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Incline calculator

Plan ramp geometry. Use rise and horizontal run to calculate grade, angle and ramp length.

Rise (mm)Horizontal run, ramp projection (mm)

Enter dimensions in millimetres. Measure the run horizontally, not along the slope.

Units, scales and calculation method

At 1:n, model dimensions equal real dimensions divided by n. Speed is scaled proportionally. Grade uses the horizontal run; ramp length uses the Pythagorean theorem. Results use up to 8 significant digits.

Standard and narrow gauge scales follow NEM 010, with T (1:450) and 00 (1:76.2) also available. Narrow gauge variants share the parent scale ratio. For other standards, choose a custom scale (1:1 to 1:10000). An inch is 25.4 mm; a foot is 304.8 mm. Sources: MOROP NEM 010 (PDF) · T Gauge · NIST

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