Business Energy Calculator UK 2026: Estimate Your Electricity & Gas Bill Quick Answer
Use our business energy calculator to estimate how much your company pays for electricity and gas each month and year.
Enter your:
electricity usage in kWh
electricity unit rate
electricity standing charge
gas usage and rates, if applicable
The calculator estimates your energy cost before any additional charges that aren’t entered.
You can then add a competing quote to see the potential annual difference.
Business energy customers aren’t protected by Ofgem’s domestic energy price cap, so the rates in your commercial contract matter.
Already know your usage? Compare business energy quotes →
Business Energy Bill Calculator
Business Energy Bill Calculator UK Estimate your monthly and annual business electricity and gas costs using your kWh usage, unit rates, standing charges and VAT.
Business type
Office Retail shop Restaurant Café / coffee shop Pub / bar Salon / clinic Warehouse / industrial Hotel / guesthouse Manufacturing / high usage Used to provide a recommendation after the calculation.
Contract status
Fixed contract Contract ending soon Out of contract / deemed rate Not sure Out-of-contract rates can be much more expensive.
VAT rate
0% 5% 20% Most businesses should check their VAT treatment with their supplier or accountant.
Months until contract ends
Already ended / out of contract 1 month 3 months 6 months 12+ months Businesses often compare quotes before renewal.
Need renewable / green energy?
No Yes Green tariffs may affect supplier choice and pricing.
Your estimated business energy bill
Monthly electricity cost
£0
Estimated monthly bill
£0
Average effective rate
0p/kWh
Potential monthly saving
£0
Enter your energy usage and rates to estimate your business energy bill.
Recommendation will appear here.
This calculator is an estimate only. Actual business energy bills vary by supplier, meter type, region, contract, usage, VAT treatment, standing charges, Climate Change Levy, pass-through charges and renewal terms.
Key Takeaways
Your business energy cost is driven primarily by consumption × unit rate , plus standing charges and other applicable costs.
Use actual kWh consumption from your bills rather than estimating from the size of your business.
Compare annual cost , not just the headline unit rate.
Standing charges can change which quote is cheaper, particularly for lower-consumption sites.
Small differences in p/kWh can become significant for high-energy users.
Business energy contracts aren’t protected by Ofgem’s domestic energy price cap.
VAT and Climate Change Levy treatment isn’t identical for every business supply.
Deemed and out-of-contract arrangements should be identified separately rather than treated as the same tariff.
A calculator estimate is useful for comparison, but your supplier’s complete quotation determines the actual contractual cost.
Contents
How Do We Work?
Our comparisons are researched and reviewed by the Compare Your Business Costs editorial team using provider information, official UK guidance and business buying criteria. See how Compare Your Business Costs works.
Authored by: Ally Cox – Business Technology & B2B Services Specialist, 10+ years’ experience.
Last updated: September 2026
How Is a Business Energy Bill Calculated? A simplified business energy bill contains several components.
Cost How It Works
Electricity usage
Electricity kWh × electricity unit rate
Gas usage
Gas kWh × gas unit rate
Standing charges
Daily charge × number of days
Climate Change Levy
Applied to qualifying business energy consumption where applicable
VAT
Depends on the supply and applicable tax treatment
Other charges
Can include contractual, metering, capacity or pass-through costs depending on the supply
Your supplier’s invoice may therefore be more complicated than:
kWh × unit rate.
But consumption, unit rates and standing charges provide a useful starting point for comparing energy costs.
For a simple electricity-only estimate (Annual electricity kWh × electricity unit rate) + (electricity standing charge × 365)
For electricity and gas Electricity consumption cost + electricity standing charge + gas consumption cost + gas standing charge
Then account for applicable:
Climate Change Levy
VAT
other charges
Convert Pence Into Pounds
If your electricity rate is 24p/kWh 24p ÷ 100 = £0.24/kWh
So 50,000 kWh × £0.24 = £12,000
Business Energy Bill Worked Example Assume a business consumes:
50,000 kWh electricity per year electricity rate: 24p/kWh
electricity standing charge: £1/day
Electricity Consumption
50,000 × £0.24 =
£12,000
Standing Charge
£1 × 365 =
£365
Subtotal
£12,000 + £365 = £12,365 per year
This is before applicable VAT, CCL and any other charges.
