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Watts ↔ Amps Calculator

Convert between watts and amps on a DC system at 12, 24 or 48 V.

DC: P = V × I · free · no account

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Result

Current
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DC: power = volts × amps.
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Watts, volts and amps

On DC, power (W) = voltage (V) × current (A). So amps = watts ÷ volts. Higher system voltages carry the same power at lower current — which is why bigger builds move to 24 or 48 V.

Questions

Does voltage matter?

Yes — the same wattage draws far fewer amps at 48 V than 12 V, which cuts cable size and cost.

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Planning aid — not a substitute for a licensed electrician. Wattonomy sizes to ABYC E-11 / ISO 13297 / BS 7671 / AS/NZS 3008, but every install has factors a calculator can't see. Verify against the hardware datasheets and your local code, and have the work checked by a professional. Improper electrical work can cause fire, injury or death.