Calculateur d'Énergie des Appareils — Formule

How to Calculate Appliance Energy Cost

Every electrical appliance has a wattage rating that determines how much energy it uses.

Formula

Annual kWh = Wattage * Hours/Day * Days/Year / 1,000

Annual Cost = Annual kWh * Rate per kWh

Common Appliance Wattages

  • Space heater: 1,500W
  • Hair dryer: 1,200W
  • Refrigerator: 150W (average)
  • LED bulb: 10W
  • Desktop computer: 200W

    • Exemple Résolu

    A 1,500W space heater used 3 hours/day for 365 days at $0.15/kWh.

    1. Annual kWh: 1,500 * 3 * 365 / 1,000 = 1,642.5 kWh
    2. Annual cost: 1,642.5 * $0.15 = $246.38
    3. Monthly cost: $246.38 / 12 = $20.53
    4. Daily kWh: 1,500 * 3 / 1,000 = 4.5 kWh