Spike's Calculators

Convert a slope percentage to an angle in degrees using the arctangent function.

Formula = atan (percentage ÷ 100)

atan (42 ÷ 100) = atan (0.42) = 22.9°

- slope percentage
- number of digits in result

- angle in radians
- angle in degrees

- Excavation Material Removal Calculator Swell and Shrinkage
- Material from a Rectangular Shaped Excavation
- Number of Truckloads - Imperial
- Number of Truckloads - Metric
- Rectangle Pyramid Pile
- Rectangle Pyramid Pile - Metric
- Volume of a Cone Shaped Pile Calculator
- Volume of a Cone Shaped Pile Calculator - Metric
- Volume of a Pile Calculator
- Volume of a Pile Calculator - Metric

- Elevation Grade Slope in a Percentage, Millimetres
- Elevation Grade from Inches per Foot
- Elevation Grade from a Percentage
- Grade Percentage to Angle in Degrees
- Horizontal Length from Angle and Slope Length
- Spike's Compaction Factor Calculator
- Shrink and Load Factor Calculator
- Swell and Load Factor Calculator
- Vertical Depth from a Slope Percentage and Horizontal Length