LedWatts · electrical

LedWatts led strip watts

Size a power supply before ordering LED strip for a run length

TECHNICAL UTILITY · LED_STRIP_WATTS

Result

Enter values to begin.

total_watts=length_ft·watts_per_ft; amps_at_12v=total_watts/12

How to use this estimate

Compute LED strip total wattage and approximate 12 V current from length and watts per foot. How it works: total_watts=length_ft·watts_per_ft; amps_at_12v=total_watts/12. Out of scope: 24 V strips without adjusting amps formula; PWM dimming losses; aluminum channel thermal derates; wire AWG voltage drop. This is an approximate screening estimate, not a substitute for manufacturer charts or a full engineering design. Does not certify code compliance; confirm manufacturer data where it applies.

Sources, methodology, and assumptions

Methodology

total_watts=length_ft·watts_per_ft; amps_at_12v=total_watts/12

Assumptions

Constant W/ft from datasheet; 12 V DC screen for amps. This is an approximate screening estimate, not a substitute for manufacturer charts or a full engineering design.

Out of scope

24 V strips without adjusting amps formula; PWM dimming losses; aluminum channel thermal derates; wire AWG voltage drop

Sources

NIST SP 811 — unit consistency context (not exact formula page) — NIST
NIST SI electrical units context — NIST

Last technically reviewed: 2026-09-11