Take your wall’s width times its height, divide by one panel’s area, round up. A 4.8×2.7m wall is 12.96m²; a 500×500mm panel covers 0.25m², so 51.84 rounds to 52 panels. That is the whole LED screen size calculator — and also, usually, the wrong number. No grid builds 52. The formulas are the easy half; the rounding, the weight and the truck pack are where your quote comes from.

The question “how many LED panels do I need” is really three questions wearing one coat: how many cabinets, how many pixels, and how much structure. Answer in that order and quotes stop surprising you.

The Three Formulas

1. Panel count = wall area ÷ panel area, rounded up. A 4.8×2.7m wall is 12.96m². A 500×500mm cabinet covers 0.25m². 12.96 ÷ 0.25 = 51.84. The answer is 52.

Round up. Always. A cabinet is a physical box; a seam takes whole units. If your calculator rounds to nearest, one day it hands you 52 for a job that needs 60, and the gap arrives as a change order with your name on it.

2. Pixels = width in mm ÷ pitch in mm. 4800 ÷ 2.5 = 1,920 px wide. 2700 ÷ 2.5 = 1,080 px tall. A 4.8×2.7m wall at P2.5 is native 1080p — which is exactly why that size shows up in boardroom specs constantly. Run this before the count; resolution is the number your content lives with. Run backwards it works the same: pick the pixels, pitch sets the wall (1,920 px wide needs 2.88m at P1.5, 4.80m at P2.5, 7.68m at P4).

3. Closest viewer in meters ≈ pitch in millimeters. P2.5 works down to roughly 2.5m, P4 wants 4m. It is a comfort rule, not physics, but it has survived thousands of installs and it kills more bad specs than any other check.

Those three lines answer nine walls out of ten. The rest of this page is the same arithmetic with the work already done.

The 60-Second Version

You’re mid-measurement, so here’s the compressed path: measure the wall (width × height in meters; feet? multiply by 0.3048 first) → divide by panel area (0.25m² for 500×500, 0.5m² for 500×1000) and round up → check pitch against the closest viewer → check pixels against the content → send the count for a quote.

Five steps, one tape measure. The tables below are the calculator for the six wall sizes people actually build.

Panel Counts for Common Walls

One terminology trap: the industry says armoire for the rigid tile you mount and module for the boards inside it. Quotes are per cabinet. This page says panel because that’s what you typed into Google — same object here.

500×500mm panels (0.25m² each):

500×1000mm panels (0.5m² each):

*Both 52 and 26 are area-math numbers that don’t build on a strict grid — see the rounding section before you order. Pitch decides the picture; cabinet size decides the count. The image is identical either way — the wider cabinet just halves the line items on the quote and the latches a rental crew touches at load-out.

The Rounding Is the Engineering

51.84 means 52. But which 52? Cabinets stack in whole columns and rows, and 52 factors as 4 × 13 — a 2.0 × 6.5m tower nobody ordered. The real question is which grid you accept, and every option moves the wall:

Three honest outcomes, and all three get priced before recommending one:

Grow the wall — 60 cabinets at 5.0×3.0m, native 2000×1200. The default when the room allows: cleanest seams, 1080p content scales onto it cleanly. It costs nine more cabinets. Check the ceiling and the furniture first.

Shrink the wall — 54 at 4.5×3.0m keeps the height and gives up 300mm of width. Shrinking both ways lands at 45 and 1800×1000 — fine for video, tight for dashboards with fixed layouts, because the 120 missing pixel columns come out of somebody’s spreadsheet design.

Change the cabinet — 500×1000 units halve the arithmetic: 12.96 ÷ 0.5 = 25.92 → 26, which builds as 9 × 3 = 27 at 4.5×3.0m. Fewer units to hang, fewer power and data jumps, faster install. Trade-off: taller cabinets to lift, and spares are model-specific.

I’d rather quote 60 cabinets and a clean wall than 52 and a compromise. Which 52 you get is a conversation about the room, not the calculator.

The Resolution Check

Pitch fixes how many pixels every meter of wall carries. Full HD is 1,920px across; 4K is 3,840px.

Two lines worth memorizing: a 4.8×2.7m wall at P2.5 is exactly 1,920×1,080. And 4K wants twice the wall at the same pitch — 9.6×5.4m at P2.5 — or a finer pitch: 7.68m at P2, 6.92m at P1.8, 5.76m at P1.5. Most rooms can’t spare 9.6m of width, which is why large-format 4K almost always means fine pitch — and fine pitch prices climb faster than pitch shrinks. The full distance-and-pitch logic lives in our pitch guide.

The Cabinet Size Zoo

The 500×500 die-cast cabinet is the default, not the whole zoo. This table doubles as a dimensions guide once drawings fly:

Two field notes: cabinet size has nothing to do with picture quality — pitch sets that, alone. And when a calculator assumes 500×500 but your supplier prices 576×576, every number downstream moves. Ask which cabinet any count is built on; it’s the first question to ask when inheriting another company’s spec.

