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Electricity Cost & Energy Calculator

Calculate appliance power consumption and estimated electricity bills daily, monthly, and yearly.

1. Enter your numbers  →  2. Check the answer  →  3. Read the steps before you trust it

W
hrs
days
$/kWh

Estimated Electricity Consumption & Cost

Estimated Monthly Cost
$38.4

240 kWh / month

Daily Cost
$1.28

8 kWh / day

Estimated Annual Cost
$467.2

2,920 kWh / year

Step-by-Step Engineering Calculation

  1. 1Daily Consumption: 1000 W×8 h1000=8.000 kWh/day\frac{1000\text{ W} \times 8\text{ h}}{1000} = \mathbf{8.000\text{ kWh/day}} ($1.28/day)
  2. 2Monthly Consumption (30 days): 8.000 kWh×30=240.00 kWh/mo8.000\text{ kWh} \times 30 = \mathbf{240.00\text{ kWh/mo}} ($38.40/mo)
  3. 3Yearly Consumption (365 days): 8.000 kWh×365=2920.00 kWh/yr8.000\text{ kWh} \times 365 = \mathbf{2920.00\text{ kWh/yr}} ($467.20/yr)

Formula & Theory

Energy (kWh) = (Watts × Hours) / 1000 | Cost = kWh × Rate ($/kWh)

Calculates total electrical energy usage in kilowatt-hours and projects operating costs across time periods.

Variable Definitions
P:
Power (Watts (W)) – Appliance power rating
T:
Operating Hours (Hours/day) – Daily run time
Rate:
Electricity Rate ($/kWh) – Utility cost per kilowatt-hour

Worked Engineering Example

Gaming PC Power Cost

A 500W computer running 6 hours per day at $0.16 per kWh.

Inputs:
  • Power: 500 W
  • Hours/day: 6
  • Rate: $0.16/kWh
Result: Monthly: 90.00 kWh (14.40)∣Yearly:1,095kWh(14.40) | Yearly: 1,095 kWh (175.20)

Key Assumptions

  • •Flat utility rate structure without time-of-use peak surcharges.

Limitations & Safety Scope

  • •Cycling appliances (fridges, heat pumps) do not draw full rated power continuously.

Frequently Asked Questions

How much does 1000 Watts cost to run for 1 hour?

1000W running for 1 hour equals 1 kWh, which typically costs between $0.12 and $0.35 depending on your local utility tariff.

Related Calculators & Engineering Tools

kWh Calculator
Power Calculator

Educational & Reference Notice: This calculator provides technical estimates based on standard physical formulas. Actual electrical installation, protective device sizing, and conductor selection must be verified against the applicable electrical code (NEC, IEC, CEC) by a licensed electrician or qualified professional engineer.