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EV Charging Cost Calculator

Last updated: April 2026

Your EV

1 mile = 1.609km. UK average mileage is about 12,000km, or 7,400 miles, per year.

Charging mix

Total: 100%

Charging rates

Annual cost headline

Annual charging cost

£753

Cost per mile

10.1p/mile

Cost per 100km

£6.28

Charging method breakdown

Method%kWh/yrCost/yrp/kWh
Home70%1,867 kWh£45724.5p
Workplace10%267 kWh£00p
Public AC10%267 kWh£10439p
Public DC8%213 kWh£14970p
Ultra-rapid2%53 kWh£4380p
TOTAL100%2,667 kWh£753-

Vs petrol comparison

Your EV cost10.1p/mile
Equivalent petrol (40mpg, 145p/litre)16.5p/mile
Annual saving vs petrol£475

Home charging optimisation

Switch to Octopus Go or a similar EV tariff for overnight charging.

Current home rate: 24.5p/kWh

Octopus Go rate: about 9p/kWh overnight

Annual saving from switching: £289

Charging speed guide

7kW home wallbox

Adds about 30 miles per hour

22kW public AC

Adds about 80 miles per hour

50kW rapid

Adds about 100 miles in 30 minutes

150kW+ ultra-rapid

Adds about 100 miles in 10 minutes

EV chargepoint grant

Homeowners and renters in flats may be eligible for the OZEV Electric Vehicle Chargepoint Grant, worth GBP350 off a home wallbox. It is only available through OZEV-approved installers.

How much does it cost to charge an EV at home?

Charging at home on a standard tariff costs approximately 24.5p per kWh. A 60kWh battery providing roughly 300km of range costs about GBP14.70 to charge from empty. On a dedicated EV tariff like Octopus Go, overnight charging at around 9p/kWh reduces this to about GBP5.40.

How much do public chargers cost?

Public charging costs vary significantly. Slow and fast AC chargers typically charge 30-50p per kWh. Rapid DC chargers charge 60-85p per kWh. Ultra-rapid chargers can reach 80-99p per kWh, so rapid public charging can approach the cost of petrol per mile.

What is the OZEV chargepoint grant?

The Office for Zero Emission Vehicles offers a GBP350 grant toward the cost of installing a home EV chargepoint. The grant is available to homeowners, renters in flats, and people in rented accommodation, and must be claimed through an OZEV-approved installer.

About this calculator

The EV Charging Cost Calculator estimates the cost of charging an electric vehicle at home, work, or public chargers. It converts battery size, state of charge, charger losses, and electricity price into cost per charge and cost per mile. Use this expanded guide when you need more than a quick result. It explains the assumptions behind the EV Charging Cost Calculator, the records to gather, and the decisions the estimate can support. It is especially useful for EV drivers estimating home, work, destination, or public charging costs and converting them into cost per mile. The strongest use of the page is scenario comparison: change one input at a time, compare the output, and keep a note of which assumption changed.

EV charging cost method

Charging cost is based on the energy added to the battery, adjusted for charging efficiency, multiplied by the electricity price. The calculator result depends on the quality of the inputs and on the rule set or formula selected in the calculator above. For practical use, treat the output as a structured estimate: start with the core inputs, review the main outputs, then test the decision points that matter most to your situation. Key decisions include how much one charge costs, whether off-peak tariffs are worthwhile, how charging losses affect real cost.

  • energy added = battery capacity x change in state of charge
  • grid energy used = energy added / charging efficiency
  • charge cost = grid energy used x price per kWh
  • better estimate = accurate inputs + correct rule set + realistic assumptions
  • scenario difference = revised result - original result

How to use the EV charging calculator

  1. Enter battery capacity or energy to add.
  2. Enter starting and target state of charge if available.
  3. Enter electricity price per kWh.
  4. Add charging efficiency or losses.
  5. Review cost per charge, cost per mile, and monthly charging cost.
  6. Gather the main inputs first: battery capacity, start and target state of charge, electricity price.
  7. Check supporting records such as tariff details and charger receipts before relying on a final number.
  8. Enter one realistic scenario first, using conservative assumptions where the future is uncertain.
  9. Review the main outputs: energy added, grid energy used, cost per charge.
  10. Run at least one alternative scenario so you can see which input changes the answer most.
  11. Compare the result with electricity tariff and charger network pricing information or the relevant contract, bill, statement, or professional document.
  12. Keep the calculation date and assumptions with your notes so you can revisit the estimate when rates, rules, or circumstances change.

Worked example

Home charge

Input: Add 40kWh, charging efficiency 90%, electricity 12p/kWh

Calculation: 40 / 0.90 = 44.44kWh from grid; 44.44 x GBP0.12

Result: Estimated charging cost is about GBP5.33.

Off-peak home charge

Input: A driver adds 45kWh overnight at a low tariff with 90% efficiency.

Calculation: Grid energy is 45 / 0.90, then multiplied by the tariff.

Result: The calculator shows the real wall-to-battery cost.

Public charging session

Input: A rapid charger has a higher kWh price and a small session fee.

Calculation: Energy cost and fixed fee are added.

Result: The cost per mile can be much higher than home charging.

Why charger losses matter

The energy drawn from the wall is usually higher than the energy stored in the battery. Losses vary by charger, battery temperature, charge speed, and vehicle systems running during charging.

