W14x99 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W14x99 is an American wide-flange beam 14.2 inches (360.7 mm) deep with a 14.6 in (370.8 mm) flange, weighing 99 pounds per foot (147.3 kg/m) — that is what the "99" 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 | 14.2 in (360.7 mm) |
| Flange width bf | 14.6 in (370.8 mm) |
| Web thickness tw | 0.485 in (12.3 mm) |
| Flange thickness tf | 0.78 in (19.8 mm) |
Weight & Cross-Section
| Weight per foot | 99 lb/ft (147.3 kg/m) |
| 20 ft bar | 1,980 lb |
| 40 ft bar | 3,960 lb |
| Area A | 29.1 in² (187.7 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 1,110 in⁴ (46,202 cm⁴) |
| Section modulus Sx | 157 in³ (2,573 cm³) |
| Radius of gyration rx | 6.17 in |
| Moment of inertia Iy | 402 in⁴ (16,732 cm⁴) |
| Section modulus Sy | 55.2 in³ (905 cm³) |
| Radius of gyration ry | 3.71 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W14x90 | 14 × 14.5 | 90 | 999 | 143 | −9 % | −10 % |
| W14x99 (this page) | 14.2 × 14.6 | 99 | 1,110 | 157 | — | — |
| W14x109 | 14.3 × 14.6 | 109 | 1,240 | 173 | +10 % | +12 % |
Deflection example
A simply supported W14x99 spanning 23 ft with a 10 kip point load at midspan deflects 0.14 in (E = 29,000 ksi, Ix = 1,110 in⁴). The L/360 serviceability limit for this span is 0.77 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W14x99 beam weigh?
W14x99 weighs 99 pounds per foot (147.3 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 1,980 lb and a 40 ft bar 3,960 lb.
What are the dimensions of a W14x99?
W14x99 is 14.2 in (360.7 mm) deep with a 14.6 in (370.8 mm) wide flange. The web is 0.49 in thick and the flanges are 0.78 in thick. Note the actual depth differs from the nominal W14 label — always design with the actual value.
What are the dimensions of a W14x99 in mm?
W14x99 is 360.7 mm deep with a 370.8 mm wide flange; the web is 12.3 mm and the flange 19.8 mm thick. In metric section properties: Ix = 46,202 cm⁴, Sx = 2,573 cm³.
How much does a W14x99 weigh in kg?
147.3 kg per meter. A 6 m bar weighs 884 kg and a 12 m bar 1,768 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W14x99?
About the strong axis, Ix = 1,110 in⁴ (46,202 cm⁴) with section modulus Sx = 157 in³. About the weak axis, Iy = 402 in⁴ and Sy = 55.2 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W14x99 or W14x109 — what does one size up change?
W14x109 is about 10% heavier (109 vs 99 lb/ft) but about 12% stiffer (Ix 1,240 vs 1,110 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