It works out at approximately £1,030.42 per month
before those additional costs.
This is an illustrative calculation, not a current market quotation.
What Is a Business Energy Unit Rate? The unit rate is the amount charged for each kilowatt hour (kWh) of electricity or gas consumed.
For example 25p/kWh × 10,000 kWh = £2,500
before standing charges and other applicable costs.
Where Can I Find My Unit Rate?
Check your latest business energy bill.
Look for:
unit rate
p/kWh
electricity charges
gas charges
Don’t enter the total bill value into the unit-rate field.
What Is a Business Energy Standing Charge? A standing charge is a fixed daily charge associated with maintaining the energy supply.
It is normally quoted in pence per day or £ per day.
Why Does the Standing Charge Matter?
Consider two electricity quotes.
Quote A Quote B
Unit rate
23p/kWh
24p/kWh
Standing charge
£2/day
£0.50/day
For a business using 10,000 kWh/year :
Quote A £2,300 + £730 = £3,030
Quote B: £2,400 + £182.50 = £2,582.50
Despite having the higher unit rate, Quote B is cheaper in this simplified example.
That’s why we prefer comparing estimated annual cost rather than ranking quotes by p/kWh alone.
How Does VAT Work on Business Energy? Business fuel and power is generally standard-rated for VAT , but qualifying supplies can receive different treatment.
Small quantities of fuel and power can automatically be treated as supplies for domestic use even when supplied to a business.
HMRC’s current de-minimis thresholds include:
electricity: up to 1,000 kWh per monthpiped gas: below 4,397 kWh per month
Other qualifying uses can also receive different VAT treatment.
Important 2026 Electricity VAT Change
From 1 October 2026 to 31 March 2027 , qualifying supplies of electricity in Great Britain are temporarily subject to 0% VAT .
This doesn’t mean all UK business electricity becomes VAT-free as it applies to electricity supplies that qualify for the relevant relief.
Gas hasn’t received the same temporary zero-rate change.
For calculator purposes, use the VAT treatment shown on your supplier information rather than assuming every business should select the same rate.
What Is the Climate Change Levy? The Climate Change Levy (CCL)
From 1 April 2026, the main CCL rate is:
electricity: 0.801p/kWh natural gas: 0.801p/kWh
However, exemptions and reduced rates can apply.
For example, small quantities treated as domestic use aren’t subject to the main rate, while qualifying energy-intensive businesses participating in a Climate Change Agreement can receive reductions.
Don’t automatically add CCL to every business calculation.
If you’re unsure whether it appears on your supply, check your energy bill or supplier.
How to Compare Two Business Energy Quotes Use exactly the same consumption assumptions for both quotes.
Suppose your business uses:
100,000 kWh electricity/year.
Current Contract New Quote
Unit rate
27p/kWh
24p/kWh
Standing charge
£1.20/day
£1/day
Current Contract
100,000 × £0.27 = £27,000
£1.20 × 365 = £438
£27,438
New Quote
100,000 × £0.24 = £24,000
£1 × 365 = £365
£24,365
Difference
£3,073 per year
before other applicable costs.
This is why the calculator should show the result in pounds per year , rather than promising a generic percentage saving.
What Does a 1p/kWh Difference Cost? Small differences become important as consumption increases.
For electricity or gas:
Annual Consumption Value of 1p/kWh
10,000 kWh
£100/year
25,000 kWh
£250/year
50,000 kWh
£500/year
100,000 kWh
£1,000/year
250,000 kWh
£2,500/year
500,000 kWh
£5,000/year
1,000,000 kWh
£10,000/year
But don’t ignore the standing charge to obtain a lower unit rate.
The right comparison is still total expected annual cost.
When Should You Compare Business Energy Quotes? It is worth reviewing your position when:
your existing contract is approaching its end date
you receive a renewal offer
you’re paying out-of-contract rates
you’re on a deemed energy contract
you move into new premises
your consumption changes materially
you open or close sites
your current contract allows a switch
Don’t assume every business can switch immediately.
Check the existing contract’s:
end date
termination provisions
switching window
exit charges
See Business Energy Switching Services .
How Can You Reduce a Business Energy Bill? There are two fundamentally different levers.
1. Reduce the Price You Pay
Review:
energy quotations
contract structure
unit rates
standing charges
supplier terms
broker/intermediary costs
See our Business Energy Tariff Optimisation guide.
