W18x65 is a wide flange steel beam that is 18.4 in deep with a 7.59 in flange and weighs 65 lb/ft (97 kg/m). Its metric designation is W460x97. All values below come from the AISC Shapes Database v16.0.
W18x65 Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 65 lb/ft | 97 kg/m |
| Cross-sectional area | A | 19.1 in² | 12,300 mm² |
| Depth | d | 18.4 in | 467 mm |
| Flange width | bf | 7.59 in | 193 mm |
| Web thickness | tw | 0.45 in | 11.4 mm |
| Flange thickness | tf | 0.75 in | 19.1 mm |
| Distance to web toe of fillet (design) | kdes | 1.15 in | 29.2 mm |
| Distance to web toe of fillet (detailing) | kdet | 1.4375 in | 36.5 mm |
| Web center line to flange toe of fillet | k1 | 0.875 in | 22.2 mm |
| Distance between web toes of fillets | T | 15.5 in | 394 mm |
| Workable gage (inner holes) | WGi | 3.5 in | 88.9 mm |
W18x65 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 1,070 in⁴ | 445 ×10⁶ mm⁴ |
| Elastic section modulus, x-axis | Sx | 117 in³ | 1,920 ×10³ mm³ |
| Plastic section modulus, x-axis | Zx | 133 in³ | 2,180 ×10³ mm³ |
| Radius of gyration, x-axis | rx | 7.49 in | 190 mm |
| Moment of inertia, y-axis | Iy | 54.8 in⁴ | 22.8 ×10⁶ mm⁴ |
| Elastic section modulus, y-axis | Sy | 14.4 in³ | 236 ×10³ mm³ |
| Plastic section modulus, y-axis | Zy | 22.5 in³ | 369 ×10³ mm³ |
| Radius of gyration, y-axis | ry | 1.69 in | 42.9 mm |
| Torsional constant | J | 2.73 in⁴ | 1,140 ×10³ mm⁴ |
| Warping constant | Cw | 4,240 in⁶ | 1,140 ×10⁹ mm⁶ |
| Effective radius of gyration | rts | 2.03 in | 51.6 mm |
| Distance between flange centroids | ho | 17.7 in | 450 mm |
| Flange slenderness | bf/2tf | 5.06 | 5.06 |
| Web slenderness | h/tw | 35.7 | 35.7 |
W18x65 Weight Calculator
Enter a length to get the total weight of a W18x65 beam. A 20 ft length weighs 1,300 lb.
Uses the AISC nominal weight: 65 lb/ft (97 kg/m).
Beams Similar to W18x65
| Shape | Weight (lb/ft) | Depth (in) | Flange width (in) |
|---|---|---|---|
| W18x60 | 60 | 18.2 | 7.56 |
| W18x71 | 71 | 18.5 | 7.64 |
| W18x55 | 55 | 18.1 | 7.53 |
See every W18 size in the W18 beam sizes chart, or compare all shapes in the wide flange beam sizes chart. Working in millimetres? W18x65 is listed as W460x97 in the metric wide flange beam sizes chart.
W18x65 FAQ
What does W18x65 mean?
W means wide flange. The first number (18) is the nominal depth in inches, and the second number (65) is the weight in pounds per foot. The actual depth of W18x65 is 18.4 in. How to read steel beam sizes.
How much does a W18x65 beam weigh?
W18x65 weighs 65 lb per foot (97 kg per meter). A 20 ft beam weighs about 1,300 lb. Use the calculator above for any length.
What is the metric equivalent of W18x65?
The metric (SI) designation is W460x97: 467 mm deep with a 193 mm flange and 97 kg/m.
How far can a W18x65 beam span?
Span depends on the load, support conditions, deflection limits and local building code, so it cannot be read from a size table. A licensed structural engineer must size any beam that carries a load.
Source: AISC Shapes Database v16.0, consistent with the AISC Steel Construction Manual, 16th Edition. Last updated: September 2026.
This page is reference information only and is not engineering advice. Do not use it for a specific design without verification by a licensed engineer or architect. Full disclaimer.