Slope Calculator

Convert between degrees, percent grade, and ratio (1:n) with slope length calculation — free civil engineering tool

Slope Input

Angle (°)

Conversion Results

Degrees

45.00°

Percent

100.00%

Ratio

1:1.00

tan(45.00°) = 1.000000

Grade = 100.00 / 100 = 1 / 1.00

Distance Calculator

Horizontal Distance

Vertical Rise100.000

Slope Length141.421

Slope = √(100² + 100.00²) = 141.421

Slope Diagram

run

rise

45.0°

Common Slopes

Usage	Degrees	Percent	Ratio
ADA Ramp	4.76°	8.33%	1:12
Parking Lot	1.15°	2%	1:50
Road (longitudinal)	2.86°	5%	1:20
Cut Slope (standard)	33.69°	66.7%	1:1.5
Fill Slope (standard)	26.57°	50%	1:2
Roof (4/10 pitch)	21.8°	40%	1:2.5