About the Elevation Grade Calculator Online Free Tool

The Elevation Grade Calculator Online Free Tool computes elevation change, grade percentage, and slope angle from two elevations and horizontal distance.

How to Use the Elevation Grade Calculator Online

1. Enter start and end elevations.
2. Enter horizontal distance between the two points.
3. Run the calculator to review elevation change, grade, and slope angle.

Choosing Options Correctly

Use the same vertical and horizontal units. The horizontal distance should be plan distance, not slope distance, unless that is the convention you intentionally want to approximate.

Common Use Cases

• Estimate road or path grade.
• Check site drainage slope.
• Convert elevation profiles into slope angles.

Quick FAQ

Can the grade be negative?
Yes. A lower end elevation produces a negative grade.

Does this use terrain profiles?
No. It uses only two elevations and one horizontal distance.

What units should I use?
Use the same length unit for elevation difference and horizontal distance before calculating percent, ratio, or angle.

Can I use it for road or drainage design?
Use it for quick grade checks only. Final design needs terrain, standards, drainage, and constructability review.