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Round Bar Weight Calculator


From aluminum to stainless steel, our handy calculator makes it quick and easy to calculate the weight of round bar stock.

For technical guidance, please refer to the user guide below the calculator. We’ve also included a series of helpful reference tables below that display additional round bar weight information, for example, on a per foot or meter basis.

Calculate Round Bar Weight:
toolcrowd round bar weight calculator example image
Total Weight = 0.00 lbs / 0.00 kg

How to Use the Round Bar Weight Calculator

  1. Use the ‘Round Bar Material’ box to choose a material.

    The ‘Density’ box will automatically be populated based on your material choice (unless you choose ‘Other’, with this option allowing you to use the calculator with other round bar materials not already included).

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

    !

    Note: If you choose ‘Other’ as a material, you’ll need to insert a density (on a kg/m3 basis) for the calculator to function.

  2. Use the ‘Number of Bars’ box to specify how many round bar units to include in the calculation.
  3. Use the ‘Round Bar Length’ and ‘Round Bar Diameter’ boxes to specify the size of round bar to include in the specification.

    You can select the relevant units for each measurement using the ‘Unit’ dropdowns.

    !

    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.

    Click the button below to view a table of common round bar inch thicknesses as decimals that you can use in the calculator:


    • Round Bar Diameter – 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

  4. Use the ‘Calculate’ button to complete the calculation, and the ‘Reset’ button to reset the round bar weight calculator.

How to Calculate the Weight of Round Bar

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

V = π r2 l

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

V = Volume

π = Pi, or 3.142

r = The radius of the round bar, squared

l = The length of the round bar

Let’s work through an example of a stainless steel (type 304) round bar that has a diameter of 50mm and a length of 1-meter.

In this case, we’ll be multiplying the Pi figure (3.142) by the radius squared (25mm for this example, or half the diameter value), and finally, we’ll be multiplying the length of the steel round bar (1m).

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 1-meter, so we don’t need to change this, but the 25mm radius should be 0.025 (the radius dimension converted to meters).

Here’s how the calculation works:

Volume = (3.142 x (0.025 x 0.025)) x 1
Volume = 0.00196m3

Stainless Steel Type 304 Density = 7930 kg/m3

If we multiply the 0.00196m3 volume figure by the 7930 kg/m3 density figure, we end up with a weight of 15.54 kg or 34.26 lbs.


Round Bar Reference Weight Tables

Steel Round Bar – Reference Weight Table (Imperial)

For those in the United States, or for anyone who prefers working with imperial sizing, here’s a summary of the approximate weight of both stainless and mild steel round bar across a variety of imperial diameters:

[Scroll table if necessary].

Steel Round Bar – Imperial Weight Table

Round Bar Diameter (inches)

Stainless Steel Round Bar
(Type 304)

