Whether you're adding a ramp to your home entrance, porch, or doorway, measuring correctly is key to choosing the right size. This guide will show you how to measure for both full-size ramps and small threshold ramps, so you can feel confident in your purchase.
Start with Safety: Why Slope Matters
Ramps need to be long enough to provide a safe incline—not too steep.
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For wheelchairs and scooters, the ADA recommends a 1:12 slope (1 inch of rise = 12 inches of ramp).
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For walking or assisted use, a 1:8 slope may be acceptable.
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Threshold ramps can be much shorter since they only cover small rises (like a doorway or curb).
How to Measure for a Ramp
1. Measure the Vertical Rise
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Use a tape measure to find the height from the ground to the top step, porch, or entry.
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This number is called the rise (in inches).
Example: If your porch is 20" high, and you're using a 1:12 slope, you need a ramp that’s at least 20 feet long.
2. Determine Ramp Length
Use this simple guide (based on 1:12 slope):
| Vertical Rise | Recommended Ramp Length |
|---|---|
| 3 inches | 3 feet |
| 6 inches | 6 feet |
| 12 inches | 12 feet (1 full step) |
| 24 inches | 24 feet (2 steps) |
Need a shorter ramp? If it’s for occasional use or caregiver-assisted entry, some users choose a 1:10 or 1:8 slope—but only if safe to do so.
How to Measure for a Threshold Ramp
Threshold ramps are smaller and used at doorways, sliding doors, or single steps.
1. Measure the Rise
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Use a tape measure to get the vertical height from the ground to the doorframe or step.
2. Measure the Width
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Measure the width of the door or threshold area to make sure the ramp will cover the entire space.
3. Check for Obstructions
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Look for door swings, tight corners, or furniture that might affect placement.
Frequently Asked Questions
Q: What ramp length do I need for my porch?
A: Measure the rise in inches and multiply by 12. That gives you the minimum ramp length (in inches) for a safe 1:12 slope.
Q: Can I use a shorter ramp?
A: Possibly—but only if it’s caregiver-assisted or for very short rises. Safety comes first.
Q: What if I only need to clear a 1”–2” lip or step?
A: A small threshold ramp is perfect for that. They’re lightweight and easy to place.
Still Not Sure?
We’re happy to double-check your measurements and recommend a ramp. Call us at 888-413-8994 or chat with Marty, our AI assistant, anytime.
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