Watts to kWh Calculator

Electricity usage is a fundamental part of our daily lives, and understanding how energy is measured can help manage costs. Two key energy measurement units are watts (W) and kilowatt-hours (kWh). This guide explains what these units mean and how to convert watts to kWh effectively.

What Are Watts and Kilowatt-Hours?

• Watts (W): A watt measures power. It tells you how much energy an electrical device uses per second.
• Kilowatt-Hours (kWh): A kilowatt-hour measures energy consumption. It represents the amount of power (in kilowatts) used over time (in hours).

The Conversion Formula

To calculate energy in kWh, use this formula:

\[
\text{kWh} = \frac{\text{Watts} \times \text{Hours}}{1000}
\]

Example Calculation

1. A 100-watt bulb operates for 5 hours.

   • Multiply:
     \[
     100 \, \text{W} \times 5 \, \text{hours} = 500 \, \text{Wh}
     \]
   • Convert to kWh:
     \[
     \frac{500}{1000} = 0.5 \, \text{kWh}
     \]
     The bulb uses 0.5 kWh of energy.

2. A 2000-watt heater runs for 3 hours.

   • Multiply:
     \[
     2000 \, \text{W} \times 3 \, \text{hours} = 6000 \, \text{Wh}
     \]
   • Convert to kWh:
     \[
     \frac{6000}{1000} = 6 \, \text{kWh}
     \]
     The heater uses 6 kWh of energy.