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How to get a percentage of the range

I have a basic math question. I am trying to get a percentage of a range of numbers, and the algorithm bothers me.

Let's say I have a range from -5 to +5 , and I want to know what percentage is between the value. I know that -5 will be equivalent to 0% , and 5 will be 100% , with 0 being 50% .

I tried adding 5 to zoom in, but it just feels hacked. I would like him to feel dynamic, so that I can give him any range and work successfully.

Ex.

 percent = (5 + value) * 100 / 10

How can I determine that value should be a common case?

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1 answer
 range = top_value - bottom_value percent = (value - bottom_value) / range
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