EV Tire Battery Degradation Calculator

1. Enter usable battery capacity
Use the energy available to the driver, not necessarily the gross pack rating.

2. Add driving and efficiency
Enter annual miles and baseline miles per kWh.

3. Apply the tire penalty
Estimate the persistent efficiency reduction from the tire setup.

4. Choose period and cycle life
Set the ownership period and an assumed equivalent-cycle life to 20% capacity loss.

5. Compare modeled loss
The headline shows only the added cycle-related loss attributed to the tire penalty.

Baseline energy throughput = annual miles × years / baseline efficiency Adjusted throughput = baseline throughput / (1 − tire penalty) Equivalent cycles = energy throughput / usable battery capacity Cycle-related loss % = equivalent cycles / cycle life × 20%

The model assumes the entered cycle life corresponds to 20% capacity loss and scales linearly for comparison.

What the result means

The headline is the difference between adjusted and baseline cycle-related capacity loss over the analysis period.

Calendar aging, temperature, charging state, chemistry, and software buffers are excluded, so this should not be treated as a complete degradation forecast.

Given: 75 kWh battery, 15,000 miles per year, 3.4 mi/kWh, 6% tire penalty, five years, and 1,500-cycle life.

Calculation: Baseline throughput = 15,000 × 5 / 3.4 = 22,058.82 kWh, or 294.12 cycles. Adjusted cycles = 294.12 / 0.94 = 312.89. Baseline loss = 294.12 / 1,500 × 20% = 3.92%; adjusted loss = 4.17%.

Result: The tire penalty adds about 0.25 percentage points of modeled cycle-related capacity loss.