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Ramp Grade Calculator

Formula

To calculate the ramp grade:

$\text{Grade} (\%) = \left( \frac{\text{Rise}}{\text{Run}} \right) \times 100$

Where:

$\text{Rise}$ is the vertical height of the ramp (inches)
$\text{Run}$ is the horizontal length of the ramp (inches)
$\text{Grade}$ is the slope of the ramp expressed as a percentage (\%)

What is a Ramp Grade?

A ramp grade is a measure of the steepness or incline of a ramp. It is expressed as a percentage that represents the ratio of the vertical rise to the horizontal run. This measurement is important for ensuring that ramps are built to standards that make them safe and accessible, especially for wheelchair users and others with mobility challenges.

Example Calculation 1

Let's assume the following values:

Vertical Height ( $\text{Rise}$ ) = 6 inches
Horizontal Length ( $\text{Run}$ ) = 72 inches

Using the formula:

Step 1: Divide the rise by the run and multiply by 100:

$\text{Grade} = \left( \frac{6}{72} \right) \times 100 = 8.33\%$

The ramp grade is 8.33%.

Example Calculation 2

Let's assume the following values:

Vertical Height ( $\text{Rise}$ ) = 12 inches
Horizontal Length ( $\text{Run}$ ) = 144 inches

Using the formula:

Step 1: Divide the rise by the run and multiply by 100:

$\text{Grade} = \left( \frac{12}{144} \right) \times 100 = 8.33\%$

The ramp grade is 8.33%.