I have recently come across a rather annoying mathematical problem. I am currently making a computer program that will scale text to fit inside a 5 pixels wide by 7 pixels high box.

At first it seemed easy since I was able to get the width and height of the character. For example if the characters size was 7 by 8 I could simply do this
5/7 = x (0.71428571428571428571428571428571)
7/8 = y (0.875)
Then I just say I want the image scaled by x and y which should give the character back as 5 by 7

When that wasn’t working I saw that there was an invisible box round the character that was used instead by the computer so its perceived width and height was wrong.

For example if the width counted by me is 7
And the computer thinks its 9 (No way to change this)
And I want the character to fit inside 5

I can no longer do 5/7 because it will be multiplied by 9 and I can’t do 5/9 because that will make the invisible box 5 and the actual width of the character counted by me to be smaller than 5

What maths can I use so that I can fit the character inside the 5 by 7 grid?
Thanks