A painting estimate calculator is a very useful item to have and can usually be obtained from an auto paint outlet. Paint varies by manufacturer, and each manufacturer will supply their outlets with the estimated usage for that particular paint. When you are dealing direct with an online supplier, it would be advisable to supply them with the make and size of the vehicle to enable them to work it out for you. If you go into an automobile paint outlet yourself, they will usually give you a copy of the relevant manufacturer’s usage papers should you request it. Most of them are exceedingly helpful, as they hope to get your business. They will also be able to tell you what types of paint you will need for the job you envision, as well as how many coats of each to apply.