Have you ever wondered how much your freeloading friends’ electronic recharges really cost you?

A new tool now allows you to calculate just that!

But before you start chasing them for costs, bear in mind the Charger Tariff Calculator shows just how little it costs to charge electronic devices.

The tool launched by Gocompare.com takes into account the average cost of charging smartphones, tablets and laptops from 0-100% battery life and calculates how many full charges would be needed to pay for a variety of different products.

For example, if a friend has charged their smartphone at your home 10 times, they would have racked up a bill of 3p and have 1,023 charges to go before they owe you enough for a pint of your favourite lager (£3.10) or 4,323 charges for a large takeaway pizza (£13.00).

Ben Wilson from Gocompare.com Energy said: “One topic that comes up time again with regards to saving energy and cutting down on the cost of our electricity bills is the irritation people feel when visitors charge their devices ‘free of charge’ in their homes.

“Whilst of course it is important to be frugal and ensure lights are switched off when nobody is in the room and that the TV isn’t left on stand-by, allowing a friend to charge their smartphone every time they pop over really isn’t going to break the bank.”