Mild Steel Round Bar

Approximate Weight per Foot

Approximate Weight per 20′ Bar

Approximate Weight per Foot

Approximate Weight per 20′ Bar

1/8″

0.04 lbs

0.84 lbs

0.04 lbs

0.83 lbs

1/4″

0.17 lbs

3.37 lbs

0.17 lbs

3.34 lbs

1/2″

0.67 lbs

13.48 lbs

0.67 lbs

13.34 lbs

3/4″

1.52 lbs

30.33 lbs

1.50 lbs

30.02 lbs

1″

2.70 lbs

53.92 lbs

2.67 lbs

53.38 lbs

1-1/8″

3.41 lbs

68.24 lbs

3.38 lbs

67.55 lbs

1-1/4″

4.21 lbs

84.25 lbs

4.17 lbs

83.40 lbs

1-1/2″

6.07 lbs

121.32 lbs

6.00 lbs

120.10 lbs

1-3/4″

8.26 lbs

165.13 lbs

8.17 lbs

163.47 lbs

2″

10.78 lbs

215.68 lbs

10.68 lbs

213.51 lbs

2-1/8″

12.17 lbs

243.48 lbs

12.05 lbs

241.03 lbs

2-1/4″

13.65 lbs

272.97 lbs

13.51 lbs

270.22 lbs

2-1/2″

16.85 lbs

337 lbs

16.68 lbs

333.60 lbs

2-3/4″

20.39 lbs

407.77 lbs

20.18 lbs

403.66 lbs

3″

24.26 lbs

485.28 lbs

24.02 lbs

480.39 lbs

3-1/8″

26.33 lbs

526.57 lbs

26.06 lbs

521.25 lbs

3-1/4″

28.48 lbs

569.53 lbs

28.19 lbs

563.79 lbs

3-1/2″

33.03 lbs

660.52 lbs

32.69 lbs

653.86 lbs

3-3/4″

37.91 lbs

758.25 lbs

37.53 lbs

750.61 lbs

4″

43.14 lbs

862.73 lbs

42.70 lbs

854.02 lbs

4-1/8″

45.87 lbs

917.49 lbs

45.41 lbs

908.23 lbs

4-1/4″

48.70 lbs

973.94 lbs

48.21 lbs

964.11 lbs

4-1/2″

54.59 lbs

1091.89 lbs

54.04 lbs

1080.87 lbs

4-3/4″

60.83 lbs

1216.58 lbs

60.22 lbs

1204.30 lbs

5″

67.40 lbs

1348.01 lbs

66.72 lbs

1334.41 lbs

5-1/8″

70.81 lbs

1416.25 lbs

70.10 lbs

1401.96 lbs

5-1/4″

74.31 lbs

1486.18 lbs

73.56 lbs

1471.19 lbs

5-1/2″

81.55 lbs

1631.09 lbs

80.73 lbs

1614.63 lbs

5-3/4″

89.14 lbs

1782.74 lbs

88.24 lbs

1764.76 lbs

6″

97.06 lbs

1941.13 lbs

96.08 lbs

1921.55 lbs

Steel Round Bar – Reference Weight Table (Metric)

For those residing outside of the United States, or for anyone who prefers working with metric sizing, here’s a summary of the approximate weight of both stainless and mild steel round bar across a variety of metric diameters:

[Scroll table if necessary].

Steel Round Bar – Metric Weight Table

Round Bar Diameter (mm)

Stainless Steel Round Bar
(Type 304)

