Slope Converter — Grade Percent to Degrees

Convert slope between grade percentage, angle in degrees and ratio (1-in-N) — for roofs, roads, ramps and trails.

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Slope / Grade Converter

Math • grade ↔ degrees

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How to Use the Slope / Grade Converter

  1. Pick a direction — use the toggle at the top (e.g. encode vs decode).
  2. Type or paste your text — the result updates live as you type; large inputs are fine.
  3. Copy the result — one click copies the output to your clipboard.
  4. Swap — flip the direction (⇄) to reverse the conversion instantly.

Why Use This Slope / Grade Converter

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Accurate Standards

Built on internationally recognised SI and standards-body conversion factors for dependable results.

Instant & Animated

Results update live as you type, with a clear visual breakdown across every unit at once.

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100% Private

Everything runs in your browser — no account, no uploads, nothing leaves your device.

Understanding the Slope / Grade Converter

Slope can be written three ways: as a grade percentage (rise ÷ run × 100), as an angle in degrees, or as a ratio (1 in N). A 100% grade equals 45°. Builders, roofers, road engineers, hikers and accessibility planners switch between them constantly.

This converter turns a grade percent into degrees and a 1-in-N ratio, and converts an angle back to grade — useful for wheelchair ramps (ADA), roof pitch, driveways and trail gradients.

Slope / Grade Converter FAQ

Angle = arctan(grade ÷ 100). A 100% grade is 45°; a 10% grade is about 5.7°.

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✔ Reviewed by the True Value Calc editorial team🗓 Last updated June 2026📚 Sources: NIST, BIPM SI unit definitions