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EV Charging Cost Calculator

Calculates the cost and time to charge an electric car between two states of charge, including charging losses and range added.

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In short EV Charging Cost Calculator is a free online tool on inputtesthub.com that calculates the cost and time to charge an electric car between two states of charge, including charging losses and range added. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the EV Charging Cost Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the EV Charging Cost Calculator

The EV Charging Cost Calculator calculates the cost and time to charge an electric car between two states of charge, including charging losses and range added. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Comparing home charging against a public rapid charger.
  • Working out an overnight charge on a cheap tariff.
  • Estimating cost per 100 km against petrol.

Details

Charging losses≈ 10%, more when cold
20–80% windowCharging slows above 80%
Home 7.4 kWTypical wallbox
Overnight tariffOften a third of daytime

The maths behind it

This tool uses Energy added = battery × (to − from)%. Energy drawn = that ÷ charging efficiency. Cost = energy drawn × rate. Time = energy drawn ÷ charger power. Every intermediate value is shown on screen, so the result can be checked by hand.

Roughly 10% of what the meter records never reaches the battery, which is why cost here is based on energy drawn rather than stored. Charging slows sharply above 80% to protect the cells, so on a rapid charger the last fifth can take as long as the first sixty per cent.

Explained in our guides

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Frequently asked questions

Do I need an account to use the EV Charging Cost Calculator?
There is no cost and no cap. The EV Charging Cost Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Is the EV Charging Cost Calculator safe to use with private information?
No. The EV Charging Cost Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the utility also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What formula does the EV Charging Cost Calculator use?
It uses Energy added = battery × (to − from)%. Energy drawn = that ÷ charging efficiency. Cost = energy drawn × rate. Time = energy drawn ÷ charger power. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do people use the EV Charging Cost Calculator for most?
Typical uses: comparing home charging against a public rapid charger. Working out an overnight charge on a cheap tariff. Estimating cost per 100 km against petrol. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there a catch?
Roughly 10% of what the meter records never reaches the battery, which is why cost here is based on energy drawn rather than stored. Charging slows sharply above 80% to protect the cells, so on a rapid charger the last fifth can take as long as the first sixty per cent.
What figures does the EV Charging Cost Calculator work from?
Charging losses is ≈ 10%, more when cold. 20–80% window is Charging slows above 80%. Home 7.4 kW is Typical wallbox. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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