Originally posted by surfar 59.5% larger

The FF is the crop factor one...determining how much larger means the bigger dimension must be divided by the smaller.

The sensors are rounded to the closest full number as well...i cant be bothered getting the exact dimensions...

But MF crop sensor has around 70% more area to catch light....Thats a simple explanation.

You need fairly accurate numbers - otherwise you're calculating with garbage,

If something has 70% more area, then its area is 1.7 times larger.

If area is 1.7 times as large, the linear dimensions are sqrt(1.7) = 1.3 times as large, or 30% larger.

On the other hand, if length and width is each 59.9% larger, then they are 1.599 times as large,

and the area would be (1.599)(1.599) = 2.5568 times larger, or 155.68% larger.

The numbers in your post are not even close to being consistent.