I'm now going to show you how to take your digital (or plain ole' pen and paper) drawing and apply a scale to it that you can use to transfer to your floor for painting. It's actually quite simple and requires very few measurements! So let's get started!
Break It Down
To start, draw a box around your design, then 'third it' length-wise so you have three long rectangle pieces. Then divide it up into 10 equal-size columns running up and down. It should look like this:
So now let's review what we've got. Instead of one large, very difficult to hand-paint design, I've got a complex pattern broken down into 30 easily manageable pieces. All I need to do now is think about my scale. I know that all three of my hallway 'pieces' are different sizes. The balcony is slightly longer than the bath/utility room hallway, and the center hallway is longer than the other two. So we know they'll all be the same 'height', some might just need to be stretched or shrunk length-wise to fit their respective hallway. Let's discuss how I plan to do that.
The Basic Math
Let's do a couple more measurements. Is one end of your hallway 168" long? Take that number and cut it in half...84" (also known as 7 feet). Why did we cut it in half? Because our design above is split down the middle. We're setting it to scale, painting it, then flipping the design to paint the other half. So the first half would be exactly 7' long, making each of your 10 columns 8.4" wide.
All About the Boxes
In the end, it'll look just like this. Congratulations, and I hope this tutorial helped you take your design and transfer it to the floor you always wanted.