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Ramp Calculator

Estimate horizontal run and ramp surface length from the rise and slope ratio you choose. Add level landing space to see a simple total horizontal planning length.

Geometry only, not an accessibility or code-compliance assessment. The slope and landing requirements depend on local rules, use and site conditions. This calculator does not check them or design structure. Ask a qualified professional to review the plan before building.

How do I calculate ramp length from rise and slope?

For a 1:N slope ratio, multiply the vertical rise by N to estimate horizontal run. The sloped surface is the hypotenuse of rise and run. For example, a 1 m rise at 1:12 needs 12 m of horizontal run before landings.

Frequently asked questions

How do I calculate ramp length from rise and slope?

For a 1:N slope ratio, multiply the vertical rise by N to estimate horizontal run. The sloped surface is the hypotenuse of rise and run. For example, a 1 m rise at 1:12 needs 12 m of horizontal run before landings.

Are my measurements uploaded?

No. The geometry runs locally in your browser. Your measurements are not sent to a server or saved by this tool.

Does a 1:12 ratio mean 1 foot up for every 12 feet forward?

Yes. It describes one unit of vertical rise for twelve units of horizontal run. This calculator only applies the ratio you enter; it does not decide whether that ratio is permitted or suitable.

Does this confirm a wheelchair ramp meets accessibility rules?

No. Standards vary by jurisdiction and situation, and may specify landings, width, handrails, edge protection, surfaces and other details. Check the rules that apply and consult a qualified professional.