)×2))
Overall Hex Tube Volume = 0.002768m3

Step Two

The next step is to calculate the volume of the hollow section of the hexagonal tube, and we can use the same equation that we used in step one.

For this example, we’ll assume that the 40mm hexagonal tube has a thickness of 8mm, meaning the hollow section of the square tube has a width of 24mm (40mm minus the two sides which measure 8mm each in thickness).

As above, we’ll need to convert the dimensions to meters to suit the 7930 kg/m3 density we’re using for stainless steel in the calculation. So, we’ll use a figure of 0.024 for the width of the hollow section.

Here’s a workthrough of the second part of the calculation:

Hollow Section Volume = (((1.73÷2)×(0.024×0.024)×2))
Hollow Section Volume = 0.00099648m3

Step Three

Finally, we need to subtract the volume of the hollow section of the hex tube (the answer from step two) from the tube’s overall volume (the answer from step one).

Here’s what we end up with:

Total Volume = Overall Hex Tube Volume – Hollow Section Volume
Total Volume = 0.00177152m3

If we multiply the 0.00177152m3 volume figure by the 7930 kg/m3 density figure for type 304 stainless steel, we end up with a weight of 14.05 kg or 30.97 lbs for the hexagonal tube.