1. What is Slope Percentage?

Slope percentage is a measure of the steepness or incline of a surface, expressed as a percentage. It represents the ratio of vertical rise to horizontal run multiplied by 100.

2. How Does the Calculator Work?

The calculator uses the slope percentage formula:

Where:

• \( rise \) — Vertical change (in units like meters or feet)
• \( run \) — Horizontal change (in units like meters or feet)
• \( 100 \) — Percentage conversion factor (unitless)

Explanation: The formula calculates the ratio of vertical to horizontal distance and converts it to a percentage value.

3. Importance of Slope Calculation

Details: Slope percentage is crucial in various fields including construction, civil engineering, landscaping, road design, and accessibility planning. It helps determine the steepness of ramps, roads, and other surfaces.

4. Using the Calculator

Tips: Enter the vertical rise and horizontal run measurements in the same units (meters, feet, etc.). Both values must be positive numbers, with run greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is considered a steep slope?
A: Generally, slopes above 15-20% are considered steep, while slopes above 30% are very steep and may require special construction considerations.

Q2: How does slope percentage relate to degrees?
A: Slope percentage can be converted to degrees using the formula: degrees = arctan(slope percentage/100). For example, 100% slope equals 45 degrees.

Q3: What's the maximum slope for wheelchair accessibility?
A: ADA guidelines recommend a maximum slope of 8.33% (1:12 ratio) for wheelchair ramps.

Q4: Can slope percentage be negative?
A: While mathematically possible, negative slope percentages typically indicate downward slopes and are usually expressed as positive values with direction specified.

Q5: What units should I use for rise and run?
A: Use any consistent units (meters, feet, inches, etc.) as long as both rise and run are measured in the same units.