Vape Engine is a watt calculator for vapers. If you know resistance of your coil, but do not know how much watt do you need to vape safely; this app will help you to figure out. Simply enter the resistance of your coil and hit the calculate button. That is all you need to do. This App will suggest you the recommended watt at first. Then it will give you a watt range to choose the best watt for the best vaping experience for you.