Energy
Estimate remaining driving range from battery percentage and usable capacity.
Enter your numbers to see the answer.
EV battery percentage to range guide
The battery gauge tells you a percentage; this calculator turns it into kilometres you can actually drive. Enter the usable capacity of your pack, the state of charge shown on the dash, and your consumption in kWh per km, and it multiplies capacity by charge to find the energy on board, then divides by consumption. It is the fastest way to answer whether 43% will get you home, how far a 20% buffer really is, or how much range a friend’s car has left when the dash quotes a range you do not trust. The default 0.2 kWh/km (20 kWh/100 km, about 3.1 mi/kWh) is a fair mixed-driving figure for a mid-size EV; compact cars manage 0.15–0.17, large SUVs and trucks 0.25–0.30, and winter motorway driving can push any of them 30% higher. Pull your own consumption from the trip computer for the closest answer.
Available energy (kWh) = usable battery (kWh) × state of charge (%) ÷ 100. Range (km) = available energy (kWh) ÷ consumption (kWh/km).
Worked example: a 75 kWh usable battery at 43% with consumption of 0.2 kWh/km. Available energy = 75 × 43 ÷ 100 = 32.25 kWh. Range = 32.25 ÷ 0.2 = 161.3 km, which is what the calculator displays. In miles that is 161.3 ÷ 1.609344 ≈ 100 mi. The same 43% in a car using 0.26 kWh/km on a cold motorway run gives 32.25 ÷ 0.26 = 124.0 km, and if you want to arrive with 10% in reserve, only 33 percentage points are spendable: 75 × 0.33 ÷ 0.2 = 123.8 km.
Usable battery is in kWh (Wh and MWh are available in the unit menu); use the usable figure, not the gross figure, because the car hides a few kWh at the bottom you can never drive on. State of charge is a plain percentage from the dash. Consumption is kWh per kilometre, so divide a kWh/100 km figure by 100 (18 kWh/100 km → 0.18). For miles per kWh use 1 ÷ (mi/kWh × 1.609344), so 3.5 mi/kWh is about 0.178 kWh/km; for Wh per mile divide by 1,609, so 250 Wh/mi is about 0.155 kWh/km.
This is a modelled estimate, not a meter reading. Real consumption moves with weather, occupancy, appliance age, standing charges, and tariff structure, and equipment rarely runs at its nameplate rating. Use the figure to compare options against each other, then confirm against your own bill and the manufacturer's specification before committing to a purchase. On this page the figure rests entirely on usable battery, battery percentage, consumption, market / jurisdiction, effective date, data source, update owner and review date, so start there if the ev battery percentage to range returns something you did not expect.
Good to know: the dashboard percentage usually already excludes the hidden buffer, so pair it with the usable capacity rather than the gross number or you will overstate range by 5–10%. Do not reuse the consumption figure from a summer commute for a winter trip; check the trip computer’s recent average instead. And remember that the result is range to empty, not range to the next charger—subtract the reserve you want to arrive with, or use the trip feasibility calculator, before committing to a route.
Energy results depend on tariffs, equipment behavior, region, weather, and installation assumptions. Verify rates and electrical decisions with the utility, manufacturer, or qualified professional.
Sources
How it works
Estimate remaining driving range from battery percentage and usable capacity. This tool explains the calculation so you can adjust the assumptions to match your situation.
Worked example
With Usable battery = 75 kWh · Battery percentage = 43 % · Consumption = 0.2 kWh/km → 161.3 km (estimated remaining driving range). Change an input above and this example updates with your numbers.
Common questions
That depends on pack size and consumption. A 75 kWh usable pack at 43% holds 32.25 kWh; at 0.2 kWh/km that is about 161 km (100 miles). A 60 kWh compact at the same percentage and 0.16 kWh/km gets 60 × 0.43 ÷ 0.16 ≈ 161 km too, because smaller cars use less energy per kilometre.
Multiply the usable battery capacity by the percentage, then divide by your consumption in kWh per kilometre. For example, 64 kWh × 0.50 = 32 kWh; at 0.18 kWh/km that is 178 km. The car’s own range estimate does the same sum but uses a rolling average of recent driving, which is why it swings.
Around 0.15–0.18 kWh/km (15–18 kWh/100 km) is efficient, 0.18–0.22 is typical for family hatchbacks and crossovers, and 0.25–0.30 is normal for large SUVs and pickups. Official WLTP figures sit at the low end; real-world motorway and winter driving lands 15–30% higher.
Range on the dash is a prediction, so it falls quickly when recent driving has been fast, cold, or uphill even though the percentage is a direct measure of stored energy. Heating the cabin from cold can also pull 2–5 kW regardless of speed. Recompute with a higher consumption figure to see the effect.
Occasionally reaching 10% is fine—manufacturers keep a hidden buffer below 0%—but arriving at a charger with 10–15% gives you a margin for a broken or occupied station. Frequently sitting near 0% or 100% for long periods is what wears the pack, not a single low arrival.