# Calclating gradient

marco67
Posts:

**91**
Hi all, I hope this is the correct place to post this question.

Can someone help me with calculating gradients from modern % to the good old fashioned 1 in 4 for example.

I sat watching the Giro yesterday afternoon, now I know the Zoncolan was steep but how would 22% translate.

I'm sure I covered this in maths at school, but that was a long time ago and i'm not even sure if I was listening anyway.

cheers

marco

Ciao Marco

Can someone help me with calculating gradients from modern % to the good old fashioned 1 in 4 for example.

I sat watching the Giro yesterday afternoon, now I know the Zoncolan was steep but how would 22% translate.

I'm sure I covered this in maths at school, but that was a long time ago and i'm not even sure if I was listening anyway.

cheers

marco

Ciao Marco

Ciao Marco

0

## Posts

1,774you need to divide 100 by %. For example,

22%: 100 / 22 = 1 in 4.5

10%: 100 / 10 = 1 in 10

5%: 100 / 5 = 1 in 20

etc.

Basically 20% means "20 in 100", which is the same as "one in five".

Hopefully that makes sense, and is correct!!

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27To convert a ratio to a percentage, multiply the first number by 100, then divide it by the second number (e.g. 1 in 4 = (1 * 100) / 4 = 25%)

To convert a percentage to a ratio, divide 100 by the percentage to give the ratio. For example, 22% gives 100/22 which is 4.54, so the ratio is "1 in 4.54". You could then round it to "1 in 4.5" or "1 in 5".

91It makes sense, whether brain will function to calculate that when I hit the bottom of the hill remains to be seen.

cheers

Ciao Marco

4,733If it was 22 degrees then from tirgonometry. 1/tan22 gives 2.5 which gives 1:2.5 or 40% so I guess they meant 22% [:D]

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1,774(Also, I think you meant to write "Calcliating" for the title!!! [;)])

<font size="1">Have you ever tried pressing Alt+F4 ??</font id="size1">

128The old 1 in 4 was based on the horizontal distance so really 1 in 4 equates to 24.3 degrees in new money.

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