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Calculator · Energy & Utilities

Electricity Cost Calculator

What your usage costs monthly and annually, including standing charges and tiers.

Read the how-to
The formula

How this number is built

bill = (peak kWh × peak rate + off-peak kWh × rate + fixed charge) × (1 + tax)
Step by step

Doing it by hand

Step 1

Take usage from twelve months of bills, not a single month.

Step 2

Read the actual rate per kWh from the bill rather than the advertised plan.

Step 3

Add the standing charge, which is payable regardless of usage.

Step 4

Split usage between peak and off-peak if you are on a time-of-use tariff.

Step 5

Project forward at a realistic price trend before signing a fixed-rate contract.

Questions

What people ask next

Is a fixed rate better?

It buys certainty, usually at a small premium. It is worth more when your usage is high and your budget is tight.

Which appliances dominate the bill?

Heating, cooling and water heating almost always. Electronics and lighting are usually a small fraction.

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