1-3/16" is simple. 1.1875 or thereabouts is a pain in the **** to mentally convert though. Inches are in fractions, not tenths. Thou are simple to convert as they readily convert to a fraction or millimetre and are only used in small amounts. Someone says five thou, it's easy. Someone reels off 3.380 at you though and you have an absolute **** of a time figuring out what that translates to. Use either imperial or metric; There's no inbetween.![]()
Decimal inch to mm is a simple matter of x 25.4. How that's harder than figuring 32nds I don't know. Decimal inch is the only sane way of adding up inch dimensions on a part too, or doing trig, or machining tolerances.
Each to their own Pete. I personally just can't get on with decimal inch.What about thousandths? By definition, they are part of the decimal inch 'system'.
I merely use them as a reference which most others are familiar with, but I actually prefer to think in metric over thou. It's easier for me to mentally calculate using 1/4 of a millimetre than it is a thou, even though my preferred measuring method is imperial.
As I say, I'd use the devils own system before decimal inch.
Honestly, if anyone can still try imposing their logic after the above, I give over trying to put across a personal opinion with some of you. Talk about stubborn. 
THIS is how you should measure things:


Some people use the imperametric system when stating sizes. eg plywood 8×4x18mm![]()




