Amps to Watts Calculator

Amperes (amps) measure electrical current, while watts measure electrical power. The relationship between them depends on voltage, which in Europe is standardized at 230V for single-phase household connections and 400V for three-phase connections.

Knowing how to convert between amps and watts is important for several practical reasons. Circuit breakers in your electrical panel are rated in amps. A typical European household circuit uses 16A breakers, which means each circuit can handle up to 3,680W (16A x 230V). If you connect appliances that draw more than this combined, the breaker will trip.

This is particularly relevant for high-power appliances like electric ovens (2,000-3,000W), electric kettles (1,500-3,000W), and space heaters (1,000-2,500W). Running multiple high-power appliances on the same circuit can exceed its capacity. For example, a 2,500W oven and a 2,200W kettle on the same 16A circuit would draw about 20.4A total, tripping the breaker.

EV chargers are another common case. A home wallbox charging at 7.4 kW on a single-phase connection draws about 32A, which requires a dedicated circuit with an appropriately rated breaker. Three-phase chargers at 11 kW or 22 kW distribute the load across three phases.