Mild Steel Round Bar

Approximate Weight per Meter

Approximate Weight per 3m Bar

Approximate Weight per Meter

Approximate Weight per 3m Bar

3mm

0.06 kg

0.17 kg

0.06 kg

0.17 kg

4mm

0.10 kg

0.30 kg

0.10 kg

0.30 kg

5mm

0.16 kg

0.47 kg

0.15 kg

0.46 kg

6mm

0.22 kg

0.67 kg

0.22 kg

0.67 kg

7mm

0.31 kg

0.92 kg

0.30 kg

0.91 kg

8mm

0.40 kg

1.20 kg

0.39 kg

1.18 kg

10mm

0.62 kg

1.87 kg

0.62 kg

1.85 kg

12mm

0.90 kg

2.69 kg

0.89 kg

2.66 kg

14mm

1.22 kg

3.66 kg

1.21 kg

3.63 kg

15mm

1.40 kg

4.20 kg

1.39 kg

4.16 kg

16mm

1.59 kg

4.78 kg

1.58 kg

4.74 kg

18mm

2.02 kg

6.05 kg

2.00 kg

5.99 kg

20mm

2.49 kg

7.47 kg

2.47 kg

7.40 kg

22mm

3.01 kg

9.04 kg

2.98 kg

8.95 kg

24mm

3.59 kg

10.76 kg

3.55 kg

10.66 kg

25mm

3.89 kg

11.68 kg

3.85 kg

11.56 kg

28mm

4.88 kg

14.65 kg

4.83 kg

14.50 kg

30mm

5.61 kg

16.82 kg

5.55 kg

16.65 kg

32mm

6.38 kg

19.14 kg

6.31 kg

18.94 kg

34mm

7.20 kg

21.60 kg

7.13 kg

21.38 kg

36mm

8.07 kg

24.22 kg

7.99 kg

23.97 kg

40mm

9.97 kg

29.90 kg

9.87 kg

29.60 kg

45mm

12.61 kg

37.84 kg

12.49 kg

37.46 kg

50mm

15.57 kg

46.72 kg

15.42 kg

46.25 kg

56mm

19.53 kg

58.60 kg

19.34 kg

58.01 kg

60mm

22.42 kg

67.27 kg

22.20 kg

66.59 kg

63mm

24.72 kg

74.17 kg

24.47 kg

73.42 kg

63.5mm

25.12 kg

75.35 kg

24.86 kg

74.59 kg

65mm

26.32 kg

78.95 kg

26.05 kg

78.16 kg

70mm

30.52 kg

91.57 kg

30.21 kg

90.64 kg

73mm

33.19 kg

99.58 kg

32.86 kg

98.58 kg

75mm

35.04 kg

105.11 kg

34.68 kg

104.05 kg

78mm

37.90 kg

113.69 kg

37.52 kg

112.55 kg

80mm

39.87 kg

119.60 kg

39.46 kg

118.39 kg

83mm

42.91 kg

128.74 kg

42.48 kg

127.44 kg

85mm

45.00 kg

135.01 kg

44.55 kg

133.65 kg

90mm

50.46 kg

151.37 kg

49.95 kg

149.84 kg

92mm

52.72 kg

158.17 kg

52.19 kg

156.57 kg

93mm

53.87 kg

161.62 kg

53.33 kg

159.99 kg

95mm

56.22 kg

168.65 kg

55.65 kg

166.95 kg

100mm

62.29 kg

186.87 kg

61.66 kg

184.99 kg

105mm

68.67 kg

206.02 kg

67.98 kg

203.95 kg

110mm

75.37 kg

226.11 kg

74.61 kg

223.83 kg

115mm

82.38 kg

247.14 kg

81.55 kg

244.64 kg

125mm

97.33 kg

291.99 kg

96.35 kg

289.04 kg


Quick Reference Information

MS Round Bar Weight

Mild steel round bar has a typical density of 7850 kg/m3 (490 lbs/ft3).

In 20-foot lengths, mild steel round bar weighs 13.34 lbs at 1/2″ or 53.38 lbs at 1″ diameter.

In metric sizes, a 12mm diameter, 3-meter mild steel round bar weighs 2.66 kg, while a 25mm diameter bar of the same length weighs 11.56 kg.

SS Round Bar Weight

Type 304 stainless-steel round bar has a typical density of 7930 kg/m3 (495 lbs/ft3).

A 20-foot, 1/2″ diameter stainless steel round bar weighs 13.48 lbs, or 53.92 lbs at 1″ diameter.

In metric sizes, a 12mm diameter, 3-meter stainless steel round bar weighs 2.69 kg, while a 25mm diameter bar weighs 11.68 kg.

Aluminum Round Bar Weight

6061 aluminum round bar has a typical density of 2700 kg/m3 (168.56 lbs/ft3).

A 20-foot, 1/2″ diameter 6061 aluminum round bar weighs 4.59 lbs, or 18.36 lbs at 1″ diameter.

In metric sizes, a 12mm diameter, 3-meter 6061 aluminum round bar weighs 0.92 kg, while a 25mm diameter bar weighs 3.98 kg.

Brass Round Bar Weight

Brass round bar has a typical density of 8525 kg/m3 (532.20 lbs/ft3).

A 20-foot, 1/2″ diameter brass round bar weighs 14.49 lbs, or 57.97 lbs at 1″ diameter.

In metric sizes, a 12mm diameter, 3-meter brass round bar weighs 2.89 kg, while a 25mm diameter bar weighs 12.56 kg.

Titanium Round Bar Weight

Titanium round bar has a typical density of 4506 kg/m3 (281.30 lbs/ft3).

A 20-foot, 1/2″ diameter titanium round bar weighs 7.66 lbs, or 30.64 lbs at 1″ diameter.

In metric sizes, a 12mm diameter, 3-meter titanium round bar weighs 1.53 kg, while a 25mm diameter bar weighs 6.64 kg.


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