Where do I locate the desired Calculator?

Look at top of the Calculator’s Form. Each Calculator is located on its own tab page.
As of this writing (summer 2020), the following 10 calculators are included:

1. A-a Gradient
2. Anion Gap & Osmolality
3. BMI, BSA, Lean Wt & BMR
4. Body Weights
5. Cardiac Risk
6. Est. Avg. Glucose
7. Fibrosis-4
8. GFR
9. MEDD Calculator
10. PSA Velocity