Estimate how far your electric vehicle can travel from its battery capacity, efficiency, and current charge level.
How to Use the EV Range Calculator
Enter your EV's "Battery Capacity (kWh)".
Enter its "Efficiency (km per kWh)" - check your EV's specifications or trip computer for a real-world figure.
Enter your "Current Charge (%)".
Click "Calculate Range" to see your estimated driving range.
How the Range Estimate Is Calculated
The calculator first works out how much energy is currently stored, then multiplies it by how far your vehicle goes on each unit of energy:
Stored energy (kWh) = Battery Capacity × Current Charge ÷ 100
Estimated Range (km) = Stored energy × Efficiency (km per kWh)
The result is shown to one decimal place. It assumes the whole stored energy can be used down to 0%, so treat it as the distance to an empty battery, not to a comfortable stopping point.
Worked Example
An electric car has a 40 kWh battery, the dashboard shows 80% charge, and the trip computer has averaged 7 km per kWh over the last few weeks. Stored energy = 40 × 80 ÷ 100 = 32 kWh. Range = 32 × 7 = 224 km.
If you want to arrive with 20% left as a safety margin, only 60% of the battery is available for the trip: 40 × 0.60 × 7 = 168 km. Planning around that smaller figure is more realistic for highway journeys where chargers may be far apart.
Range of a 30 kWh Battery at Different Efficiencies
Efficiency
Same as (Wh/km)
At 100%
At 80%
At 50%
5 km/kWh
200 Wh/km
150 km
120 km
75 km
6 km/kWh
167 Wh/km
180 km
144 km
90 km
7 km/kWh
143 Wh/km
210 km
168 km
105 km
8 km/kWh
125 Wh/km
240 km
192 km
120 km
Some cars and apps report consumption in Wh/km (energy used per kilometre) instead of km per kWh. To convert, divide 1,000 by the Wh/km figure. For example, 150 Wh/km is 1,000 ÷ 150 ≈ 6.7 km per kWh. A lower Wh/km number means a more efficient vehicle.
Finding a Realistic Efficiency Figure
The certified range quoted in Indian brochures comes from a standard laboratory test cycle and is usually higher than what owners achieve on the road. Dividing that certified range by the battery capacity gives an optimistic efficiency. A figure from your own trip computer, averaged over a few hundred kilometres of normal driving, is far more reliable.
Electric scooters and motorcycles are much lighter than cars, so their efficiency in km per kWh is several times higher. If you ride a two-wheeler, use the figure from its app or dashboard rather than any car-based rule of thumb.
What Pulls Real Range Down
Speed: aerodynamic drag rises sharply above about 80 km/h, so steady highway cruising often uses more energy per km than city traffic, the opposite of a petrol car.
Air conditioning: running the AC through an Indian summer draws a steady amount of power, which matters most at low speeds and in stop-start traffic.
Load and terrain: a full car, luggage and long climbs (hill stations, ghats) all increase consumption, though some energy is recovered through regenerative braking on the way down.
Battery age: capacity slowly decreases over the years. For an older vehicle, enter a slightly lower battery capacity to reflect this.
Frequently Asked Questions
Check your EV's onboard trip computer, which usually shows an average efficiency figure, or the manufacturer's official specifications. Real-world efficiency varies with driving style, speed, terrain, and climate control use.
Factors like highway speeds, cold weather, air conditioning/heating, and carrying extra load or passengers can all reduce real-world range compared to a fixed average efficiency figure.
While charging to 100% maximizes range for a single trip, many manufacturers recommend routinely charging to around 80-90% to help preserve long-term battery health, reserving 100% charges for longer trips.
Divide 1,000 by the Wh/km value. A consumption of 125 Wh/km equals 8 km per kWh, and 200 Wh/km equals 5 km per kWh.
The certified range is measured on a fixed laboratory test cycle with moderate speeds and no real traffic, weather or AC load. Everyday driving, especially at highway speeds or with the AC running, usually uses more energy per km, so real range is lower. Use your own trip computer average for planning.