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" 1 to 5" would most likely be 1% to 5% grade, which is giving information about how steep the hill will be. This indicates an elevation change of as little as 52.8 ft to as much as 264 ft in one mile (5280 ft).

This is slope information which has frustrated many people including me, because I did not know exactly how high and how far. Later, I found that this is a ratio and that how high and how far was irrelevant.

0% grade = 0 degree angle or flat road; 100% grade = 45 degree angle (90 degree angle is a vertical cliff or drop off).

(Rise divided by Run) times 100 or (Rise/Run) x 100 = Grade percentage

Rise = change in elevation

Run = distance

so:

100ft rise divided by 1000ft run = 0.1 times 100 = 10%

simplifying, as a ratio:

A 10% grade will have a 1 ft rise or fall in elevation for every 10 ft. (528 ft change in one mile)

A 5% grade will have a rise or fall in elevation of 0.5 ft for every 10 ft. (264 ft change in one mile)

A 1% grade will have a rise or fall in elevation of 0.1 ft for every 10 ft. 52.8 ft change in one mile)

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