How to create a calculator for WordPress?

Help to create a calculator for WordPress. Tell me some sort of a plugin or a quick solution. Really need help!

So: There must be a selection field: 1. Armatures 2. Corners and so on When you select for example 1 option, an additional field should appear, where the reinforcement grades will already be presented, and if you select 2 option, the brands of corners will be presented.

If you don't understand. I'm sorry, I'm Russian and I don't speak English well. But I really need help.

Thanks :)