For the first time ever Apple is competing against Android phablet makers on handset size with the iPhone, as its 2014 models come in two sizes: the 4.7-inch iPhone 6 and 5.5-inch iPhone 6 Plus. However, screen diagonal measurements do not tell the complete story, so if you’re still not sure which model is right for you, then there’s a simple “tool” to use to quickly make your preorder decision easier.

FROM EARLIER: iPhone 6 and iPhone 6 Plus: Pricing, release dates and everything else you need to know

An AppleInsider reader has put together a simple “iPhone 6 Pre-Order Picker,” a PDF document consisting of a single page that shows simple drawings of iPhone 5s, iPhone 6 and iPhone 6 Plus. Once printed on a standard 8.5 x 11 inch printer paper at 100% scale, the “tool” will help you compare the size of your existing iPhone against the iPhone 6 models, and decide which iPhone 6 version to preorder on Friday.

Obviously, if you’re not interested in preordering the iPhone 6 and want to buy it only after a hands-on experience in stores, then you’ll have to wait until September 19th, when the iPhone 6 launches in stores.

For what it’s worth, the 4.7-inch iPhone 6 measures 138.1 x 67 x 6.9mm and weighs 129g, while the 5.5-inch iPhone 6 Plus measures 158.1 x 77.8 x 7.1mm and weighs 172g.

An image showing the “tool” in action follows below.

Chris Smith started writing about gadgets as a hobby, and before he knew it he was sharing his views on tech stuff with readers around the world. Whenever he's not writing about gadgets he miserably fails to stay away from them, although he desperately tries. But that's not necessarily a bad thing.