What this calculator does
EV home charging cost & time works out cost and time to charge an electric vehicle from one charge level to another. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaEnergy added = capacity × (target% − current%) / 100; cost = energy × price/kWh; time = energy / (charger power × efficiency)
The inputs explained
| Field | What to enter |
|---|---|
| Battery capacity (kWh) | A number, measured in kWh. Starts at 75. |
| Current charge (%) | A number, measured in %. Starts at 20. |
| Target charge (%) | A number, measured in %. Starts at 80. |
| Charger power (kW) | A number, measured in kW. Starts at 7.4. |
| Charging efficiency | A number. Starts at 0.9. |
| Electricity price ($/kWh) | A number, measured in your currency/kWh. Starts at 0.3. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with battery capacity
Every other input is held at the calculator’s starting values while battery capacity varies. Select any row to load that scenario into the calculator.