Useful next calculations
Rates and sources
DVLA, HMRC fuel advisory rates and manufacturer-published figures. Real-world results vary by driving style.
Source: DVLA / HMRC fuel advisory rates. Check the linked guidance and any live quote before acting.
When to use this calculator
- When you need a fast estimate before making a bigger decision.
- When you want to compare a few scenarios using the same assumptions.
- When you need a clearer starting point before using a detailed quote or formal document.
- When you want to sanity-check a figure you have seen elsewhere.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Battery Capacity (kWh) | 60 |
| Full Charges Per Week | 2 |
| Electricity Price (£/kWh) | £0.24 |
| Range Per Full Charge (miles) | 200 |
For those figures the calculator returns:
- Cost per charge: £14.40
- Monthly: £124.70
- Annual: £1,497.60
- Per mile: 7.20p
Method & assumptions
This calculator estimates the cost of charging an electric vehicle based on your battery capacity (in kWh), the charge level you are starting from and aiming for, and the electricity rate you are paying in pence per kWh. A charging efficiency factor of approximately 10–15% is applied to account for energy lost as heat during the charging process, which means the energy drawn from the grid is slightly higher than the net amount stored in the battery. The calculator covers home and public charging scenarios — simply enter the appropriate rate for each. It does not account for subscription fees charged by some public charging networks, which can affect the effective cost per kWh when calculated across low-frequency sessions.
Common mistakes
- Using optimistic assumptions without testing a more cautious scenario.
- Comparing outputs from different tools without checking that the inputs match.
- Treating the result as a final quote instead of a planning estimate.
- Rounding inputs too aggressively.
What to do next
- Try at least one more scenario so you can compare a realistic range.
- Use the related calculators below to cross-check the decision from another angle.
- Write down the key outputs from your best scenarios before you decide.
- If the result surprises you, change one input at a time to isolate the driver.