EnergyMeter is a free-to-use app that lets you calculate how many units of electricity are consumed by a device based on its Wattage or Voltage and Ampere. With this information you can make a wise choice about which device is friendly for your electricity bills, and be eco-friendly too! If you wish to compare two devices of different wattage or amperes and wish to know how many units of electricity they consume, you can quickly work it out with this app. Also you can calculate your energy bill by applying the rate to the units.