Pitch Attitude in Percent Instead of Degrees

[airbusmonitorer]

I have never heard of % used in relations to pitch.
Degrees of pitch is used and on the Airbus Flight Path Angle (FPA).
% is used for climb gradients.
For mental exercise and as a rule of thumb I use 3% as a reference.
The groundspeed I divide by 3 and then multiply by 10.
For instance of a groundspeed of 240 knots, 800 fpm is required. 240/3 = 80 x 10 = 800
For 6,6% gradient 800 x 2,2 or 800 x 2 plus 10%..

Unfortunately I am not allowed to post the table (URL) until I have posted 8 posts.

Climb gradient 3%, Feet per NM 182, 120 kts GS 400 fpm, 180 kts GS 600 fpm, 240 kts GS 800 fpm.