W14x90 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W14x90 is an American wide-flange beam 14 inches (355.6 mm) deep with a 14.5 in (368.3 mm) flange, weighing 90 pounds per foot (133.9 kg/m) — that is what the "90" 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 | 14 in (355.6 mm) |
| Flange width bf | 14.5 in (368.3 mm) |
| Web thickness tw | 0.44 in (11.2 mm) |
| Flange thickness tf | 0.71 in (18 mm) |
Weight & Cross-Section
| Weight per foot | 90 lb/ft (133.9 kg/m) |
| 20 ft bar | 1,800 lb |
| 40 ft bar | 3,600 lb |
| Area A | 26.5 in² (171 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 999 in⁴ (41,581 cm⁴) |
| Section modulus Sx | 143 in³ (2,343 cm³) |
| Radius of gyration rx | 6.14 in |
| Moment of inertia Iy | 362 in⁴ (15,068 cm⁴) |
| Section modulus Sy | 49.9 in³ (818 cm³) |
| Radius of gyration ry | 3.7 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W14x82 | 14.3 × 10.1 | 82 | 881 | 123 | −9 % | −12 % |
| W14x90 (this page) | 14 × 14.5 | 90 | 999 | 143 | — | — |
| W14x99 | 14.2 × 14.6 | 99 | 1,110 | 157 | +10 % | +11 % |
Deflection example
A simply supported W14x90 spanning 22 ft with a 10 kip point load at midspan deflects 0.13 in (E = 29,000 ksi, Ix = 999 in⁴). The L/360 serviceability limit for this span is 0.73 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W14x90 beam weigh?
W14x90 weighs 90 pounds per foot (133.9 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 1,800 lb and a 40 ft bar 3,600 lb.
What are the dimensions of a W14x90?
W14x90 is 14 in (355.6 mm) deep with a 14.5 in (368.3 mm) wide flange. The web is 0.44 in thick and the flanges are 0.71 in thick. Note the actual depth differs from the nominal W14 label — always design with the actual value.
What are the dimensions of a W14x90 in mm?
W14x90 is 355.6 mm deep with a 368.3 mm wide flange; the web is 11.2 mm and the flange 18 mm thick. In metric section properties: Ix = 41,581 cm⁴, Sx = 2,343 cm³.
How much does a W14x90 weigh in kg?
133.9 kg per meter. A 6 m bar weighs 804 kg and a 12 m bar 1,607 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W14x90?
About the strong axis, Ix = 999 in⁴ (41,581 cm⁴) with section modulus Sx = 143 in³. About the weak axis, Iy = 362 in⁴ and Sy = 49.9 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W14x90 or W14x99 — what does one size up change?
W14x99 is about 10% heavier (99 vs 90 lb/ft) but about 11% stiffer (Ix 1,110 vs 999 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