Battery Degradation Calculator
Compare current usable capacity with the original capacity, and calculate historical average loss.
Your results
Transparent by designA clearer picture starts here.
Review the example inputs, then calculate. We show the assumptions alongside your result.
Why is this an estimate?
Annual loss is a historical arithmetic average in percentage points per year, not a prediction of future degradation or a battery failure date.
Read our methodologyEVVerity estimates are informational and are not a substitute for a professional battery diagnostic or pre-purchase vehicle inspection.
See how the calculation works
Annual loss is a historical arithmetic average in percentage points per year, not a prediction of future degradation or a battery failure date.
Example: compare the same capacity definition
An original usable capacity of 60 kWh and a current usable capacity of 54 kWh imply a 6 kWh reduction, or 10%. Over five years, the simple historical average is 2 percentage points of the original capacity per year. It is not a prediction of the next five years.
Where to get useful inputs
- Use the same usable-energy boundary for both capacity values.
- Keep the date and method of the current measurement or estimate.
- If the pack was replaced, check which baseline and age interval you are comparing.
Why can annual degradation be misleading?
A simple average spreads the observed change evenly across the supplied age. It does not show when that change happened or prove that future degradation will follow the same rate.
Method and examples reviewed . Vehicle specifications carry their own source dates.
Methodology, assumptions & confidence →Translate capacity loss into your route
Original EVVerity worked scenario. Inputs are illustrative, not measured vehicle results or market prices.
- Enter original usable capacity 60 kWh, current usable capacity 54 kWh and age 5 years. The result is 10% total loss and 2 percentage points per year as a historical average.
- At fixed consumption of 18 kWh/100 km, those capacities correspond to approximately 333 km and 300 km from full to empty.
- For an 80–10% planning window, compare about 233 km and 210 km instead. Use the Range Calculator to keep the reserve explicit.
What the result helps you decide
The change relevant to this route is about 23 km within the selected charge window. It does not establish a failure date or show that each future year will lose the same capacity.
Interpret a degradation result in context →Example checked .
Keep the picture in focus
All tools →Read the relevant evidence
- EV Battery Health Tests: Methods, Reports and Limitations
- EV Battery Health Test Cost in the UK: Dated Price Examples
- EV Battery SoH Meaning: State of Health Explained
- How Much EV Battery Degradation Is Normal?
Apply this to a model
Check the model’s battery references, charging equipment and viewing checklist. Match the year and original market to the car you are considering.