Can AI work out how much my appliance costs to run?

Yes. Give it the appliance's power rating, how long you use it and your electricity unit rate in pence per kWh. Check the conversion and assumptions against your bill and the appliance label.

What information do I need to calculate an appliance's running cost?

You need the appliance's wattage or kilowatt rating, its running time and how often you use it. You also need the electricity unit rate from your current UK tariff, and a measured kWh reading is better for appliances that cycle on and off.

Does appliance wattage tell me what it costs to run?

It gives you an estimate when combined with running time and the unit rate. It may overstate actual consumption for appliances that switch their heating or motor on and off, so an energy monitor gives a better result.

Should I include the standing charge when calculating an appliance's cost?

Usually no, if you want the extra cost caused by using one appliance. The standing charge applies to the household supply rather than to a particular appliance, so include it only for a clearly defined whole-house comparison.

YES

As of 13 August 2026, AI can calculate how much an appliance costs to run.

This still needs a person who signs their name to it.

Can you do it?

5 minutesto a draft.

15 minutesto something you’d act on.

Cost, all in£0

Skill needednone

Who has to check ityou

What the alternative costsThe supplied commercial tools list contains no purpose-built appliance running-cost calculator.

If this goes wrong: you get an inaccurate estimate because the tariff, wattage or usage assumption was wrong, and you can replace the input and recalculate.

What to actually do

Hand it to a person
The route this page recommends
A person who owns the outcome does this end to end, worth it when the failure is dear.
Do it yourself
Second choice
A chat interface, no skill needed, and roughly 15 minutes until you can act on the result.
How to actually do it
1. Open your latest electricity bill or supplier account and copy the electricity unit rate in pence per kWh, excluding the standing charge.
2. Check the appliance label, manual or manufacturer's specification and record its rated power in watts or kilowatts.
3. Write down how long the appliance runs per use and how often you use it, separating different settings or programmes if they consume different amounts.
4. If the appliance cycles on and off, plug it into a compatible energy monitor and record its measured kWh for a representative use.
5. Paste the gathered figures into the prompt, leaving any unavailable field blank so the chatbot asks for it rather than guessing.
6. Compare the chatbot's watt-to-kilowatt conversion, usage assumptions and unit rate against your notes, then recalculate one result with a calculator.
7. Use the checked cost as an estimate and update it if your tariff or appliance usage changes.
Prompt
```
Calculate the running cost of this appliance in the UK. Show every step and use kWh, not just watts.

Appliance: [name]
Rated power: [watts, or kilowatts]
Typical use: [hours and minutes per use, and uses per day or week]
Electricity unit rate: [pence per kWh]
Optional measured consumption: [kWh from a plug-in energy monitor, if available]

Give the estimated cost per use, per day, per week and per month only where the usage information supports it. State which figures are assumptions. Do not include the electricity standing charge unless I ask for a whole-house bill comparison. If the appliance cycles on and off, explain that its rated power may overstate actual consumption and use the measured consumption instead when provided. Do not invent missing figures. Ask me for any missing input before calculating.
```
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
One pick for this task
Planner 5D
Planner 5D is the closest listed home-focused AI product and has a programme, but it does not calculate appliance running costs, so a free chatbot and your bill are the practical route.
Use a tool built for this
The distant third

What it gets wrong

It cannot know your current electricity unit rate unless you provide it from your bill or supplier account.
It cannot tell from a rated wattage how much an appliance that cycles on and off actually consumes during normal use.
It cannot observe your real usage pattern, including standby time, programme choice or repeated partial loads.
It cannot replace a plug-in energy monitor when an accurate measurement matters.
It cannot include whole-house charges correctly unless you separately provide the standing charge and define what comparison you want.

Even on a YES, the friction has a name: real time truth and verification cost.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

Axis	Score (0–2)
Output	2
Inputs	2
Verification	2
Liability	2
Effort delta	2
Total	10 / 10

The methodology and its thresholds are published in full.

FAQ

Can AI work out how much my appliance costs to run?: Yes. Give it the appliance's power rating, how long you use it and your electricity unit rate in pence per kWh. Check the conversion and assumptions against your bill and the appliance label.
What information do I need to calculate an appliance's running cost?: You need the appliance's wattage or kilowatt rating, its running time and how often you use it. You also need the electricity unit rate from your current UK tariff, and a measured kWh reading is better for appliances that cycle on and off.
Does appliance wattage tell me what it costs to run?: It gives you an estimate when combined with running time and the unit rate. It may overstate actual consumption for appliances that switch their heating or motor on and off, so an energy monitor gives a better result.
Should I include the standing charge when calculating an appliance's cost?: Usually no, if you want the extra cost caused by using one appliance. The standing charge applies to the household supply rather than to a particular appliance, so include it only for a clearly defined whole-house comparison.

Nearby answers

All Energy & bills rulings

Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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Can you do it?

What to actually do

Hand it to a person

Do it yourself

How to actually do it

Prompt

Use a tool built for this

What it gets wrong

How we scored this

FAQ

Nearby answers

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