Free professional-grade calculators for designing safe, correctly-specified WLED LED installations. No sign-up required.
Undersized power supplies, missing fuses, and incorrect wire gauges are the most common causes of LED installation failures — and fires. These calculators take the guesswork out of the technical side.
Planning an addressable LED installation requires accurate calculations before you buy a single component. The wrong power supply rating can cause voltage drop, flickering, or premature failure. The wrong wire gauge creates a fire hazard. A missing fuse is the single most dangerous omission in any LED build.
The WLED Power Calculator handles the complete calculation chain: enter your LED strip type, density, and length, and it instantly returns your theoretical maximum current draw, a realistic real-world estimate, the recommended PSU rating, the minimum wire gauge, the correct fuse size, and whether your system needs a level shifter.
The Voltage Drop Calculator is a focused tool for longer installations. It models the resistance of your wire run, calculates the exact voltage arriving at the end of your strip, and tells you how many power injection points to add and at what intervals.
The Running Cost Estimator calculates electricity cost based on regional rates for Australia, the United States, the UK, Europe, and Canada. At realistic mixed-effect brightness levels, most WLED installations cost less to run than a single incandescent light bulb.
These three calculators cover the complete power design workflow for a WLED LED installation. They are designed to be used together: start with the Power Calculator to determine your PSU, fuse, and wire gauge, then use the Voltage Drop Calculator to verify long runs and plan injection points, and finally use the Running Cost Estimator to project your electricity costs.
The Power Calculator is the essential first step for any WLED installation. Input your LED strip type, LED density (LEDs per metre), total strip length, operating voltage, and usage profile — the calculator returns your theoretical maximum current, real-world estimated current, recommended fuse rating, minimum wire gauge, data resistor specification, level shifter requirement, and power injection plan. It uses actual manufacturer current draw figures for each supported chipset, not estimates.
The tool supports WS2812B, SK6812 RGBW, APA102, WS2815, WS2811, and custom strip configurations. The usage profile (defaulting to 70% for typical mixed WLED effects) adjusts the real-world estimate to reflect how the strip will actually operate rather than the theoretical maximum that only occurs with a solid full-white scene.
On strips over 2–3 metres, resistive voltage drop through the strip's copper traces and the power feed wires becomes significant. At 5V, a drop of 0.5V causes visible colour inaccuracy — LEDs at the far end of the strip appear dimmer and often show a warm cast as the blue and green channels drop out before red. The Voltage Drop Calculator models the actual resistance of your chosen wire gauge and strip type, shows you the voltage at the midpoint and far end of the strip, and generates a concrete power injection plan with the exact spacing your installation needs.
LED strips are efficient compared to incandescent lighting but not trivial in power consumption. A 5-metre WS2812B 60 LED/m strip running ambient effects at 50% brightness draws around 20–25W continuously. Running 8 hours per day at typical electricity rates, that is $20–40 per year depending on location. The Running Cost Estimator calculates hourly, daily, monthly, and annual costs using your actual electricity tariff and a configurable brightness/usage profile, giving you an accurate projection before committing to a large installation.