The permanent ramp result in the calculator below meets most building and accessibility codes in Canada and the ADA requirements for the USA. Slope Length is the square root of Rise squared plus Run squared Angle of Inclination is the tangent of Rise devided by Run Percentage is 100 multiplied by Rise devided by Run. This is the total vertical height you need to climb in inches.
This means that for every foot you go up you will need 6 feet of ramp to get you there.
The triangle diagram will be re-drawn to scale with all dimensions marked. If the ramp measures 12 feet long and the rise is 2 feet you would divide 12 by 2 to get 6 and your ratio would be 1 to 6. The first number is always one. This will be the second number in your ratio.