1. What is an Electricity Cost per Watt Calculator?

Definition: This calculator converts electricity rates from £ per kilowatt-hour (£/kWh) to £ per watt (£/watt).

Purpose: It helps consumers and businesses understand the cost of electricity at smaller power levels, useful for evaluating low-power devices and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Cost per Watt — Electricity cost in pounds per watt
• Rate — Electricity rate in pounds per kilowatt-hour

Explanation: Since 1 kilowatt = 1000 watts, we divide the rate by 1000 to get the cost per watt.

3. Importance of Cost per Watt Calculation

Details: Understanding cost per watt helps in:

• Comparing energy efficiency of appliances
• Calculating operating costs of low-power devices
• Making informed decisions about energy usage

4. Using the Calculator

Tips: Enter your current electricity rate in £/kWh (typically found on your energy bill). The rate must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: Why calculate cost per watt?
A: It's useful for understanding the cost of running small devices and comparing energy efficiency at a standardized level.

Q2: What's a typical UK electricity rate?
A: As of 2023, typical rates range from £0.20 to £0.40 per kWh, but check your latest bill for accurate numbers.

Q3: How can I use this for device cost calculations?
A: Multiply the cost per watt by the device's wattage and hours of use to estimate running costs.

Q4: Does this include standing charges?
A: No, this only calculates the unit rate. Standing charges would need to be calculated separately.

Q5: Why show 6 decimal places?
A: Since watts are much smaller than kilowatts, the values are small and need more precision to be meaningful.