Appliance Energy Cost Calculator

Appliance Energy Cost is evaluated from Appliance, Custom Wattage and Hours Used per Day. The calculation reports Daily Energy Use, Annual Energy Use and Daily Electricity Cost.

Results

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About the Appliance Energy Cost Calculator

Appliance Energy Cost is treated here as a quantitative relation between Appliance, Custom Wattage, Hours Used per Day and Days Used per Year and Daily Energy Use, Annual Energy Use, Daily Electricity Cost and Annual Electricity Cost.

The calculator uses a multi formula configuration. Each reported value is read as a direct evaluation of the stored rules with the declared field formats and units.

Formula basis:
Daily kWh = watts / 1,000 x hours per day
Annual kWh = daily kWh x days per year
Annual cost = annual kWh x electricity rate ($/kWh)

Interpret the outputs in the order shown by the result fields. Optional inputs affect only the outputs that depend on those variables.

Formula & How It Works

The calculation applies the following relations exactly as recorded in the metadata:

Daily kWh = watts / 1,000 x hours per day
Annual kWh = daily kWh x days per year
Annual cost = annual kWh x electricity rate ($/kWh)

Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.

Worked Examples

Example 1: Central AC: 5,000W, 8 hrs/day, 120 days/year (summer), $0.16/kWh

Inputs

appliance_type: 5000 custom_watts: 0 hours_day: 8 days_year: 120 elec_rate: 0.16
Daily Energy Use: 40 kWh/day. Annual Energy Use: 4,800 kWh/year. Daily Electricity Cost: $6.4/day. Annual Electricity Cost: $768/year

With Appliance = 5,000, Custom Wattage = 0, Hours Used per Day = 8 and Days Used per Year = 120 as the stated inputs, the result is Daily Energy Use = 40 kWh/day, Annual Energy Use = 4,800 kWh/year and Daily Electricity Cost = $6.4/day. Each value corresponds to the declared output fields.

Example 2: Electric dryer: 3,000W, 1.5 hrs/day, 150 days/year, $0.16/kWh

Inputs

appliance_type: 3000 custom_watts: 0 hours_day: 1.5 days_year: 150 elec_rate: 0.16
Daily Energy Use: 4.5 kWh/day. Annual Energy Use: 675 kWh/year. Daily Electricity Cost: $0.72/day. Annual Electricity Cost: $108/year

With Appliance = 3,000, Custom Wattage = 0, Hours Used per Day = 1.5 and Days Used per Year = 150 as the stated inputs, the result is Daily Energy Use = 4.5 kWh/day, Annual Energy Use = 675 kWh/year and Daily Electricity Cost = $0.72/day. Each value corresponds to the declared output fields.

Example 3: Old refrigerator (500W avg) vs. new ENERGY STAR (150W), 24/7/365, $0.16/kWh

Inputs

appliance_type: 500 custom_watts: 0 hours_day: 24 days_year: 365 elec_rate: 0.16
Daily Energy Use: 12 kWh/day. Annual Energy Use: 4,380 kWh/year. Daily Electricity Cost: $1.92/day. Annual Electricity Cost: $700.8/year

With Appliance = 500, Custom Wattage = 0, Hours Used per Day = 24 and Days Used per Year = 365 as the stated inputs, the result is Daily Energy Use = 12 kWh/day, Annual Energy Use = 4,380 kWh/year and Daily Electricity Cost = $1.92/day. Each value corresponds to the declared output fields.

Example 4: EV Level 2 charger: 7,200W, 2 hrs/night, 300 days/year, $0.13/kWh (Texas)

Inputs

appliance_type: 7200 custom_watts: 0 hours_day: 2 days_year: 300 elec_rate: 0.13
Daily Energy Use: 14.4 kWh/day. Annual Energy Use: 4,320 kWh/year. Daily Electricity Cost: $1.872/day. Annual Electricity Cost: $561.6/year

With Appliance = 7,200, Custom Wattage = 0, Hours Used per Day = 2 and Days Used per Year = 300 as the stated inputs, the result is Daily Energy Use = 14.4 kWh/day, Annual Energy Use = 4,320 kWh/year and Daily Electricity Cost = $1.872/day. Each value corresponds to the declared output fields.

Common Use Cases

  • Calculate the electricity cost of running a specific appliance
  • Compare energy costs of different appliances
  • Identify high-cost appliances to reduce energy bills