How Much Does Electricity Cost?
The cost of electricity depends on how much energy you use and the rate you pay per unit. Every appliance in your home uses power, and even small devices can add up over time.
Understanding how to calculate electricity cost helps you control bills and make smarter decisions about energy use.
The Basic Electricity Cost Formula
Electricity cost is calculated using this formula:
Cost = (Watts ÷ 1000) × Hours Used × Cost per kWh
Where:
- Watts = power of the appliance
- Hours = how long it runs
- Cost per kWh = your electricity rate
Step-by-Step Example
You run a 1000W heater for 3 hours, and your electricity rate is £0.30 per kWh.
Step 1: Convert watts to kilowatts
1000W ÷ 1000 = 1 kW
Step 2: Multiply by time
1 × 3 = 3 kWh
Step 3: Multiply by cost
3 × £0.30 = £0.90
The heater costs £0.90 to run for 3 hours.
Common Appliance Costs
Here are rough examples of typical usage:
- Kettle (3000W, 10 mins): ~£0.15
- TV (100W, 5 hours): ~£0.15
- Washing machine: ~£0.50–£1 per cycle
- Electric heater: can exceed £2 per day
High-power appliances used frequently have the biggest impact on your bill.
What Is kWh?
A kilowatt-hour (kWh) is a unit of energy.
- 1 kWh = using 1000 watts for 1 hour
This is what your electricity provider charges you for.
How to Reduce Electricity Costs
- Use energy-efficient appliances
- Turn off devices when not in use
- Reduce heating and cooling usage
- Switch to LED lighting
Small changes can lead to noticeable savings over time.
Common Mistakes to Avoid
Ignoring Standby Power
Devices left on standby still use electricity.
Using Wrong Units
Always convert watts to kilowatts before calculating.
Not Checking Your Rate
Electricity prices vary by provider and region.
Underestimating Usage Time
Appliances used daily add up quickly.
Use the Electricity Cost Calculator
To calculate appliance costs instantly, use the Electricity Cost Calculator.
You can also estimate travel costs using the Fuel Cost Calculator and plan relocation expenses with the Moving Cost Calculator.
Frequently Asked Questions
How do I calculate electricity cost?
Multiply power (kW) by hours used and your electricity rate per kWh.
What uses the most electricity?
Heating, air conditioning, and large appliances typically use the most energy.
Is electricity charged per hour?
No, it is charged per kilowatt-hour (kWh).
How can I reduce my electricity bill?
Use efficient appliances, reduce usage, and avoid leaving devices on standby.
Why is my electricity bill high?
High usage, inefficient appliances, or higher energy rates are common causes.
Conclusion
Electricity costs depend on power usage, time, and your energy rate. Understanding the formula helps you manage your energy use more effectively.
Use the Electricity Cost Calculator to quickly estimate costs and reduce unnecessary spending.