Real-World Range Estimator

Don't trust the dashboard guess-o-meter. Calculate your true range based on usage patterns.

Last Updated: January 2026

Inputs

Total Battery Capacity

kWh

Usable Battery % (Degradation Buffer)

New cars are ~95-98%. Older cars may be 85-90%.

Vehicle Efficiency

Safety Reserve % (Don't use)

Conditions Penalty (Speed/Weather)

Ideal (0%) 0% Severe (40%)

Current SOC (Optional)

Enter current % to see remaining range.

Range Results

Max Usable Range (100% -> 0%) -

Safe Range (leaving 10% reserve) -

Range at Current SOC -

Est. Real Efficiency -

How it Works

The calculator determines range by calculating the net usable energy in the battery and dividing it by your efficiency (adjusted for conditions).

The Formula

Effective kWh = Capacity × Usable% × (1 - Reserve%)

Real Efficiency = Rated Efficiency × (1 + Penalty%)

Range = Effective kWh / Real Efficiency

Frequently Asked Questions

Why deduct "Usable Battery %"?

Manufacturers often buffer the top and bottom of the battery. An 80 kWh pack might only have 75 kWh usable. Also, as batteries age, their capacity degrades.

What is a good reserve?

We recommend planning to arrive with at least 10% charge. This protects you from unexpected detours, broken chargers, or extreme weather.