Calculator tells you how long you should wait before driving after drinking

Every year, hundreds of people are caught drink driving the morning after a night on the booze. In 2012, 363 people were arrested for being over the limit between the hours of 6am and 8am.

Research from LV shows that 46% of drivers in the UK underestimate how long it takes for alcohol to leave the body. Furthermore, one in 30 – or 1.2 million – have driven while still over the legal limit the next day, many without realising.

There are a number of factors involved in how long it takes for the body to digest alcohol. This includes height, weight and gender. However, as a normal rule of thumb, every unit of alcohol takes around one hour to break down.

How much alcohol is in the bloodstream depends on how much you have drunk, over how long you drank it and how fast the body is at metabolising it.

While the latter is dependent person to person, a calculator has been developed to help guide people on whether or not they are safe to drive.

The Morning After is available to download from Google play and the App Store. It was created as part of a campaign to make people aware of the risks of driving after a boozy night out. It can help drivers to roughly estimate when they will be able to drive again – or work out when they need to stop drinking if they need to drive the next day.

"The calculator allows one hour for each unit of alcohol, plus an additional hour for the first drink to allow for the alcohol to enter the bloodstream. It then rounds up the calculation to the nearest half hour," developers said. "The calculator bases its calculation from the time you stop, not when you start drinking. Some people say this is over-cautious, but we'd rather be safe than sorry."

To use the calculator, just input the drinks you had the previous night and click submit.