Steep Slope Validator

Terrain gradient calculator and Development Permit trigger screening tool for community planners.

Data stays on your device. Nothing is sent to a server.

Site or project name Reference or transect label

Bylaw slope threshold (%)

Check your local land-use bylaw or OCP Development Permit area designation. Common thresholds: 25%, 30%.

Calculation method

Use Transect for a single point-to-point measurement such as a driveway, building pad, or specific cross-section. Use Area average for a multi-point estimate across a larger portion of the parcel.

Vertical rise

Horizontal run

Use the same units for both rise and run. Any consistent unit works — the ratio is dimensionless.

Unit converters

Degrees to grade (%) Grade (%) to degrees

Summary

Site	Transect / area	Method	Slope (%)	Angle (°)	Threshold (%)	Result

No measurements added yet. Use "Add to summary" to capture the current result.

Important. This tool is a technical screening aid for early planning review only. It does not determine compliance. Results depend on the accuracy of the source data — digital elevation models and contour maps carry inherent tolerances. Where a measurement falls within 5 percentage points of the bylaw threshold, field verification by a Qualified Professional is strongly recommended before regulatory conclusions are drawn. Final determination of slope compliance rests with the local regulatory authority. No liability is accepted for decisions based on outputs from this tool.