Steel C Channel Sizes Chart (C3–C15) – Dimensions & Weight per Foot

Looking for a steel C channel sizes chart with dimensions and weight? This guide provides standard C channel sizes, detailed C channel dimensions, and C channel weight per foot (lb/ft) for C3 through C15 sections, with metric conversions in mm and kg/m for engineering, fabrication, and steel purchasing reference.

Steel C Channel Sizes Chart: C3–C15

The following steel C channel sizes chart provides a quick reference for standard C channel sections, including depth, flange width, web thickness, and weight in both imperial and metric units. The table combines C channel sizes, dimensions, and weight so engineers, fabricators, and buyers can compare sections without switching between separate charts.

Designation	in				mm
	Depth (in)	Flange Width (in)	Web Thickness (in)	Weight (lb/ft)	Depth (mm)	Flange Width (mm)	Web Thickness (mm)	Weight (kg/m)
C3 × 4.1	3	1.41	0.17	4.1	76.2	35.8	4.3	6.1
C4 × 5.4	4	1.58	0.18	5.4	101.6	40.1	4.6	8
C5 × 6.7	5	1.75	0.19	6.7	127	44.5	4.8	10
C6 × 8.2	6	1.92	0.2	8.2	152.4	48.8	5.1	12.2
C7 × 9.8	7	2.09	0.21	9.8	177.8	53.1	5.3	14.6
C8 × 11.5	8	2.26	0.22	11.5	203.2	57.4	5.6	17.1
C9 × 13.4	9	2.43	0.23	13.4	228.6	61.7	5.8	19.9
C10 × 15.3	10	2.6	0.24	15.3	254	66	6.1	22.8
C12 × 20.7	12	2.94	0.28	20.7	304.8	74.7	7.1	30.8
C15 × 33.9	15	3.4	0.4	33.9	381	86.4	10.2	50.4

These standard C channel sizes cover sections from C3 to C15, with depths from 3 to 15 inches. The designation combines the nominal channel depth with the section weight in pounds per foot.

For example, C8 × 11.5 indicates an approximately 8-inch-deep channel with a weight of 11.5 lb/ft.

For structural and fabrication requirements, you can also view our Steel C Channel product information for available supply options.

C Channel Dimensions in Inches and mm

C channel dimensions are commonly specified using depth, flange width, and web thickness. For international projects, the same dimensions can be referenced in millimeters.

The chart above provides both inch and metric values for direct comparison:

• Depth (d): the overall vertical depth of the C channel.
• Flange width (bf): the horizontal width of the flange.
• Web thickness (tw): the thickness of the channel web.
• Weight: expressed as lb/ft in the imperial system and kg/m in the metric system.

For example:

• C6 × 8.2: 6 in depth, 1.92 in flange width, 0.20 in web thickness, and 8.2 lb/ft.
• C12 × 20.7: 12 in depth, 2.94 in flange width, 0.28 in web thickness, and 20.7 lb/ft.

These dimensions help users compare C channel sizes in inches and mm when selecting sections for structural and fabrication applications.

C Channel Sizes in Metric: mm and kg/m

While standard C channel sizes are typically defined in inches, many international projects require c channel sizes in metric units (mm and kg/m).

The table above already includes both imperial (inch, lb/ft) and metric (mm, kg/m) units, allowing direct comparison between measurement systems. This makes the chart useful for comparing C channel sizes in mm, C channel weight per meter, and imperial designations within the same reference.

C Channel Weight per Foot and kg/m

The weight of a C channel is an important specification for material estimation, structural selection, transportation, and fabrication.

The listed C channel weight per foot ranges from:

• C3 × 4.1: 4.1 lb/ft
• C4 × 5.4: 5.4 lb/ft
• C5 × 6.7: 6.7 lb/ft
• C6 × 8.2: 8.2 lb/ft
• C8 × 11.5: 11.5 lb/ft
• C10 × 15.3: 15.3 lb/ft
• C12 × 20.7: 20.7 lb/ft
• C15 × 33.9: 33.9 lb/ft

The corresponding metric values are shown in the main chart in kg/m.

For example, C8 × 11.5 weighs 11.5 lb/ft, while C15 × 33.9 weighs 33.9 lb/ft. The heavier sections generally provide greater cross-sectional area and are used where higher structural capacity is required.

Structural Properties

In addition to C channel dimensions and weight, structural design may require section properties such as cross-sectional area, moment of inertia, and section modulus.

Designation	Area (in²)	Ix (in⁴)	Sx (in³)
C3 × 4.1	1.21	1.77	1.18
C4 × 5.4	1.59	4.47	2.23
C5 × 6.7	1.97	8.72	3.49
C6 × 8.2	2.41	15.4	5.14
C7 × 9.8	2.88	25.1	7.18
C8 × 11.5	3.38	38.5	9.62
C9 × 13.4	3.94	56.5	12.6
C10 × 15.3	4.49	79.1	15.8
C12 × 20.7	6.08	147	24.5
C15 × 33.9	9.97	370	49.3

Explanation of engineering parameters:

• Area (A) – cross-sectional area of the channel
• Ix – moment of inertia about the strong axis
• Sx – section modulus used in bending calculations

These values are commonly referenced in structural design and load calculations.

Most Common Steel C Channel Sizes and Applications

Different c channel sizes are used depending on load and application requirements

1. Small Channels (C3–C5)

• Light framing
• Equipment brackets
• Machinery bases
• Small support frames

2. Medium Channels (C6–C8)

• Structural frames
• Roof supports
• Trailer frames
• Equipment structures

3. Large Channels (C10–C15)

• Building frameworks
• Industrial platforms
• Heavy machinery supports
• Structural reinforcement

These common c channel sizes cover most structural and fabrication applications.

How to Choose the Right Steel C Channel Size

Selecting the correct C channel size depends on several practical factors.

• Load requirements – Higher loads require heavier sections
• Span length – Longer spans need deeper channels
• Structural role – Support beams, frames, or reinforcements

Using accurate c channel weight per foot helps estimate material quantities and project costs.

Need custom C channel sizes or bulk supply? Contact us for mill prices and international shipping.

Steel C Channel Size FAQ

• What are standard steel C channel sizes?
  Standard steel c channel sizes typically range from C3 to C15, corresponding to depths from 3 inches to 15 inches.
• How do you read C channel sizes like C8 × 11.5?
  C8 × 11.5 indicates an approximately 8-inch channel depth and a section weight of 11.5 lb/ft.
• What is the weight of C channel per foot?
  The listed C channel weights range from 4.1 lb/ft for C3 × 4.1 to 33.9 lb/ft for C15 × 33.9.
• What are C channel dimensions in inches?
  In the U.S., c channel dimensions in inches include depth, flange width, and web thickness, with weight measured in lb/ft.
• What are C channel sizes in metric units?
  C channel sizes can be referenced in millimeters (mm) for dimensions and kilograms per meter (kg/m) for weight. The main chart provides metric conversions for the listed C3–C15 sections.
• What is the difference between C channel and U channel?
  C channel and U channel differ in their profile geometry and typical applications. For a detailed comparison of sizes, strength, and uses, see our C Channel vs U Channel Steel guide.