# EV Charging Cost Calculator

> EV charging cost calculator: estimate the cost to charge your electric car from battery size, electricity rate, and efficiency. Free, editable rates, no signup.

- **Canonical URL:** https://boringtoolskit.com/ev-charging-cost-calculator/
- **Category:** Energy & Electrical
- **Evidence level:** authored-methodology
- **Reviewed:** August 2026
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Cost = battery kWh x (charge % / 100) x (1 + loss %) x rate; cost per mile = cost / (kWh x mi/kWh).

## Worked example

A 75 kWh battery charged from 20% to 80% at $0.17/kWh with 10% losses: $8.42 per session, about $0.049 per mile at 3.5 mi/kWh.

## Assumptions

- Usable battery capacity equals the entered capacity.
- Charging loss and electricity rate remain constant.
- Taxes, demand charges, time-of-use pricing, idle fees, and public-network fees are excluded.

## Common questions

### How much does it cost to charge an EV at home?

Multiply the grid energy (battery kWh ÷ (1 − charging loss)) by your electricity rate. At $0.17/kWh with 90% efficiency, a 40 kWh charge costs about $7.56.

### Why is more energy drawn from the wall than the battery holds?

Charging is not 100% efficient; some energy is lost to heat and the charging electronics. Dividing by (1 − loss) accounts for that loss.

### Does this include public charging stations?

No — it models home charging. Public stations add their own network fees and per-minute or idle fees.

### What electricity rate should I use?

Use your own home rate in $/kWh, including any time-of-use variation if you charge when rates are lower.

## Related tools

- /electricity-cost-calculator/
- /battery-runtime-calculator/
- /watts-to-amps-calculator/

## Sources

- [Electric vehicle charging at home](https://afdc.energy.gov/fuels/electricity_charging_home.html)
- [FuelEconomy.gov electric vehicles](https://www.fueleconomy.gov/feg/evtech.shtml)

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*Local planning estimate. Verify current terms, rates, and policies before acting.*