MEASURE. CALCULATE. CHOOSE.

LED strip calculators for your next project

Work out your LED strip load, check an analog controller, or estimate the light output a room needs. Use the specifications for the exact model and colour temperature you plan to buy.

Build a complete project →See wiring diagrams →
3connected planning toolsPower · control · room brightness

CALCULATE YOUR LOAD. FIND YOUR POWER SUPPLY.

1. LED strip power supply calculator & selector

Match your LED strip load to real constant-voltage DC power supplies. Start with the maximum power for your exact LED strip model.

The location above is for the power supply itself. An outdoor LED strip can use an indoor supply when that supply is installed in a suitable dry location.

How the power supply matching works

LED strip load = metres × W/m
Total load = LED strip load + accessory load
Minimum supply rating = total load ÷ 0.8
Planning target = minimum supply rating rounded up to 10W

Matches must cover both the target watts and target current at the exact DC output voltage, AC input range, installation environment and dimming method. We show reviewed models currently listed with positive stock quantity; price and availability are confirmed on the product page. A supply with a larger series number may have a lower rating at your selected voltage.

Long runs need properly rated wiring and feed points. Do not join the outputs of separate power supplies unless the manufacturer specifically permits parallel operation. Mains connections require a qualified installer.

Browse all power supplies →Read the power calculation guide →

2. LED strip controller load calculator

Check a constant-voltage analog PWM controller using the maximum load for one channel and the entire controller.

Which LED strip controllers can I check?

This checks electrical loading for analog constant-voltage PWM controllers only. Enter the worst-case channel load from the LED strip datasheet; do not divide total RGB or RGBW watts evenly unless the datasheet confirms that split. For a single-colour LED strip, channel load equals total load.

We reserve 20% headroom for this planning check. Voltage and current capacity alone do not prove compatibility: confirm channel count, common-anode/cathode wiring, dimming method and connections. SPI pixel limits, DMX universes, DALI addressing, mains and constant-current controllers need a separate model-specific check.

Find controller categories →Controller selection guide →

3. LED strip room brightness & length calculator

Start with your room area and target average illuminance. Estimate source lumens, then work out the LED strip length or the lumens per metre your available length must provide.

The filled values are an example, not recommended lighting levels. Select the target for your activity. Replace utilisation, maintenance and diffuser factors with project data. If the quoted lumens already include the diffuser, use transmission = 1.

How we estimate LED strip light output

Required source lumens = area (m²) × lux ÷ (utilisation × maintenance × transmission)
LED strip length = source lumens ÷ LED strip lm/m
Required lm/m = source lumens ÷ available LED strip length

This lumen-method estimate assumes distributed illumination and reports an average. It does not predict shadows, glare, minimum illuminance or uniformity. Cove and other indirect LED strip lighting depend strongly on mounting, room height and surface reflectance. Include existing lighting separately; the result assumes the LED strip supplies the full target.

Use white-channel output for the selected CCT, not combined RGB output. Confirm photometric performance and cut intervals before buying. A plan or light measurement is needed to verify the finished installation.

DOE: lighting quantities and units · ERCO: maintenance factor

Find LED strip options for this brightness →

Send the calculated lm/m target with your chosen CCT, voltage and installation layout. We will check actual model specifications and the matching power supply and controller.

Explore COB LED strip lights →Explore white LED strip options →

Bring your LED strip calculations into a project

Copy your calculated values for reference, or send them to our team with a drawing. Our team can check the specific LED strip, power supply, controller and feed points together.

Send calculations to our team →Open project builder →

24V driver connection and built-in dimming example