Skip to content
crewcalcs
Structural · C — channel

C8x18.75 Steel Channel — Dimensions & Properties

C8x18.75 weighs 18.75 lb/ft and is about 8 in deep. Below: the full AISC section properties, a scaled cross-section, and a pre-filled weight calculator.

Weight
18.75lb/ft
Depth
8in
Width
2.527in
Area
5.51in²
Shape
C8X18.75 · C — channel

Enter feet + inches, e.g. 20' or 18' 6".

= 20' (240″)
pcs
Cost estimate (optional)
$/lb

Optional. Prices are volatile — use your current mill/supplier rate.

Total weight
1 × C8X18.75
375lb
Per piece
375lb
Pieces
1
Total
375lb
Tons
0.188t
bf 2.527"d 8"
ƒShow the math
  1. 1.Weight per foot (from AISC)per AISC Shapes Database v16.0

    C8X18.75 is a listed shape; its nominal weight is a published property.

    = 18.75 lb/ft
  2. 2.Length in feet
    length (in) ÷ 12
    240 ÷ 12
    = 20 ft
  3. 3.Weight per piece
    weight per foot × length
    18.75 × 20
    = 375 lb
  4. 4.Total weight
    weight per piece × quantity
    375 × 1
    = 375 lb
  5. 5.Convert to tons
    total lb ÷ 2000
    375 ÷ 2000
    = 0.188 tons

Section properties

Geometry
Weight
18.75lb/ft
Area, A
5.51in²
Depth, d
8in
Flange width, bf
2.527in
Flange thick, tf
0.39in
Web thick, tw
0.487in
Strong axis (x-x)
Ix
43.9in⁴
Sx
11in³
Zx
13.9in³
rx
2.82in
Weak axis (y-y)
Iy
1.97in⁴
Sy
1.01in³
Zy
1.84in³
ry
0.598in
Torsion & warping
J
0.434in⁴
Before you rely on this
  • Listed weight is the AISC theoretical (nominal) weight per foot. Actual mill weight varies within ASTM rolling tolerance, roughly ±2.5%.
  • This is bare member steel only. Add plates, stiffeners, connections, bolts, and coatings for a full erected-steel takeoff.

Similar shapes

Same series and nearest depths — compare weight and section modulus when you are sizing.

C8x11.5 11.5 lb/ftC6x8.2 8.2 lb/ftC6x13 13 lb/ftC10x15.3 15.3 lb/ftC10x20 20 lb/ftC5x6.7 6.7 lb/ftC4x5.4 5.4 lb/ft

C8x18.75 — questions

How much does a C8x18.75 weigh per foot?
A C8x18.75 weighs 18.75 lb/ft. Over a 20-foot length that is 375 lb (0.188 tons); a 30-foot length is 563 lb.
What are the dimensions of a C8x18.75?
C8x18.75 has an actual depth of 8 in and a flange width of 2.527 in, a flange thickness of 0.39 in, and a web thickness of 0.487 in. Cross-sectional area is 5.51 in².
What is the moment of inertia and section modulus of a C8x18.75?
About its strong axis, C8x18.75 has a moment of inertia Ix of 43.9 in⁴ and a section modulus Sx of 11 in³, with a plastic section modulus Zx of 13.9 in³. Use these with your engineer's design values — they are geometric properties, not an allowable load.

Related tools

Structural
Steel Beam Weight Calculator

Weigh any shape and length, with tons and cost.

Structural
Historic Steel Beam Identifier

Match a measured beam to a shape by weighted distance.

Sources & references

Estimates for planning purposes only. Verify all results against the code edition adopted in your jurisdiction and with your Authority Having Jurisdiction (AHJ). This tool is not a substitute for a licensed professional engineer. See our methodology, sources, and code editions.

Data: AISC Shapes Database v16.0, © AISC — used per its developer-use provision.