a load (of something) & loads (of something) are the same. {British English informal} 1. it means "a lot (of something) , or " lots (of something)" e.g. Our department got a load of complaints about the customer service. Don't worry, I think there's loads of time 2. " amount " (of something) " - a large quantity of something that is carried by a vehicle, person etc The plane was carrying a full load of fuel. 3.Another meaning for loads (of something) = washing a quantity of clothes that are washed together in a washing machine: e.g. This morning, my mom has already done five loads of laundry. Then she feels really exhausted!

They are both informal and they are both used to mean a large amount or number of people or things; plenty of people or things. British people use 'loads of' in addition to 'load of': 'He bought loads of presents for the kids.' 'He bought a whole load of presents for the kids.'

"Loads of" and "a load of" are used exactly the same way as "lots of" and "a lot of".