Calculating the percentage when not using lambda

So I understand from watching the process of calculating the percentage through lambda but what about regular air fuel ratio readings is it change or is it different on the way you multiply it

Same equation: change = have over want. So say you have AFR = 14.2 (Lambda .966), and you want AFR 14.7 (Lambda 1.0)

The amount to change the fuel table is 14.2 / 14.7 = .966 So multiply the fuel table value by 0.966

Another example, you measure AFR 13.5, and you are targeting AFR 12.9. The change is have / want or 13.5/12.9 = 1.047. (a 4.7% increase in fuel).

Thank you so much bro