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Structural · W — wide-flange

W21x122 Steel Beam — Dimensions & Properties

W21x122 weighs 122 lb/ft and is about 21.68 in deep. Below: the full AISC section properties, a scaled cross-section, and a pre-filled weight calculator.

Weight
122lb/ft
Depth
21.68in
Width
12.39in
Area
35.9in²
Shape
W21X122 · W — wide-flange

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 × W21X122
2,440lb
Per piece
2440lb
Pieces
1
Total
2440lb
Tons
1.22t
d21.68"bf 12.39"tw 0.6
ƒShow the math
  1. 1.Weight per foot (from AISC)per AISC Shapes Database v16.0

    W21X122 is a listed shape; its nominal weight is a published property.

    = 122 lb/ft
  2. 2.Length in feet
    length (in) ÷ 12
    240 ÷ 12
    = 20 ft
  3. 3.Weight per piece
    weight per foot × length
    122 × 20
    = 2440 lb
  4. 4.Total weight
    weight per piece × quantity
    2440 × 1
    = 2440 lb
  5. 5.Convert to tons
    total lb ÷ 2000
    2440 ÷ 2000
    = 1.22 tons

Section properties

Geometry
Weight
122lb/ft
Area, A
35.9in²
Depth, d
21.68in
Flange width, bf
12.39in
Flange thick, tf
0.96in
Web thick, tw
0.6in
Strong axis (x-x)
Ix
2,960in⁴
Sx
273in³
Zx
307in³
rx
9.09in
Weak axis (y-y)
Iy
305in⁴
Sy
49.2in³
Zy
75.6in³
ry
2.92in
Torsion & warping
J
8.98in⁴
Cw
32,700in⁶
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.

W21x44 44 lb/ftW21x50 50 lb/ftW21x57 57 lb/ftW21x62 62 lb/ftW21x68 68 lb/ftW21x83 83 lb/ftW21x93 93 lb/ftW21x101 101 lb/ftW24x55 55 lb/ftW24x68 68 lb/ft

W21x122 — questions

How much does a W21x122 weigh per foot?
A W21x122 weighs 122 lb/ft. Over a 20-foot length that is 2,440 lb (1.22 tons); a 30-foot length is 3,660 lb.
What are the dimensions of a W21x122?
W21x122 has an actual depth of 21.68 in and a flange width of 12.39 in, a flange thickness of 0.96 in, and a web thickness of 0.6 in. Cross-sectional area is 35.9 in².
What is the moment of inertia and section modulus of a W21x122?
About its strong axis, W21x122 has a moment of inertia Ix of 2,960 in⁴ and a section modulus Sx of 273 in³, with a plastic section modulus Zx of 307 in³. Use these with your engineer's design values — they are geometric properties, not an allowable load.
What does W21x122 mean?
The W means wide-flange. The first number is the nominal depth in inches and the second is the weight in pounds per foot — so W21x122 is a nominally 21-inch-deep wide-flange beam weighing 122 lb/ft (actual depth 21.68 in).

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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.