Lighting
LED Strip Power Calculator
LED Strip Power helps you find strip power from strip length and power per meter. The page keeps the arithmetic visible so you can check the result against the original measurements.
Enter values for Strip power
Use measurements from one operating condition.
How the result is calculated
This page evaluates P = length × W/m. Only Strip length and Power per meter enter the numerical result.
For the example shown, strip power equals 115.20 W. Treat that value as a demonstration, not a recommendation.
Calculate strip power from strip length and power per meter. LED Strip Power Supply Calculator provides the related minimum supply rating check.
Values this page needs
Keep lumens, candela, lux, and foot-candles on the correct geometric basis. Nameplate and meter values are not interchangeable unless they describe the same condition.
Convert units once, retain the original reading, and verify the converted magnitude.
- Strip length
- Default example: 8 m. Enter strip length in m.
- Power per meter
- Default example: 14.4 W/m. Enter power per meter in W/m.
Applying the result
Read Strip power as the outcome of this equation, not as automatic equipment approval. Compare it with initial, maintained, and worst-case lighting conditions.
Store the measurement state and conversion notes with the answer.
What the formula leaves out
Long runs may need power injection.
Additional checks may be needed for daylight variation, control behavior, depreciation, and spatial uniformity. Use measurements, manufacturer data, or another calculation for effects that can change the decision.
Record reflectance, maintenance condition, beam definition, and measurement location.
Sensitivity check
Change Strip length from 8 m to 9.6 m as the sole changed variable. The two results are 115.20 W to 138.24 W.
The comparison demonstrates sensitivity, not a guaranteed field response.
Keep a reproducible record
Save strip length and power per meter with strip power. Add the date and any unit conversion.
Transfer strip power as the raw numerical value until the final step. Do not round between dependent calculations.
A practical checking sequence
Begin by confirming strip length at the operating point represented by the other entries. Record whether it came from a meter, nameplate, data sheet, or design assumption.
The displayed strip power should be checked against the fixture photometric file and the measured task plane. Investigate an unexpected magnitude before changing the model or adding margin.
Keep a baseline and vary the least certain measurement first. A separate analysis may be needed for driver efficiency, optical loss, surface reflectance, and beam-edge definition.