EV Range and Charging Cost Calculator
Estimate EV range from battery size and kWh/100 km consumption, then calculate charging cost from your electricity rate. Useful for trip planning and TCO comparison.
Last updated: May 2026
Enter battery size, consumption, and electricity rate to see range and cost per kilometre.
Quick reference
| Battery | Consumption | Range |
|---|---|---|
| 60 kWh | 150 Wh/km | 400 km |
| 77 kWh | 180 Wh/km | 428 km |
| 84 kWh | 170 Wh/km | 494 km |
| 100 kWh | 200 Wh/km | 500 km |
WLTP range vs real-world range
The official WLTP test cycle is measured at 23°C with no heating or air conditioning, on a mix of urban and motorway speeds. Real driving diverges from this in predictable ways.
| Condition | Typical range impact | Example (500 km WLTP) |
|---|---|---|
| Motorway 120-130 km/h | -20 to -30% | 350-400 km real range |
| Winter, 0°C, cabin heat on | -30 to -40% | 300-350 km real range |
| Winter motorway combined | -40 to -50% | 250-300 km real range |
| City / stop-start in summer | +5 to +15% | 525-575 km real range |
| Motorway 100 km/h | -10 to -15% | 425-450 km real range |
For planning: apply a 25-30% haircut to the WLTP figure for motorway driving. Battery state-of-health also reduces range by roughly 2-3% per year for most lithium packs after the first few years.
Turning a charge into a real cost per kilometre
Every number in the EV running-cost chain converts into the next. The sequence from your home installation through to a specific journey goes like this:
- Know your home charge rate before doing the cost maths. Charger power determines how many kWh you add per hour, which feeds directly into your per-km cost. The home charger planner checks what your installation can support.
- Find out how long a charge takes. The charging time calculator turns charger power and battery size into a session duration, including the taper above 80%.
- Price the charge session. kWh added multiplied by your rate. The charging cost calculator works this out for any start-to-target window.
- You are here: convert that charge into cost per kilometre. Energy per 100 km times your rate gives the per-km figure you can hold directly against a fuel price. Enter the kWh/100 km your car actually shows on its energy screen, not the optimistic WLTP figure, and the result reflects how you actually drive.
- Compare against petrol over a full year. The EV vs petrol calculator uses your annual distance, tariff, and pump price to show the yearly saving.
- Check a specific trip. The trip planner tells you whether the range covers the route or a charge stop is needed.
- Bring the electricity cost closer to zero with rooftop solar. When the rate input in this calculator drops because you generate your own power, the cost-per-km figure falls with it. The solar panels for EV charging calculator sizes an array against your daily kilometres.
Frequently Asked Questions
How does this calculator estimate range?
It divides available battery energy by consumption: range = battery kWh × 1000 ÷ Wh/km. For a 77 kWh battery at 180 Wh/km: 77,000 ÷ 180 = 428 km. This is a ceiling estimate under ideal conditions, not a guaranteed distance.
Why is my real range lower than the WLTP figure?
WLTP is tested at 23°C with no climate control, at moderate speeds. Motorway speeds at 130 km/h typically cut range by 25-30%. Winter temperatures of 0°C with cabin heating cut it by 30-40%. The derating table above gives you planning numbers for common conditions.
My energy screen shows kWh/100 km, not Wh/km. How do I enter that?
Multiply the kWh/100 km figure by 10 to get Wh/km: 18 kWh/100 km becomes 180 Wh/km. Use the number from your car's own trip energy screen for the current period rather than the WLTP specification sheet. The on-board reading already reflects your speed, climate, and tyre choice, so the cost-per-km result lands much closer to what you actually spend.