2. Reduce the Energy You Use
Investigate:
heating and cooling
lighting
equipment
refrigeration
out-of-hours consumption
maintenance
energy monitoring
See our Commercial Energy Efficiency Strategies guide.
Price × consumption = the core commercial relationship.
Optimising both can be more effective than focusing exclusively on either.
Our View: Make the Calculator a Quote-Comparison Tool, Not a Savings Gimmick A useful business energy calculator shouldn’t tell every visitor they could save an arbitrary percentage.
It should answer three questions:
1. Roughly what is my existing energy arrangement costing?
2. Roughly what would another quotation cost at the same consumption?
3. What is the difference in pounds per year?
That gives the user something commercially useful before they enter the quote journey.
Use Annual kWh Whenever Possible Business type isn’t a reliable substitute for actual consumption.
Two restaurants can have completely different energy profiles.
Two warehouses can have completely different equipment.
Two offices can differ enormously in size, occupancy and heating.
Your own kWh data is much more useful than a generic “small business” assumption.
Our Preferred Calculation Consumption → current rates → standing charges → applicable taxes/levies → annual cost → alternative quote → annual difference.
That is also the same approach we recommend in our Business Energy Prices UK and Business Energy Contracts guides.
Business Energy Calculator FAQs How do I calculate my business electricity bill?
Multiply your electricity consumption in kWh by your unit rate, add the applicable standing charge and then account for any applicable CCL, VAT and other charges.
How do I calculate my business gas bill?
Multiply your gas consumption in kWh by the gas unit rate, add the gas standing charge and then account for applicable taxes, levies and other charges.
How do I find my annual business energy usage?
Check your latest energy bill, annual statement or supplier account. Electricity and gas consumption should be shown in kWh.
Should I enter monthly or annual energy usage?
Annual consumption is preferable where available because it captures seasonal changes. The calculator can also annualise monthly usage when only a monthly figure is available.
Are business energy prices capped?
No. Ofgem’s domestic energy price cap doesn’t protect non-domestic business energy contracts.
What is a good business electricity rate?
There isn’t one universal rate that represents a good deal for every business. Quotes vary according to consumption, location, meter, contract structure, timing and other commercial factors. Compare the total annual cost of quotations available to your business.
What is a business electricity standing charge?
It is a daily fixed charge associated with the electricity supply. Because it applies regardless of consumption, it can materially affect the total cost of a quote.
Does business energy include VAT?
Business fuel and power is generally standard-rated, but qualifying and low-consumption supplies can receive different VAT treatment. Check the treatment applicable to your supply.
What is the Climate Change Levy?
CCL is an environmental tax applied to certain business energy supplies. Exemptions and reductions apply in some circumstances.
Why doesn’t the calculator automatically assume 20% VAT?
Because not every business energy supply receives identical VAT treatment. The calculator should allow the user to apply the tax treatment relevant to their supply rather than assuming one rate universally.
Can I use the calculator to compare an energy quote?
Yes. Enter the alternative unit rates and standing charges using the same annual consumption. The calculator can then show the estimated difference between the two arrangements.
Does the cheapest unit rate mean the cheapest contract?
No. Standing charges and other contract costs can make a quote with a slightly higher unit rate cheaper overall.
Can I switch business energy supplier immediately?
It depends on your existing contractual position. Check your end date, switching terms and any exit provisions before agreeing another contract.
What information do I need to compare business energy?
Ideally have your annual electricity and gas consumption, current rates, standing charges, contract end date and MPAN/MPRN numbers available.
Know Your Cost? Now Compare the Market The calculator tells you what your current rates could cost at your consumption.
The next question is:
How does that compare with the contracts currently available to your business?
Have your latest bill ready where possible.
Compare tailored business energy quotes →
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Hi, I’m Ally Cox , a senior copywriter and blogger at CompareYourBusinessCosts.co.uk, the UK’s trusted platform for comparing business services.over a decade of experience in the B2B sector, I specialise in simplifying complex topics like leased lines, VoIP, business energy, HR and payroll solutions, accounting software, and EPOS systems .HR, copywriting, and business operations- from clocking-in systems to card machines and office technology .informed, confident decisions when choosing products and services that improve efficiency and save money.
