W24x76 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W24x76 is an American wide-flange beam 23.9 inches (607.1 mm) deep with a 8.99 in (228.3 mm) flange, weighing 76 pounds per foot (113.1 kg/m) — that is what the "76" in the designation means. All values below are the standard AISC published section properties used in US structural design, with metric equivalents alongside.
Typical uses: floor and roof framing, columns, headers, and general steel construction. For a quick stiffness check, see the deflection example below or open the beam calculator with your own span and load.
Dimensions
| Depth d | 23.9 in (607.1 mm) |
| Flange width bf | 8.99 in (228.3 mm) |
| Web thickness tw | 0.44 in (11.2 mm) |
| Flange thickness tf | 0.68 in (17.3 mm) |
Weight & Cross-Section
| Weight per foot | 76 lb/ft (113.1 kg/m) |
| 20 ft bar | 1,520 lb |
| 40 ft bar | 3,040 lb |
| Area A | 22.4 in² (144.5 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 2,100 in⁴ (87,408 cm⁴) |
| Section modulus Sx | 176 in³ (2,884 cm³) |
| Radius of gyration rx | 9.69 in |
| Moment of inertia Iy | 82.5 in⁴ (3,434 cm⁴) |
| Section modulus Sy | 18.4 in³ (302 cm³) |
| Radius of gyration ry | 1.92 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W24x68 | 23.7 × 8.97 | 68 | 1,830 | 154 | −11 % | −13 % |
| W24x76 (this page) | 23.9 × 8.99 | 76 | 2,100 | 176 | — | — |
| W24x84 | 24.1 × 9.02 | 84 | 2,370 | 196 | +11 % | +13 % |
Deflection example
A simply supported W24x76 spanning 38 ft with a 10 kip point load at midspan deflects 0.32 in (E = 29,000 ksi, Ix = 2,100 in⁴). The L/360 serviceability limit for this span is 1.27 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W24x76 beam weigh?
W24x76 weighs 76 pounds per foot (113.1 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 1,520 lb and a 40 ft bar 3,040 lb.
What are the dimensions of a W24x76?
W24x76 is 23.9 in (607.1 mm) deep with a 8.99 in (228.3 mm) wide flange. The web is 0.44 in thick and the flanges are 0.68 in thick. Note the actual depth differs from the nominal W24 label — always design with the actual value.
What are the dimensions of a W24x76 in mm?
W24x76 is 607.1 mm deep with a 228.3 mm wide flange; the web is 11.2 mm and the flange 17.3 mm thick. In metric section properties: Ix = 87,408 cm⁴, Sx = 2,884 cm³.
How much does a W24x76 weigh in kg?
113.1 kg per meter. A 6 m bar weighs 679 kg and a 12 m bar 1,357 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W24x76?
About the strong axis, Ix = 2,100 in⁴ (87,408 cm⁴) with section modulus Sx = 176 in³. About the weak axis, Iy = 82.5 in⁴ and Sy = 18.4 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W24x76 or W24x84 — what does one size up change?
W24x84 is about 11% heavier (84 vs 76 lb/ft) but about 13% stiffer (Ix 2,370 vs 2,100 in⁴). Going one step up within the same depth group is usually the cheapest way to cut deflection.
Values are entered from the governing standard’s published tables and cross-checked programmatically against its mass and section formulas before publication. Spotted an error? Write to advertising@metalabout.net — verified corrections ship within days. About