Free tool
Slope Calculator
Percent grade, angle, and run-to-rise ratio — instantly.
Measurements
Positive = upslope, negative = downslope
Result
SiteFacts
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About this tool
The SiteFacts Slope Calculator is built for builders, estimators, and site evaluators who need fast, reliable field measurements. Calculate percent grade, angle in degrees, and run-to-rise ratio from any two elevation readings or a single change in elevation.
Two input modes: enter start and end elevations, or enter change in elevation directly. Feet and meters supported. Results are instant.
Need the full picture on a parcel before you bid?SiteFacts pulls permits, zoning, slope data, utilities, and site constraints for any property.