LED Matrix Power Calculator

Estimate current draw + power for LED matrix panels (mono/RGB). Includes multiplex scan (1/N), brightness assumptions, PSU sizing headroom, and Show Work.

How to Use

  1. Select Mono or RGB and enter matrix size (rows × columns).
  2. Enter typical LED current and (optional) forward voltage assumptions.
  3. Set multiplex scan (1/N) and brightness/duty for realistic averages.
  4. Review outputs: average current, peak current, power, and recommended PSU.
Inputs & Settings
This tool estimates current/power using simple engineering assumptions. Show Work uses base units for clarity.
RGB assumes 3 LEDs per pixel (R, G, B) unless overridden.
Use this if you’re chaining multiple identical panels.
Common: 8, 16, 32, 64
Common: 8, 16, 32, 64, 128
Leave blank to auto: Mono=1, RGB=3.
Typical indicator LEDs: 5–20mA. High-brightness can be higher.
If unknown, you can leave blank and the tool will estimate power from supply voltage instead.
Common: 5V HUB75, 12V strips, 24V systems.
Average current is scaled by scan ratio (duty). Peak current can still be high during active rows.
This models “typical use,” not worst-case full white @ 100%.
If you have a DC/DC stage, efficiency affects input power draw.
Typical recommendation: +20–30% for transients and longevity.
Show Work (step-by-step)
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Work is shown in base units (V, A, W) and includes scan + brightness assumptions.

Reference Notes

  • Average vs peak: Multiplexing reduces average current by duty (1/N), but instantaneous current on active rows/columns can still be high.
  • RGB “white”: Full white drives R+G+B together (3 channels). Typical content is lower than full white.
  • Forward voltage: If Vf is unknown, power estimation from supply voltage is common for PSU sizing.
  • Headroom: PSU sizing should include margin for transients, cable losses, and long-term reliability.

FAQ

Why are my real measurements lower than “worst-case”?

Most content isn’t full white at 100% duty, and multiplexing + brightness control reduce average current significantly.

Should I size for average or peak current?

For the PSU, size for average power with headroom. For wiring/connectors, consider peak/current pulses and use adequate gauge + multiple power injection points when needed.

What scan rate should I choose?

Use your panel’s actual scan ratio (common HUB75 panels are often 1/16 or 1/32). If unknown, start with 1/16 and verify against your panel documentation.

Tool Info

Last updated:

Updates may include UI improvements, additional presets, and edge-case handling.