Weight and Power: What Every Calculator Hides

No calculator outputs load or power. These are the two numbers that stop projects:

Worked through: a 21m² wall at a mid-range 45 kg/m² is 945 kg — a tonne hanging on somebody’s building, and on older concrete the structural answer is sometimes “no”. Power at 500 W/m² is 10.5 kW; a 16A/230V circuit delivers 3.68 kW (2.9 kW usable at 80% derating), so 10.5 ÷ 2.9 ≈ 3.6 — four circuits minimum, six if you want full-white headroom. Heat is power’s quiet twin: 10 kW of LEDs is 10 kW of warm air, and a sealed room has nowhere to put it. That conversation never happens inside a calculator. For permanent installs, cabinet and steelwork options are on our indoor fixed LED display page.

Rental Rigs: Count Cases, Not Panels

Rental fleets think in flight cases — a standard case swallows 4–6 cabinets. Your 84-cabinet festival wall is therefore 14–21 cases: 84 ÷ 6 = 14, 84 ÷ 4 = 21. Trucks, rigging points and per-day rates all key off case counts, so orders round to whole cases with 5–10% spares riding along. Spares follow the same whole-unit logic: five percent of 84 is 4.2, so five spare modules minimum — 4.2 of a module protects nothing. Print the numbers on the case lids; future crews will thank current crews. Case packing and spare ratios: our rental LED buying guide.

Build Your Own Calculator in a Spreadsheet

Five inputs, five formulas, two minutes. Cells: B1 wall width (m), B2 wall height (m), B3 pitch (mm), B4 cabinet width (mm), B5 cabinet height (mm).

CEILING works the same in Excel and Google Sheets. The two counts will disagree — that disagreement is the rounding section, alive in your spreadsheet. Trust the grid count for ordering; use the area count to interrogate quotes.

What to check before trusting any calculator, including this one: which cabinet it assumes (most hard-code 500×500); rounding direction (up is safe, down is how companies win quotes and lose walls); whether it compares pitch to viewing distance; whether it outputs pixels, not just meters; whether weight and power appear anywhere. The spreadsheet doesn’t know your ceiling height. You do.

When the Math Lies

The area formula is honest. Walls are not. Four places a clean number goes wrong:

Curved walls. Tape across the opening gives the chord; cabinets follow the arc, and the gap depends on wrap angle — 40° puts the arc 2% beyond the chord, 60° costs about 5%, 90° costs 11%: a 6m straight-line spec becomes 6.7m of real arc, 13 columns where the flat math said 12. Spec by arc, then round up per face.

Walls that miss the grid. Cabinets can’t be cut. The exits are in the rounding table above — grow, shrink, or change cabinet. All three happen every week; none is a problem until fabrication week, when it gets expensive, so flag it early.

Floor tiles. Walkable LED floors fail on ratings, not counts: static load, point load (a heel concentrates a person onto a square centimeter), IP rating at the seams, slip resistance. Count the panels last.

The architectural niche. When a reveal fixes the opening at 4.8×2.7m, the cabinet chooses itself — often 500×1000, sometimes a trim column at each end. The calculator becomes the junior partner in its own project.

FAQ

How many panels do I need for a 4K wall? 4K is 3,840×2,160px, so pitch sets the wall before any count starts. At P2.5: 9.6×5.4m, about 52m² — 208 panels of 500×500 or 104 of 500×1000. At P1.5: 5.76×3.24m, building as 12×7 = 84 cabinets at 6.0×3.5m. The pitch decision made the wall; the count just followed. The P1.5 version is physically smaller but materially dearer per square meter.

Why does my calculator count disagree with the supplier’s quote? Usually two different cabinets or rounding rules underneath. Ask which grid they priced, column by column. If someone quotes exactly 52 for a 4.8×2.7m wall, be suspicious — 52 does not build.

Do I count panels or cases for rental? Both, for different people. Cabinets belong to the rigging crew: build time, spares, rigging points. Cases belong to logistics: truck space, pack order. An 84-cabinet wall is 14–21 cases. Suppliers quote per cabinet; you move cases.

Does cabinet size affect picture quality? No. Pixel pitch sets resolution, and nothing else does. Cabinet size sets seams, weight, structure, install speed and your spares pool — which is why the zoo matters even though the image doesn’t.

Can I mix cabinet sizes on one wall? On one flat face, no — seams and brightness alignment give it away within a week. Around corners and across L-shapes, matched-pitch mixes are routine and work fine.

From Count to Quote

A count becomes a quote when three numbers travel together: the panel count with its pitch, the closest viewer distance, and the destination — city, floor, lift or loading dock, because freight and structure price a job as much as panels do. The cost pillar shows the band each combination lands in: our LED video wall cost breakdown.

Send the count and the room — we’ll check the rounding, the structure and the price band: https://www.eyecatchmedia.com/contact/