Calculate stair stringer length, stair angle, riser height, tread run, number of risers and step-by-step layout for straight metal stairs.
Click Calculate Stair Stringer to generate the step layout.
Results will appear after calculation.
What is a stair stringer? A stringer is the structural or supporting member running along the side of a staircase and supporting the treads and risers.
How is stringer length calculated? For a straight stair, the sloping length is the hypotenuse formed by the total vertical rise and horizontal run.
How many risers should a staircase have? The number depends on the floor-to-floor height and the permitted riser range under the applicable building requirements.
How is actual riser height calculated? Divide the total floor-to-floor rise by the selected whole number of risers.
How many treads are there? For a simple stair terminating at the upper floor, the tread count is commonly one less than the riser count, although landing and stair configuration can change this.
What is stair angle? It is the angle of the stair stringer relative to horizontal, calculated from total rise and total run.
Can this calculate metal stringer material? Yes. It estimates the sloping stringer length and can multiply it by the number of stringers, with optional top and bottom allowances.
Does this determine the steel section size? No. Steel channel, tube, angle or plate size must be selected from a structural design based on loads, span, supports, material properties and applicable standards.
Can this be used for fabrication? It is suitable as a preliminary dimensional layout. Fabrication drawings should include the actual tread thickness, connection details, support conditions, nosing, landing dimensions and code requirements.