While doing pre-op.cardiorespiratory assessment,  physician /cardiologist generally write fit/unfit/ high risk etc. for surgery. It doesn't give any standardized information like class/% of risk involved (very much helpful to explain peri operative risk to patient/ relative). I read various Cardiac Risk Index.

Is there any risk calculator app. available like E-GFR calculator. What is your opinion regarding present way of writing fitness assessment?