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First you have to specify a size for your new arena.
For this you can arbitrarily set a value you'd have chosen or use our tool to find the size close to your own optimal one. In this case specify your number of fans, your personal expectation of your upcoming fan average mood and then execute the calculation of the recommended size. You can also set your own multiplier applied to fanclub size instead of setting average mood that gives only an indicative one.
For computing this arithmetic you can use our recomended values (based on UAMJ federation sutdy on season 35) or set your own distributions. You can input any (positive) numbers. Anycase they will be normalized in percentages that sum 100% to avoid any gross mistake.
Once your values correctly specifyed launch computing of your new arena.
For calculating these numbers in each type of seatings to aplly on your current arena you have to realize step 2 and input your current arena. Then you can compute the calculation.
We recommend you not to operate any destruction on your current arena :
In general we will operate destruction only if the stadium is heavily over-dimensioned with few prospects for growth and improved results. This can be the case if you expect many consecutive relegations from an high division.
Use your common sense to decide and take into account your prospects for future growth.