EV Charging Cost Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter battery capacity, start and end charge %, your electricity rate and charger efficiency.
- Read the energy used and cost.
How it works
Battery energy = capacity × (end − start) ÷ 100; grid energy = that ÷ efficiency; cost = grid energy × rate.
Worked example
60 kWh, 20→80%, $0.30/kWh, 90%. ≈ 40 kWh from the grid → about $12.
Tips
- Estimate only.
Frequently asked questions
Why include efficiency?
Some energy is lost as heat when charging, so the grid draws a bit more than reaches the battery.
Privacy?
Runs entirely in your browser. Your inputs are not saved or transmitted.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.