calc.engineer / Solar & Power / Watts To Amps

Watts To Amps v1.0.0

Converts electrical power in watts to current in amps (and milliamps) for a given voltage, using the DC power formula P = V * I. Also computes the implied load resistance via Ohm's law (R = V / I) assuming a purely resistive load. This is the most common electrical conversion for circuit design, fuse selection, wire sizing, and breaker rating. Use the output amps value to feed into wire_gauge for conductor sizing or voltage_drop for cable loss analysis. Covers DC circuits; for AC with power factor, adjust watts to true power first.

feeds wire_gauge →feeds voltage_drop →
Power in watts (W)
Voltage in volts (V)
Fill in the inputs and Compute to see the structured result.

From an agent (MCP) or the API

curl -X POST https://calc.engineer/api/watts_to_amps \
  -H "Content-Type: application/json" \
  -d '{"watts": …, "voltage_v": …}'

MCP: connect to https://calc.engineer/mcp and call watts_to_amps.

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