I have a formula which is used to calculate certain scores. The formula has some parameters (shown in the image below) including a Weight parameter that is changed dynamically (the rest of the inputs are not relevant right now). The sum of weight needs to be 100, like a pie chart.
I feel that this is not quite obvious enough for the the user but I have been unable to find any best practice to follow in this situation. Maybe I need to visualize the weight values somehow, but I'm not sure how.
How can this be enhanced or changed to be more understandable? Do you know of any well executed examples (or customized UI controls) for this kind of data and behaviour?