Entrance step
- Input
- Desnível 0,18 m a 8,33 %
- Expected output
- 2,16 m de projeção, um único segmento
Below the 0.80 m per segment, so no intermediate landing is needed.
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wheelchair ramp slope requirements
The answer everyone repeats is 8.33 %, but on its own it is not enough: NBR 9050 pairs each slope band with a maximum rise per segment and a maximum number of segments, and that is where most designs go wrong.
Below the 0.80 m per segment, so no intermediate landing is needed.
Adding the 1.20 m landings, the total length exceeds 37 m.
Under normal conditions, 8.33 %, which is a 1:12 ratio. That is the ceiling of Table 4 and applies to new construction. In renovations, where meeting that table is demonstrably impossible, Table 5 allows up to 12.5 %, but with per-segment rises so small that in practice it only serves to overcome isolated steps.
Only in renovations, and only once the possibilities of meeting Table 4 are demonstrably exhausted. Even then, between 8.33 % and 10 % each segment climbs at most 0.20 m, with a maximum of four segments. In other words, Table 5 is not a shortcut for making the same ramp shorter; it is an exception for small rises.
For a field check, yes, provided you calibrate the device first on the bubble level. Uncalibrated, the typical fixed error of 0.3 to 1 degree corresponds to roughly 0.5 % to 1.7 % of slope, which is too much near an 8.33 % limit. For a formal report, a certified instrument and a qualified professional are required.
Rest the device flat on the ramp surface, aligned with the direction of travel, and tap Save reading. For better accuracy, calibrate the device first on the bubble level.
Tap to turn on the accelerometer. Everything is measured on your device and nothing is sent over the internet.
Values transcribed from ABNT NBR 9050:2020, corrected version of 25 January 2021, section 6.6. This tool helps check sizing and does not replace a design signed by a qualified professional or reading the full standard.
Everything is computed in your browser. No measurement, design dimension or sensor reading leaves your device.