Yes, the Wind Profile Calculator is free and requires no registration.

What height range is supported?

The tool produces a 20-step table and chart from 5–200 m; reference height and speed can be entered freely.

How do I choose the roughness class (z₀)?

Click the row closest to your site's terrain type in the "Roughness Classes" table; 9 classes are offered, from water surfaces to skyscraper city centres.

Is this enough for a facade wind load calculation?

No. This tool only gives free-stream speed and dynamic pressure; pressure coefficients and zonal loads require the WindCalc module.

Can the results be used directly in a project?

The calculation is for preliminary assessment. CFD-based analysis is recommended for complex terrain or dense surroundings.

Wind Profile Calculator

Logarithmic profile · height-dependent wind speed & dynamic pressure

Parameters

Ref. Height

Wind Speed

m/s

Roughness Class (z₀)

Air Density

kg/m³

v₂ = v₁ · ln(h₂/z₀) / ln(h₁/z₀)

v₁ ref. speed · h₁ ref. height · h₂ target height · z₀ roughness length

⚠ The logarithmic wind profile is valid for flat terrain and neutral atmospheric stratification. For complex topography, CFD analysis is recommended. Contact us →

Roughness Classes

Class	z₀	Land Cover Type
0	0.0002	Water surfaces: seas, lakes
0.5	0.0024	Open flat terrain, concrete, runways
1	0.03	Open agricultural land, no fences
1.5	0.055	Agricultural land w/ sparse buildings
2	0.1	Agricultural land w/ buildings & hedges
2.5	0.2	Wooded agricultural land, many trees
3	0.4	Towns, villages, forests, rough terrain
3.5	0.6	Large cities with tall buildings
4	1.6	Metropolis with skyscrapers

150m Speed

—

m/s

100m Speed

—

m/s

150m Pressure

—

Vertical Wind Profile

Detailed Results

Height	Speed	Pressure	kg/m²

The Wind Profile Calculator uses the logarithmic boundary-layer law to compute wind speed and dynamic pressure at any height from a known reference speed at a reference height. It is free to use and requires no registration.

Method and formulas

Logarithmic wind profile: v₂ = v₁ · ln(h₂/z₀) / ln(h₁/z₀) — v₁ is the known speed at reference height h₁, v₂ the speed at target height h₂, and z₀ the roughness length.
Dynamic pressure: q = ½ · ρ · v² (ρ ≈ 1.225 kg/m³ standard air density; adjustable in the tool)
kg/m² equivalent: q / 9.80665

The roughness length (z₀) is chosen from a 9-step scale in the tool, from 0 (water surfaces, z₀ = 0.0002 m) to 4 (metropolis with skyscrapers, z₀ = 1.6 m) — the same boundary-layer logic that feeds into EN 1991-1-4 wind-engineering practice.

Worked example

With the tool's default inputs (reference height 10 m, reference speed 5 m/s, roughness class 2 → z₀ = 0.1 m, ρ = 1.225 kg/m³), the calculation proceeds step by step:

Step	Operation	Result
ln(h₁/z₀)	ln(10 / 0.1)	4.605
Speed at 150 m	5 × ln(150/0.1) / 4.605	7.94 m/s
Speed at 100 m	5 × ln(100/0.1) / 4.605	7.50 m/s
Dynamic pressure at 150 m	0.5 × 1.225 × 7.94²	38.6 Pa (≈3.94 kg/m²)

These are the exact figures shown in the "150m Speed / 150m Pressure" boxes and the detailed results table when you open the tool with its default settings.

When this tool is not enough

The profile is valid for flat, homogeneous terrain under neutral atmospheric stratification; it can deviate over complex topography (valleys, hills, coastlines).
It does not account for speed-up (funnelling) or sheltering caused by neighbouring buildings in dense urban settings.
It does not produce facade pressure coefficients (c_pe/c_pi) or zonal loads — only free-stream speed and dynamic pressure.
When an authority or insurer requires a detailed analysis, or when massing options must be compared before geometry is fixed, CFD-based analysis is recommended.

To calculate facade wind load including pressure coefficients, see the Alkazar WindCalc module; for complex geometry and surroundings, see our Structure Wind Consultancy service.

Frequently asked questions

Is the tool free?: Yes, the Wind Profile Calculator is free and requires no registration.
What height range is supported?: The tool produces a 20-step table and chart from 5–200 m; reference height and speed can be entered freely.
How do I choose the roughness class (z₀)?: Click the row closest to your site's terrain type in the "Roughness Classes" table; 9 classes are offered, from water surfaces to skyscraper city centres.
Is this enough for a facade wind load calculation?: No. This tool only gives free-stream speed and dynamic pressure; pressure coefficients and zonal loads require the WindCalc module.
Can the results be used directly in a project?: The calculation is for preliminary assessment. CFD-based analysis is recommended for complex terrain or dense surroundings.

Structure Wind Consultancy service All engineering tools Facade Wind Load (WindCalc) Türkçe sürüm Contact

The explanation on this page is for general information and does not replace project-specific engineering services. Final values should be determined under the currently applicable edition of the relevant standard.