How to read your energy bill (kWh, rate, standing charge)

KiloWise editorial team · Last updated 5 November 2026 · Category: Bills & Tariffs

Your energy bill is not just a demand for payment. It is the one document that tells you exactly how much energy your home used, what you paid for each unit, and what you paid simply for being connected. Once you can read those three numbers, every other saving decision gets easier — because you can check a claim against your own bill instead of guessing.

This guide shows you how to read your energy bill step by step: what a kWh is, where your unit rate and standing charge hide, how to tell an estimated reading from an actual one, and how the same layout changes in the United States, the United Kingdom, Canada and Australia. It works for electricity bills and, with one extra line, for gas bills too.

By the end you will be able to turn a real bill into three numbers — your usage, your rate and your fixed charge — and feed them into the bill audit tool to build a ranked savings plan. No saving is promised here; the point is to give you a plan based on your own numbers, not on somebody else's averages.

What a kWh is, in plain English

A kilowatt-hour, written kWh, is the unit your supplier charges you for. One kWh is what you use when you run a 1,000-watt appliance for one hour. A 100-watt light bulb running for ten hours uses 1 kWh. A 2,000-watt kettle running for half an hour uses 1 kWh. The bigger the appliance and the longer it runs, the more kWh you use.

Your bill shows how many kWh you used in the billing period.

Where each number hides on your bill

Bills look different from supplier to supplier, but they almost always contain the same five pieces of information. Use the table below to find them, whichever country you are in.

Start with the billing period. A bill covering 32 days will naturally be higher than one covering 28 days, even if your daily use did not change. Divide your total kWh by the number of days to get your daily average — that is the fair number to compare from one bill to the next.

Next, find the meter readings. Your usage is the difference between the current reading and the previous reading. If the bill says "estimated", the supplier guessed your usage, usually from your past use. An estimated bill can be too high or too low; the difference is corrected when an actual reading is taken. If you think an estimate is far out, send your supplier a photo of your meter and ask for a corrected bill.

Your unit rate: how to find your electricity rate

Your unit rate is the price you pay for each kWh. In the United States it is usually shown in cents per kWh; in the United Kingdom in pence per kWh; in Canada and Australia in cents per kWh. It may be labelled "energy charge", "usage charge", "unit price" or simply the price next to your kWh figure.

Some bills split the rate into two parts — a supply charge and a delivery charge — and add them together. If yours does, add the two per-kWh figures together to get your true unit rate. That combined figure is the one to use when you compare tariffs or work out what a saving is worth.

For context, the US residential average was 18.19 cents per kWh for January to July 2026, according to the US Energy Information Administration, and the US average monthly bill was $144 in 2024, according to the EIA via NerdWallet. Those are national averages, not targets: your rate depends on your supplier, your tariff and where you live. In the United Kingdom, the Ofgem price cap for October to December 2026, announced on 26 August 2026, set electricity at 26.32p per kWh for default tariffs. Again, rates vary by region and supplier, so check your bill.

If your bill shows different rates for different times of day, you are on a time-of-use tariff. Note each rate and the hours it applies to — a cheap overnight rate only helps if you can shift real use into those hours. Our guide to energy tariffs explained covers fixed, variable and time-of-use tariffs in full.

The standing charge, explained

The standing charge — also called a fixed charge, customer charge, basic charge or daily supply charge — is what you pay for being connected to the network, whether you use any energy or not. It covers the cost of the wires, pipes, meters and billing, and it is charged per day in the United Kingdom, Canada and Australia, and usually per month in the United States.

Because it is fixed, it does not fall when you use less energy. That is why two households can use very different amounts of energy and still pay a similar standing charge. It also means that when you compare tariffs, you must compare both numbers: a tariff with a lower unit rate but a higher standing charge can cost more overall if your usage is low, and less if your usage is high.

In the United Kingdom, the Ofgem price cap for October to December 2026 set the electricity standing charge at 54.83p per day and the gas standing charge at 29.68p per day for default tariffs. Over a 30-day month, the electricity standing charge alone is 54.83p × 30 = £16.45. Remember that the cap is a ceiling on unit rates and standing charges for default tariffs — it is not a cap on your total bill. Your total still rises with your usage.

Estimated vs actual readings: what to check

Look for a letter or word next to each meter reading. "A" or "actual" means somebody — you, a meter reader, or a smart meter — recorded the real number. "E" or "estimated" means the supplier guessed. A smart meter usually sends actual readings automatically, so estimated bills should be rare once one is fitted and working.

Three checks are worth doing every time. First, is the current reading higher than the previous one, and by roughly the amount of kWh shown? Second, does the billing period match the dates you expect? Third, if the bill is estimated, does the estimate look plausible next to your last actual bill — roughly the same daily average, allowing for the season?

If a reading looks wrong — for example, the current reading is lower than the previous one, or your usage has doubled with no change in your home — contact your supplier before you pay, and send a photo of the meter showing the reading and the meter number. Keep the photo and the date. A wrong reading is one of the few bill problems that is usually fixed quickly once the supplier can see the meter.

Gas bills: the same idea, one extra step

Gas is often measured in cubic metres or cubic feet on the meter, then converted to kWh on the bill. Look for a line showing the conversion — it usually lists the volume used, a calorific value and a conversion factor. You do not need to do the conversion yourself: the bill should already show the final figure in kWh, and that is the number to use.

Five checks before you file the bill away

First, write down your three numbers: kWh used, unit rate, and standing charge per day or month. Second, work out your daily average kWh and compare it with last month and the same month last year — a sudden jump is worth investigating before it becomes a habit. Third, check whether the reading was actual or estimated, and send a reading if it was estimated and looks wrong.

Fourth, look at the total and ask which part moved: did you use more, or did the rate go up? That answer decides whether your next step is a home fix or a tariff check. Fifth, keep the bill. A year of bills is the cheapest energy audit there is: it shows your seasonal pattern, and it is the evidence you need if you ever dispute a charge or compare a new tariff.

Related: use your three numbers in the bill audit tool, then work through the home energy audit checklist, check standby power costs, or read our energy tariffs explained guide. You can also browse the full set of guides in our resources section.

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