Also, you can hit the Advanced mode button to show the slope in ratio form, and then you can input the slope ratio value (e.g., if you need a 1:8 ratio for old buildings). For example, if you want a ramp with a specific angle, just enter that value into the proper box (e.g., 5°), fill in the rise field, and the run and ramp length will be calculated for you. Moreover, our tool is even more versatile than that, as you don't need to choose from the preset applications. Just remember that for such slope, the maximum distance between landing sites is 40 ft.Īdditionally, you get some tips about landing size and ramp width. Of course, you can split it differently, depending on the space available. Useful info for two ramp runs construction:įor two ramps of equal length, each should be 23.38 ft long. Enter 35 into the rise box (or simply 5*7).Īnd that's it - our ADA ramp slope calculator will show you your results: In our case, we need to overcome five 7-inch steps. You can choose from a straight ramp, a ramp with one turn, or a ramp with a switchback. Pick the 1:16 option from a drop-down list. Let's assume that we want to comply with the ADA ramp requirements, and we'd like to make a comfortable ramp.
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Now, how to use this wheelchair ramp slope calculator?Ĭhoose the ramp's application. Use it as either an ADA ramp slope calculator to meet the government's standards, or as a tool to calculate the ramp explicitly tailored to your needs. If you're wondering how to build a ramp, our ramp calculator will be a great help in its design and construction. taking into account weather conditions if it's an outdoor ramp ( proper drainage).
edge protection and handrail extensions,. the ramp should be made out of appropriate material to prevent sliding and slipping,. the cross slope (camber) of the ramps cannot exceed 1:50,. You will find more details in paragraph 4.8.5 of the ADA Ramp Document Then the handrails are needed on both sides to comply with ADA standards. You need to provide enough space for maneuvers: if the ramp construction changes direction (a 90 degree turn), then the minimum landing size is 60"圆0":ĭon't forget to add even more space for switchback ramps. Minimum landing length is 60 in (1525 mm), and the landing's width should be at least as wide as the ramp's run. The following landing features are essential: Don't forget to take into account the mounting of handrails when designing a ramp.Įvery ramp should have level landings at the top and bottom of each section - especially if your ramp has multiple sections (turns). The minimum clear width of a ramp is 36 in (91.5 cm). When constructing a ramp, be it for your home, public space or temporary use, you need to think about a few things other than a ramp slope and rise: Inverse cosine, if you know the run and the hypotenuse: Inverse sin, if you know the rise and the hypotenuse: In this wheelchair ramp slope calculator, ramp length is the hypotenuse, but for stairs it will be the stringer length, and for roofing - the rafter length.Īlternatively, you can find the slope using inverse functions: In this case, you can calculate the run directly from Pythagorean formula: However, you might know the rise and the hypotenuse of the right triangle the ramp forms. Well, that depends what information you have - if you know the rise and run (the easiest case) then you can use the formulas mentioned above. Slope as fraction, percentage and in degreesĪfter that intro on slope units, let's come back to the heart of the matter: how do you calculate the slope of a ramp? It's calculated from the tangent of the inclination angle: Be careful - a 100% slope is not an equivalent to 90 degrees, but to 45 degrees. Giving the grade (slope) as a percentage is the most common way of describing slopes in the US and in Europe. To calculate the slope's angle, use the inverse tangent: This angle is commonly expressed in degrees, though other angle units are possible. It's the angle between ramp and run (or, in other words, angle of inclination to the horizontal). You can find the missing term of any ratio with our ratios calculator! for example, with a 1:12 ratio, for each unit of vertical rise, you need to have 12 units of horizontal run, so 1 inch of rise means that 12 inches (1 foot) of horizontal space is needed. 
It can be expressed in a few different notations: 1:8, 1/8, 1 in 8, e.g. This is the ratio of one part rise to the appropriate part of the run. You can express slope in many ways, but let's focus on the three most popular forms: Before we show you how to calculate the slope of a ramp, we first need to explain slope unit convention.
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