Architect Tools

Site Work · Calculator

Elevation Grade / Slope Calculator

Calculate grade percentage, angle and 1:N ratio from rise and horizontal run.

Project inputs

Enter your project values, then press Calculate.

How this calculator works

Calculate grade percentage, angle and 1:N ratio from rise and horizontal run.

grade% = rise ÷ run × 100; angle = atan(rise/run)

How to use the Elevation Grade / Slope Calculator

1. Enter project inputs

  • Elevation change (m)
  • Horizontal run (m)

2. Review the results

  • Grade
  • Angle
  • Slope ratio
  • Slope length

3. Check the calculation

The calculator uses the following core relationship:

grade% = rise ÷ run × 100; angle = atan(rise/run)

Estimating note: Actual material quantities can vary with site conditions, detailing, product dimensions, installation method, and waste.

Elevation Grade / Slope Calculator FAQ

What does the Elevation Grade / Slope Calculator calculate?

Calculate grade percentage, angle and 1:N ratio from rise and horizontal run.

What information do I need to use the Elevation Grade / Slope Calculator?

The calculator uses inputs such as Elevation change (m), and Horizontal run (m). Use values from your drawings, measurements, product data, or project specifications.

How should I use the results from the Elevation Grade / Slope Calculator?

Use outputs such as Grade, Angle, Slope ratio, and Slope length for estimating and cross-checking. Before purchasing or construction, confirm the dimensions, units, waste factors, supplier packaging, and project specifications.