Ramp Gradient Calculator
Work out a ramp's gradient from its rise and run, and whether it meets the accessible standard. Enter the height to climb and the length available, the calculator returns the ratio and checks it against AS1428.1 (1:14).
How we estimate this
A ramp's gradient is the ratio of its rise (height) to its run (length), written as 1:X. Australian accessible ramps under AS1428.1 must generally be no steeper than 1:14, with landings at least every 9 metres and at any change of direction.
Pricing reviewed: November 2026.
Pricing reviewed November 2026. Indicative Australian costs, not a quote.
Understanding ramp gradients in Australia
A ramp's gradient is the ratio of its rise (height) to its run (length), written as 1:X. Australian accessible ramps under AS1428.1 must generally be no steeper than 1:14, with landings at least every 9 metres and at any change of direction.
If a 1:14 ramp will not fit the available space, the options are a longer ramp with landings, a step ramp (up to 1:10 for a rise of 190mm or less), or a platform lift. A building surveyor confirms what is compliant for the use and the building class.
Frequently asked questions
What is the maximum ramp gradient in Australia?
For an accessible ramp under AS1428.1, generally 1:14, with landings at least every 9 metres and at changes of direction. Short step ramps can be up to 1:10 for a rise of 190mm or less.
How long does a wheelchair ramp need to be?
At 1:14, you need 14 units of length for every 1 unit of rise, so a 600mm rise needs about 8.4 metres of ramp plus landings. Enter your rise to see the run required.
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