EV Charging Cost Calculator
Calculate exactly what it costs to charge your electric vehicle at home or a public DC fast-charger — enter your battery size and electricity rate.
EV Charging Cost Calculator
Battery · State of Charge · Electricity Rate
How It Works
The calculator finds the net energy needed to fill the battery from the starting state of charge to the target, then inflates that figure by the charger's efficiency loss to get the actual grid draw. Multiplying grid draw by your electricity rate gives the cost.
How to Use This Calculator
- Enter your EV's usable battery capacity in kWh (check your owner's manual or spec sheet).
- Set the current state of charge (from %) and your target charge level (to %).
- Use a preset button for a typical home L2 or DC fast-charge rate, or enter your own rate.
- Adjust charger efficiency if you know your specific charger's rating (leave at 90% if unsure).
- Click Calculate to see energy added, total grid draw, and cost.
Worked Example
Reference Table
| Charger Level | Typical Power | Add per Hour | Home Rate Est. | Public Rate Est. |
|---|---|---|---|---|
| Level 1 (120V) | 1.4 kW | ~8 km / 5 mi | $0.20/hr | Rarely offered |
| Level 2 (240V, 32A) | 7.7 kW | ~45 km / 28 mi | $1.10/hr | $1.50–$2.50/hr |
| Level 2 (240V, 48A) | 11.5 kW | ~65 km / 40 mi | $1.60/hr | $2.00–$3.00/hr |
| DC Fast (CCS/50 kW) | 50 kW | ~270 km / 170 mi | N/A | $0.28–$0.40/kWh |
| DC Fast (150 kW) | 150 kW | ~650 km / 400 mi | N/A | $0.30–$0.45/kWh |
| DC Fast (250 kW) | 250 kW | ~1000 km / 625 mi | N/A | $0.33–$0.48/kWh |
| DC Ultra (350 kW) | 350 kW | ~1500 km / 935 mi | N/A | $0.35–$0.55/kWh |
Frequently Asked Questions
Why is the grid draw higher than the energy added to the battery?
All chargers have conversion losses — AC power is converted to DC inside the car (onboard charger) and some energy is lost as heat. Home Level 2 chargers are typically 88–95% efficient; DC fast chargers bypass the onboard charger and are often 93–97% efficient from the station's perspective but cable and connector losses still apply.
How do I find my EV's usable battery capacity?
Usable capacity is usually listed in the vehicle's spec sheet or owner's manual under "Energy Storage." It is slightly less than the gross (total) capacity because manufacturers reserve a buffer at both ends to protect battery health. For example, a Nissan Leaf rated 40 kWh gross has about 38 kWh usable.
What electricity rate should I use for home charging?
Check your utility bill for the cost per kWh. US residential rates average around $0.13–$0.17/kWh, but can range from $0.09 (parts of the South) to over $0.30 (California, Hawaii). Some utilities offer a lower EV time-of-use rate for overnight charging.
Is DC fast charging worse for the battery than Level 2?
Occasional DC fast charging has minimal impact on modern batteries. Most manufacturers design cells to handle regular fast charging. Sustained daily DC fast charging at very high states of charge (above 80%) does add more thermal stress. Charging to 80% rather than 100% on fast chargers is a common best practice.
