W18X311 Dimensions & Weight
W18X311 is an AISC wide-flange (W) shape with an actual depth of 22.32 in and a 12.01 in wide flange, weighing 311 lb per foot — a size you will see on longer floor spans and transfer framing. It is the heaviest of the 23 W18 sizes listed here.
W18X311 Dimensions
| Property | Imperial | Metric |
|---|---|---|
| Depth (d) | 22.32 in | 566.9 mm |
| Flange width (bf) | 12.01 in | 304.9 mm |
| Cross-section area (A) | 91.4 in² | 589.7 cm² |
| Weight | 311 lb/ft | 462.8 kg/m |
What does W18X311 cost?
At an example material price of $0.92/lb, W18X311 runs about $286 per foot, or roughly $5,722 for a 20-ft length.
Example pricing only. Actual steel pricing varies by region, grade, quantity, and market conditions — use your own supplier numbers for real bids.
Counting W18X311s off a drawing set by hand? SteelFlo finds every steel label on your PDF automatically — 3 takeoffs free.
Related sizes
Deeper reading: Wide-Flange Beam Sizes: The Complete Guide · How to calculate steel weight