What to check before relying on the result

A useful EV Charging Cost Calculator result starts with the same evidence you would use if you were checking the answer manually. The calculator can organise the arithmetic, but it cannot know whether a payslip is final, a bill is estimated, a quote excludes fees, or a personal circumstance has changed since the last statement.

Before making a decision, compare the calculator result with the source document that controls the real outcome. For this topic, that usually means checking electricity tariff and charger network pricing information. If there is a difference between the calculator and an official statement, contract, assessment, or professional advice, treat the official document as the stronger source.

tariff details
Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
charger receipts
Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
vehicle efficiency data
Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.
battery usable capacity
Use this as supporting evidence for the calculation. If it is out of date, estimated, or based on a different period, the calculator output may look precise while still being wrong for the decision.

Inputs that usually change the answer

The most important input is not always the largest number on the form. Sometimes a date, threshold, percentage, eligibility flag, or timing assumption changes the result more than the headline amount. This is why scenario testing is more useful than a single calculation.

InputWhy it mattersWhat to double-check
battery capacityIt feeds directly into the estimate or changes which rule is applied.Check the period, units, eligibility, and whether the figure is final or estimated.
start and target state of chargeIt feeds directly into the estimate or changes which rule is applied.Check the period, units, eligibility, and whether the figure is final or estimated.
electricity priceIt feeds directly into the estimate or changes which rule is applied.Check the period, units, eligibility, and whether the figure is final or estimated.
charging efficiencyIt feeds directly into the estimate or changes which rule is applied.Check the period, units, eligibility, and whether the figure is final or estimated.
vehicle efficiencyIt feeds directly into the estimate or changes which rule is applied.Check the period, units, eligibility, and whether the figure is final or estimated.

How to interpret the output

The output should be read as a decision aid, not just a number. For EV Charging Cost Calculator, the useful question is often what the result means for timing, affordability, eligibility, comparison, or next steps.

energy added
Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
grid energy used
Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
cost per charge
Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.
cost per mile
Use this output alongside the other results rather than in isolation. A monthly amount, percentage, date, or payback figure can look acceptable until fees, timing, evidence, or eligibility conditions are added.

Scenarios worth comparing

A single estimate is a snapshot. A better approach is to save a base case, then adjust one assumption at a time. This shows whether the result is stable or whether a small change in timing, rate, usage, income, or cost creates a very different answer.

ScenarioChange one assumptionWhat the comparison shows
Base caseUse the best current evidence.Shows the result you would expect if nothing important changes.
Conservative caseUse lower income, higher cost, slower growth, or less favourable timing.Shows whether the decision still works with less optimistic assumptions.
Improved caseUse the realistic upside, such as lower cost, better rate, higher usage, or stronger evidence.Shows the potential benefit without treating it as guaranteed.

Common mistakes and edge cases

Most errors come from using the right formula with the wrong assumption. Dates can be counted differently, rates can change, official thresholds can move, and real bills or contracts often include conditions that a simple calculator cannot infer automatically.

Charging losses mean wall energy exceeds battery energy.
Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Public chargers may add idle or connection fees.
Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Usable battery capacity can differ from headline capacity.
Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.
Very fast charging can be less efficient.
Check this point before using the estimate for a payment, claim, purchase, application, employment decision, or health-related decision.

Next steps after calculating

Once you have a result, write down the key assumptions and compare them with electricity tariff and charger network pricing information. If the number affects a deadline, tax return, benefit claim, employment issue, medical question, finance agreement, or major purchase, use the calculator as preparation for a more formal check.

For lower-stakes use, the next step may simply be comparing two or three scenarios. For higher-stakes use, the next step should be checking the official guidance, speaking to the relevant organisation, or getting qualified advice before acting.

Important edge cases

  • Charging losses mean wall energy exceeds battery energy.
  • Public chargers may add idle or connection fees.
  • Usable battery capacity can differ from headline capacity.
  • Very fast charging can be less efficient.

Limitations

This calculator is an estimate only and is not energy or vehicle advice. This is general vehicle-cost information and not financial advice. The calculator is designed to support understanding and planning, but it cannot verify documents, predict future rule changes, or account for every exception. Use it as an estimate and check the official source before acting where the result matters.

  • Public chargers may include connection fees, parking fees, or idle fees.
  • Charging losses vary.
  • Battery usable capacity can differ from advertised gross capacity.
  • Check electricity tariff and charger network pricing information for current rules, rates, definitions, and eligibility where relevant.
  • Do not rely on a single scenario where income, costs, dates, rates, usage, or health circumstances may change.
  • Keep records of the inputs used so that the estimate can be reviewed later.

Frequently asked questions

Is home charging cheaper?

Often yes, especially on off-peak tariffs, but it depends on your electricity rate.

Why is cost per mile useful?

It lets you compare EV running cost with petrol, diesel, or another EV.

Should I include charging losses?

Yes. Losses make the grid energy used higher than the battery energy added.

What is state of charge?

It is the battery percentage at the start or end of charging.

Why does my charger app show a different cost?

Apps may include fees, VAT, discounts, idle charges, or exact metered energy.

Can solar charging be entered?

Use an effective electricity cost or lost export value if charging from home solar.

Related calculators

  • EV vs Petrol Cost Calculator
  • Electricity Cost Calculator
  • Energy Bill Calculator
  • Solar Panel Payback Calculator

What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.

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