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@gbj_tester
1:20 means you go up 3' for every 20yds you travel, i.e. 264' per mile. (or 5cm up for 1m along, if you insist on weird forrin measurements)
25% is 1:4
There is some debate about whether the fractional gradient is the sin or the tan of the incline angle Θ, but they are near enough the same for moderate gradients. The mathematical will use tanΘ because it makes sense, surveyors tend to use sinΘ because it's much easier to measure along the road surface than along some hypothetical horizontal plane.