Spike's Calculators

This calculator will calculate the drop in inches, the difference in elevation, from a slope expressed as a percentage.

Formula used : elevation change = ( percentage ÷ 100) * length

convert 20 feet to inches

20 * 12 = 240" 240 * (2 ÷ 100) = 240 * 0.02 = 4.8 = 4^{13}/_{16}"

- length in feet & inches
- required slope in a percentage
- fraction precision preset @16

- required drop in inches

- 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
- Slope Percent and Angle of the Slope - Metric
- Swell and Load Factor Calculator
- Vertical Depth from a Slope Percentage and Horizontal Length