1. What is Land Grade Calculation?

Land grade calculation determines the steepness or incline of a slope, expressed as a percentage. It's commonly used in construction, landscaping, and civil engineering to assess terrain characteristics.

2. How Does the Calculator Work?

The calculator uses the grade formula:

Where:

• \( Rise \) — Vertical height difference (feet)
• \( Run \) — Horizontal distance (feet)

Explanation: The formula calculates the ratio of vertical rise to horizontal run, then converts it to a percentage by multiplying by 100.

3. Importance of Grade Calculation

Details: Accurate grade calculation is essential for proper drainage planning, road construction, accessibility compliance, and preventing erosion on sloped surfaces.

4. Using the Calculator

Tips: Enter both rise and run values in feet. Ensure run is greater than zero. The calculator will provide the grade percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is considered a steep grade?
A: Generally, grades above 10% are considered steep, while grades above 20% are very steep and may require special considerations.

Q2: How does grade percentage relate to degrees?
A: Grade percentage = tan(angle) × 100. For example, a 45° angle equals a 100% grade.

Q3: What's the maximum recommended grade for driveways?
A: Most building codes recommend a maximum grade of 12-15% for residential driveways.

Q4: How is grade used in drainage planning?
A: Proper grading ensures water flows away from structures. A minimum 2% grade is typically recommended for effective drainage.

Q5: Can I use different units of measurement?
A: The formula works with any consistent units (both rise and run must use the same units), though feet are most common in the US.