免費・快速・免註冊

電氣與電子計算機

為電工、電子愛好者與工程學生打造的快速準確計算工具，所有計算都立即在瀏覽器中完成。

基礎與歐姆定律

The core electrical relationships — Ohm's law, power, and how voltage and current divide in a circuit. The starting point for almost every other calculation.

電阻與電容

Read resistor and capacitor codes, pick the right series resistor for an LED, and combine components in series or parallel.

電力、配線與電源

Size cables and conduit, work out voltage drop, three-phase power, transformer and motor ratings. Always check a final design against your local electrical code.

家庭能源與電費

Work out what your electricity actually costs. These calculators apply the real tax stack of your country — energy tax, grid fees, VAT and, where it exists, a subsidised quota or progressive block tariff — instead of multiplying kWh by a single price.

供暖與電動車

Size electric heating and EV charging for a home — sauna heaters, room and underfloor heating, charging time and peak demand.

太陽能、儲能與電動車

Plan solar, battery and EV installs: backup runtime, low-voltage DC cable sizing, charger load sharing and charging cost.

電子電路設計

Design small electronics circuits — RC filters, 555 timer stages and battery runtime.