What this is for
You are responsible for the volume. The pages start quiet and cap their own slider, and that is not a guarantee. Do not use binaural tones while driving. Do not treat any page as a medical hearing test or as a certified measurement of a product.
How to use the result
Calculators show a formula and a result for the numbers you type. They do not know your interface’s calibration. Speaker diagrams are geometry, not a room correction.