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Calculate and visualize power loss in different charging scenarios. Pick the right charging setup.

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Improve your charging efficiency, lower your bills and speed up charging.

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Safeguard people, pets, and critical gear from power disruptions.

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Reduce unnecessary waste and minimize your environmental footprint.

What is power loss?

Power loss is electricity that never does useful work — it turns into heat wherever current meets resistance, following Joule's law (P = I²R). It shows up in charging cables, long or undersized extension cords, hot wiring, devices idling on standby, and misaligned wireless chargers. The figures below come from the same physics this site's calculators use.

  • Cables & cords: the U.S. National Electrical Code recommends no more than 3% voltage drop on a branch circuit (5% including feeders), yet a 1,500 W space heater on a 100 ft, 16 AWG cord drops about 10% — wasting roughly 153 W as heat in the cord. Check your cord's voltage drop.
  • EV charging: Level 2 home charging at 11.5 kW (48 A, 240 V) over a 25 ft run of 6 AWG copper loses only about 0.12% to cable resistance — roughly 14 W of heat in the cable. Calculate your EV charging losses.
  • Heat: copper wire resistance rises about 0.39% per °C, so a cable running at 60 °C wastes roughly 16% more energy than the same cable at 20 °C — one reason rooftop solar wiring losses grow on hot days. Estimate solar wiring losses.
  • Wireless charging: the phone models in our wireless charging calculator reach only 72–77% efficiency even with perfectly aligned coils — about a quarter of the energy drawn becomes heat before it reaches the battery. Compare wireless charging losses.

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