Video & LED calculator
LED Pixel Pitch & Viewing Distance Calculator
The industry rule of thumb is 1 meter of viewing distance per 1 millimeter of pixel pitch: a 3.9 mm wall looks solid from about 4 meters (13 ft). Enter pitch and wall size to get the minimum comfortable distance, the distance where pixels become truly invisible, and the wall resolution in pixels.
Formulas
Rule-of-thumb minimum distance
distance(m) ≈ pitch(mm)- pitch:
- center-to-center LED spacing in mm
Acuity (retina) distance
distance(m) = pitch(mm) × 3438 / 1000- 3438:
- reciprocal of tan(1 arcminute), the 20/20 vision limit
Wall resolution
pixels = size(mm) / pitch(mm), per axisHow it works
Pixel pitch is the distance between LED centers, so it sets both resolution per square meter and cost: halving the pitch quadruples the pixel count. The question "what pitch do I need" is really "how close is the nearest viewer": pitch is bought for the front row, not the back.
Two distances bracket the answer. The 1 m-per-1 mm rule marks where typical content looks acceptably smooth to most viewers; the acuity distance (pitch in mm × 3438 / 1000 m, where one pixel subtends one arcminute for 20/20 vision) marks where individual pixels become physically unresolvable. Between them, image quality is content- and viewer-dependent; past the acuity line, finer pitch buys nothing but cost.
Resolution follows from geometry: a 6 m × 3.5 m wall at 3.9 mm pitch is 1538 × 897 pixels, conveniently close to feeding it 1080p content unscaled. Matching wall resolution to a standard raster simplifies the whole signal chain and is a legitimate reason to nudge wall dimensions during design.
Worked example: Corporate ballroom wall, nearest seats 5 m away, 6 m × 3.5 m surface
- 1.Rule of thumb at 5 m allows a pitch up to about 5 mm; 3.9 mm gives margin for the front tables.
- 2.Acuity distance for 3.9 mm: 3.9 × 3438 / 1000 = 13.4 m; past that, viewers cannot resolve pixels at all.
- 3.Resolution: 6000/3.9 × 3500/3.9 = 1538 × 897 pixels, close enough to map 1920×1080 content with light scaling.
A 3.9 mm product fits the room; finer pitch would be invisible money past 13 m.
Common pitches and distances
| Pitch | Rule-of-thumb minimum | Pixels invisible beyond | Pixels per m² |
|---|---|---|---|
| 1.9 mm | 1.9 m / 6 ft | 6.5 m / 21 ft | 277,000 |
| 2.6 mm | 2.6 m / 8.5 ft | 8.9 m / 29 ft | 148,000 |
| 3.9 mm | 3.9 m / 13 ft | 13.4 m / 44 ft | 65,700 |
| 4.8 mm | 4.8 m / 16 ft | 16.5 m / 54 ft | 43,400 |
| 6.0 mm | 6.0 m / 20 ft | 20.6 m / 68 ft | 27,800 |
| 10 mm | 10 m / 33 ft | 34.4 m / 113 ft | 10,000 |
Field notes
- Camera work changes the math: broadcast close-ups effectively put the "viewer" much closer than any seat, which is why on-camera walls run finer pitch than the room needs.
- Check the panel module resolution divides into your target raster; awkward pitches force scaling on every input.
Frequently asked questions
What pixel pitch do I need for a 20 foot viewing distance?
20 ft is about 6 m, so the rule of thumb allows roughly a 6 mm pitch; a 3.9 or 4.8 mm wall gives comfortable margin for closer viewers and finer content.
What does pixel pitch mean on an LED wall?
The center-to-center distance between LED pixels in millimeters. Smaller pitch means more pixels per area, higher resolution, closer acceptable viewing, and sharply higher cost.
Is a smaller pixel pitch always better?
No. Beyond the distance where pixels are unresolvable (pitch in millimeters × 3.438 meters), finer pitch adds cost, weight, power, and fragility with zero visible benefit. Buy pitch for the nearest viewer, not the spec sheet.