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EV Charging Time & Cost Calculator

How long will your electric car take to charge—and how much electricity will you pay for? Enter your battery, start and target charge, charger power, and local electricity rate. The estimate updates as you type.

Published November 2, 2026 · Works offline after the page loads · No personal data required
Estimate, don't guess.Compare home AC charging with DC fast charging using transparent assumptions.

Set up your charge

Sample inputs are prefilled. Replace them with your own vehicle and tariff.

Use usable battery kWh, not gross capacity, when known.
Changing type loads editable example assumptions.
Example: 7.4 kW at home, or 150 kW at a DC station.
For AC, use the onboard charger rating. For DC, use the car's supported peak.
An editable assumption accounting for electrical and charging losses.
100% = flat-power scenario. For DC, lower it to explore taper/derating effects.

Electricity price

Use your own tariff or public charging rate. The default is an example, not a live price.

For example, 0.15 USD/kWh is only a sample.
Not including parking, idle or time-based charges.
Inputs are not sent to a server.

How the EV charging calculation works

1. Battery energy to add: usable capacity × (target % − starting %) ÷ 100. For a 60 kWh battery going from 20% to 80%, that is 36 kWh stored.

2. Electricity you pay for: stored energy ÷ charging efficiency. At 90%, a 36 kWh battery increase draws about 40 kWh from the supply.

3. Charging time: supply energy ÷ assumed average input power. That power is the lower of station power and vehicle charging limit, multiplied by your editable average-power percentage.

4. Cost: supply kWh × your entered price per kWh + any flat fee. This does not include taxes not already in your tariff, parking fees or time-based billing.

Charging time and cost: common questions

Why can actual charging be slower?

The car limits charging based on battery temperature, state of charge, onboard charger rating and its charging curve. A 150 kW charger does not mean the car receives 150 kW throughout the session. For fast charging, the average-power percentage is a user-adjustable scenario, not a prediction for a specific vehicle. Read our EV charging curves guide.

Does this calculate a real utility bill?

No. Prices vary by country, tariff, time of day and public charging network. Enter your actual electricity rate, including tax if applicable. The calculator never fetches live electricity prices.

Does a 22 kW home charger always charge at 22 kW?

No. The car's AC onboard charger and the power available from the installation can cap it—for example, an 11 kW vehicle AC limit makes 11 kW the maximum in this simplified model. See charger power versus car power.

Can I use this for a plug-in hybrid?

Yes, if you enter the usable energy capacity, compatible charger power and vehicle limit. Some PHEVs do not support DC fast charging.

References & limitations

This simplified estimator follows the relationship between energy and average charging power. It does not model a manufacturer-specific charging curve, charger sharing, idle fees, or scheduled charging. For trip planning, check your vehicle manual, charger and network billing terms.