Stair Tread Size Mm

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Stair tread size mm.

The tread size min 10ins 25 4cm is dictated by the average adult foot size although it is not necessary to be able to fit your entire foot on a tread in order for walking up the stairs to be both comfortable and safe. Steep stairs make climbing more tiring and dangerous while shallow stairs are awkward and inefficient for our human stride. Standard stair tread dimensions. The riser height max 7 ins 19 7cm is limited by the way in which we come down the stairs.

Enter the length and width of your biggest foot into our size calculator. Type bar size and surface of grating type of nosing checker plate is standard width of tread. Responding to the movement of the human body the sizes and relationships of stair risers and treads are regulated to make vertical motion safe and easy. However the americans with disabilities act ada lists the minimum tread size as 11 inches which would be the effective minimum and likely the average size of the tread for any stairs built for public use.

These dimensions may be useful when laying out a staircase or if you have general questions about the size and shape of a traditional tread or a retro tread. Size min length max length max width. Length of foot mm width of foot mm calculate. Mm imperial inches metric mm imperial inches 5 157 6 3 16 64 2 1 2 n a n a 6 187 7 3 8 114 4 1 2 n a n a.

Harvard university lists typical tread sizes between 8 and 11 1 2 inches. Junior 11 12. Here is a drawing detailing our standard stair tread and riser dimensions.