1. What is Slope Percent to Ratio Conversion?

The slope percent to ratio conversion is a mathematical transformation that expresses slope steepness as a ratio (e.g., 1:20) instead of a percentage. This is commonly used in engineering, construction, and landscaping.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Percent \) — Slope percentage (e.g., 5%)
• \( Ratio \) — Corresponding slope ratio (e.g., 0.05 or 1:20)

Explanation: A 100% slope equals a 45-degree angle or a 1:1 ratio. The calculator converts percentage to decimal ratio and also shows the traditional "1:X" format.

3. Importance of Slope Calculation

Details: Accurate slope conversion is essential for proper drainage design, road construction, wheelchair ramp compliance (typically 1:12 or 8.33%), and landscape grading.

4. Using the Calculator

Tips: Enter the slope percentage value (e.g., 5 for 5%). The calculator will show both the decimal ratio (0.05) and traditional ratio format (1:20).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between percent and ratio slope?
A: Percent slope is rise over run multiplied by 100, while ratio slope is expressed as rise:run (e.g., 1:20 means 1 unit vertical for every 20 units horizontal).

Q2: How do you convert ratio back to percent?
A: Multiply the ratio by 100 (e.g., 0.05 ratio × 100 = 5% slope).

Q3: What's the maximum slope for a wheelchair ramp?
A: ADA recommends maximum 1:12 slope (8.33%) for wheelchair ramps.

Q4: What does a 100% slope mean?
A: A 100% slope equals a 45-degree angle where rise equals run (1:1 ratio).

Q5: How steep is a 10% slope?
A: A 10% slope equals a ratio of 0.10 or 1:10, meaning 1 unit vertical for every 10 units horizontal (approximately 5.7-degree angle).