W12X40 Dimensions & Weight
W12X40 is an AISC wide-flange (W) shape with an actual depth of 11.94 in and a 8.01 in wide flange, weighing 40 lb per foot — a common size for light floor framing, mezzanines, and residential beams.
W12X40 Dimensions
| Property | Imperial | Metric |
|---|---|---|
| Depth (d) | 11.94 in | 303.3 mm |
| Flange width (bf) | 8.01 in | 203.3 mm |
| Cross-section area (A) | 11.8 in² | 76.1 cm² |
| Weight | 40 lb/ft | 59.5 kg/m |
What does W12X40 cost?
At an example material price of $0.92/lb, W12X40 runs about $36.80 per foot, or roughly $736 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 W12X40s 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