1. What is a Percentage Grade Calculator?

Definition: This calculator determines the percentage grade (slope) based on the vertical rise and horizontal run measurements.

Purpose: It helps in construction, road design, landscaping, and other fields where slope measurement is important.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \% Grade \) — Slope percentage
• \( Rise \) — Vertical height difference (meters)
• \( Run \) — Horizontal distance (meters)

Explanation: The ratio of vertical change to horizontal change is converted to a percentage by multiplying by 100.

3. Importance of Grade Percentage Calculation

Details: Proper slope calculation ensures proper drainage, ADA compliance, structural stability, and safety in construction projects.

4. Using the Calculator

Tips: Enter the rise (vertical change) and run (horizontal distance) in meters. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's considered a steep grade?
A: Typically, grades above 10% are considered steep, while ADA requires ramps to be ≤ 8.33%.

Q2: Can I use different units?
A: Yes, as long as both rise and run use the same units (feet, meters, etc.), the percentage will be correct.

Q3: How does this relate to angle in degrees?
A: Percentage grade = tan(angle) × 100. A 45° angle equals a 100% grade.

Q4: What's a typical road grade?
A: Most highways are designed with grades ≤ 6%, while mountain roads may reach 10-12%.

Q5: How do I measure rise and run in the field?
A: Use a level and measuring tape, or modern tools like laser levels or smartphone apps.