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Calcimator

Metal Panel Calculator

Panel count and sub-framing for ACM or metal cladding.

About this calculator

Panel Thickness controls Total Weight (lbs) through a hard on/off threshold rather than a gradual curve: at 0.125 in (3mm ACM) or thinner the weight rate is 1.6 lb/sqft, and anything even slightly thicker jumps straight to 2.2 lb/sqft -- a 37.5% step with nothing in between. That threshold sits EXACTLY at this calculator's own default Panel Thickness, so the smallest possible increase from the default (a hundredth of an inch) triggers the full jump.

That can make Panel Thickness look disproportionately powerful right at the default, but zoom out and the picture flips: Wall Area is the only input with a smooth, always-proportional effect on Total Weight (10% more area is always exactly 10% more weight), and across any realistic range of wall sizes it's Wall Area -- not which side of the thickness threshold you land on -- that sets the vast majority of the figure. Design Wind Pressure (+ and −, psf) responds positively to both Design Wind Speed and Building Height, verified across each input's full declared range -- taller buildings and higher design wind speeds both raise the pressure the panels must be engineered to resist, per the ASCE 7 velocity-pressure formula this calculator implements.

Inputs

sq ft
in
in
in
mph
ft
%

Results

Panels to order

35

Wind pressure + (psf)

26.9

Sub-frame channels (LF)510
Panel clips54
Self-drilling screws496
Wind pressure − (psf)32.9
Total weight (lbs)1,600
How to Use This Calculator
  1. Enter Net Wall Area in sq ft — the surface receiving metal or ACM panels after openings.
  2. Set Panel Width and Panel Height in inches to match your specific panel product.
  3. Enter Panel Thickness and Design Wind Speed (mph) per ASCE 7 for your site.
  4. Set Building Height above grade — taller buildings experience higher wind pressures.
  5. Review Panels to Order, Sub-Frame Channels (LF), Panel Clips, Design Wind Pressure (psf), and Total Weight (lbs).

How the result changes with Wall area (sq ft)

Wall area (sq ft)Panels to orderWind pressure + (psf)
5001826.9
7502626.9
1,5005126.9
2,5008526.9

What each input means

Wall area (sq ft)
Net facade area to be clad in metal panels.
Panel width (in)
Width of each metal/ACM panel.
Panel height (in)
Height of each metal/ACM panel.
Panel thickness (in)
Panel thickness (3mm ACM ≈ 0.125", 4mm ≈ 0.157").
Design wind speed (mph)
Ultimate design wind speed per ASCE 7.
Building height (ft)
Height of facade above grade.
Waste allowance (%)
Extra panels for cuts and fitting.

What each result means

Panels to order
Metal/ACM panels including waste.
Sub-frame channels (LF)
Total linear feet of hat channel/tube sub-framing.
Panel clips
Number of attachment clips at framing intersections.
Self-drilling screws
Total fasteners for clips and panel attachment.
Wind pressure + (psf)
Positive (inward) design wind pressure on panels.
Wind pressure − (psf)
Negative (suction) design wind pressure on panels.
Total weight (lbs)
Dead load of metal panel cladding.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Wall area (sq ft) = 1000, Panel width (in) = 48, Panel height (in) = 96, Panel thickness (in) = 0.125 = 7 input(s) provided
  2. Calculate Panels to order
    Panels to order = ceil(netPanels * (1 + wastePct / 100))
    35 = 35
  3. Calculate Wind pressure +
    Wind pressure + = qPsf * 0.9
    26.9 = 26.9
  4. Calculate Sub-frame channels
    Sub-frame channels = round(verticalChannelLF + horizontalChannelLF)
    510 = 510
  5. Calculate Panel clips
    54 = 54

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Does Total Weight (lbs) scale smoothly with Panel Thickness?

No -- it's a single on/off switch, not a gradual scale. Panel Thickness up to and including 0.125 in (3mm ACM) uses 1.6 lb/sqft; anything thicker jumps straight to 2.2 lb/sqft, a 37.5% increase with no values in between. This calculator's default Panel Thickness sits exactly at that 0.125 in threshold, so a tiny increase from the default triggers the full jump.

Near the default settings, which moves Total Weight more: a small increase in Wall Area or Panel Thickness?

At this calculator's exact default inputs, a small increase in Panel Thickness crosses the 0.125 in weight-rate threshold and produces a larger jump than the equivalent small increase in Wall Area. But that's a boundary effect specific to the default: across the full range of realistic wall sizes, Wall Area is what actually drives the overwhelming majority of Total Weight, since Panel Thickness only ever contributes one of two fixed rates.

Do taller buildings need panels rated for higher wind pressure?

Yes -- across Building Height's full 8-600 ft range, Design Wind Pressure (+ and −, psf) rises as Building Height increases, following the ASCE 7 velocity-pressure exposure coefficient this calculator uses. Design Wind Speed pushes pressure upward the same way across its full 70-200 mph range.

Does a wider panel mean fewer panels to order?

Yes -- across Panel Width's full 6-72 in range, Panels to Order falls as Panel Width increases, since each panel covers more of the wall area and fewer are needed to reach the same total coverage.

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