Inputs

ASCE 7 wind method: qz = 0.00256 × Kz × Kzt × Kd × V2; F = qz × G × Cf × Af.

Basic design wind speed in miles per hour.

Use the coefficient for the sign height and exposure category.

Default is 1.00 where topographic speed-up does not apply.

ASCE 7 sign default is commonly 0.85.

Default gust effect factor for rigid signs is often 0.85.

Solid sign coefficient varies by aspect ratio; 1.2 is a common starting value.

Projected area normal to wind.

Vertical distance from pole base to the sign centroid.

Results

Results update automatically as inputs change.

Velocity pressure qz 0.00256 × Kz × Kzt × Kd × V2
--
Design force F qz × G × Cf × Af
--
Pole base overturning moment F × height to centroid
--
Overturning moment for anchor checks ft-lb × 12
--

Input Summary

Input Value
Wind speed V--
Kz--
Kzt--
Kd--
G gust factor--
Cf force coefficient--
Sign area Af--
Height to centroid--

Anchor Worksheet

Demand item Value or worksheet equation
Horizontal base shear to anchor group --
Overturning moment at base --
Moment for anchor tension checks --
Total tension/compression couple using row spacing s in inches --
Tension per tension-side anchor with nt anchors sharing uplift --

Anchor worksheet values are demand-side outputs; select anchor geometry, material capacity, load combinations, and edge conditions under the current governing code.

Self-tests

Golden cases verify the qz and F core calculation functions.

Self-tests: not run

About the Sign Wind Load Calculator

Sign contractors, structural engineers, and permitting teams use a sign wind load calculation to estimate pressure, force, and overturning moment for freestanding or attached signs. The worksheet follows ASCE 7 wind-pressure concepts so early designs can account for wind speed, exposure, height, directionality, gust effects, projected area, and support reactions.

How it works

  1. Enter design wind speed, exposure category, height, and topographic factors.
  2. Add sign dimensions, projected area, and force coefficients as required.
  3. Review velocity pressure, total wind force, and overturning moment.
  4. Compare reactions with post, footing, wall attachment, or frame capacity.
  5. Have a qualified professional verify final values for permit drawings.

Frequently asked questions

What is the ASCE 7 velocity pressure equation for wind load?

In US customary units, ASCE 7 wind design commonly uses qz equals 0.00256 times Kz times Kzt times Kd times V squared, with other factors applied as required by the load case.

Does sign area mean the full panel size or projected area?

Wind force is based on the projected area normal to the wind direction, adjusted by the applicable force coefficient and configuration rules. Irregular signs may need engineering judgment.

Why does exposure category matter for a sign?

Exposure reflects surrounding terrain and affects wind pressure with height. Open terrain generally creates higher pressure than dense urban or suburban surroundings.

Can this calculator replace a stamped sign design?

No. It is an estimating aid. Final sign structures, connections, foundations, and attachments may require a licensed design professional and local building department approval.

References