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Calculate Stair Dimensions — Apply the Stair-Building 'Comfort Formula'

Beginner60 mins

Part of project

Stair Tread Sizing · Step 6 of 6

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Begin by establishing the total height of the staircase. For example, the presenter measures a total height of 1600mm. Then, determine your ideal step height (riser), which is approximately 180mm. Divide the total height by the ideal step height (e.g., 1600mm / 180mm = 8.8). Since you cannot have a fractional step, round up to the nearest whole number (e.g., 9 steps). Finally, divide the total height by the rounded number of steps to get the exact riser height for each step (e.g., 1600mm / 9 = 177.7mm).

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