Often it is hard to visualise what cable length is required.  

The most commonly bought cable is 5 metres in length.

It is often helpful to measure exactly what you need before placing an order thinking about whether the cable needs to reach around another car or obstacle to be plugged in, whether you prefer to back your car into the parking space or need a long trailing lead.

We supply cables from 1.8 to 30 metres in length and do not recommend extension leads.

The picture below may help you gauge how long each cable is.