Construction & Materials
Ramp Slope Calculator
Use the ramp slope calculator for planning and classroom measurement checks. It is not a code-compliance determination.
Slope ratio
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- Grade
- —
- Angle
- —
- 1:12 reference run
- —
Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the ramp slope calculator solves
Use the ramp slope calculator for planning and classroom measurement checks. It is not a code-compliance determination.
Formula
How to use it
- Enter vertical rise in inches.
- Enter horizontal run in feet.
- Compare the ratio, grade, and reference run.
How to read the answer
A larger second number in 1:n means a gentler ramp.
Common mistakes and edge cases
- Do not use sloped ramp length as horizontal run.
- Landings and handrails are not included.
- This page is educational and not a permit/code review.
Worked examples
Gentle planning check
Slope ratio
1:12
Steeper short ramp
Slope ratio
1:6.67
Frequently asked questions
Is this an ADA calculator?+
No. It shows slope math and a 1:12 reference only. Real projects need current code and site review.
What is ramp run?+
Run is the horizontal distance covered by the ramp, not the sloped surface length.
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Last updated: May 15, 2026