Robert,
Ideally, the ramp should be 1 foot per inch. So, if the porch is 
actually 39 inches off the ground, your ramp would need to be 39 feet.

At 01:39 PM 8/21/2008, you wrote:

>I need to build a small ramp from the ground up on to the porch. How 
>do I figure out the gradiant? Like the porch is 39 inches off the 
>ground, how long should the boards be? Ideally the ramp should be 
>cement but I don't know how to do that and it's frankly beyond our 
>budget to have a pro do it. So I'm thinking of building a simple 2 
>by6 over 2 by 4 ramp and bolting it to the underside of the porch 
>frame. Thoughts?
>
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