# Concrete stair calculator

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## Instructions

This is to instruct you on how to calculate staircase concrete quantity.

Fig. 1 General drawing of the concrete staircase: Type 1

Fig. 2 General drawing of the concrete staircase: Type 2

• Y – the height of the opening (total rise) – usually determined by the distance between the floors in your house.
• X – width of the opening (total run) – depends on how much space you can allocate in your house for the staircase.
• W – staircase width.
• A – landing length.
• B – landing thickness.
• Z – additional staircase thickness.
• F – stair nosing – a distance at which the upper step will hang over the lower one.
• G – single stair thickness.
• D – rebar diameter.
• R – amount of rebar per step.
• C – number of steps – is about how many steps your staircase will have (we encourage you to play around with this parameter to determine the best comfort index).

Fig. 3  Examples of even distribution of six and four rebar rods.

It is important to evenly distribute the rebar rods (see Fig. 3 above).

### Function “Drawing in black and white”

Fig. 4 Black and white drawing of the staircase

This function is normally used for printing in greyscale.

### What for is this calculator?

Helps to construct your staircase in a more precise manner

1. Information required for construction of stairs.
2. Information on amount of concrete you will need.
3. Information on rebar quantity you will need.

So if you ask how to calculate staircase concrete quantity, the answer is already there, in results of the calculation.

All other drawings show the final form of the staircase.

Helps to determine how comfortable your staircase will be

Every calculator on this website will allow you to:

1. Assess convenience of your staircase design;
2. Adjust the staircase parameters given the suggestions you will get.

The assessment of the staircase convenience is carried out according to the three criteria:

1. Correspondence of the staircase to the average human step length. According to this criterion, sum of a step (tread) width and two step rises should be equal to the average human step length, which is 63 cm.
2. Step (stair tread) width is important. A comfortable step width, which equals to step run + step nosing, is about 28 cm. You can regulate the step width by changing the nosing.
3. The stair angle (slope) is crucial. The optimum angle ranges from 30° to 40°. If instead stair angles range from 20° to 30° and from 40° to 45°, the level of comfort will be significantly reduced. Such angles beyond/above the optimal limits can significantly affect the speed of movement and the level of safety of the stairs.

After you fill-in the initial parameters and press “Calculate”, an indicator of the level of convenience for each criterion will be given. Furthermore, general level of convenience is calculated.

Every stair calculator on perpendicular.pro will give you practical advice on how to improve the level of comfort of your staircase. The following will be suggested:

1. Decrease / increase number of steps;
2. Increase the step width (in case if the depth of the steps is not sufficient for comfortable walking);
3. Decrease / increase the length of the opening (total run).

Usually the height of the opening is already set. Based on your own preferences, you can choose the level of convenience: either the criteria of convenience are met, or the stairs are flatter, or steeper, etc.

Although the calculator evaluates whether the staircase meets common criteria of convenience, you should always remember that your staircase should serve your purposes. Thus, if you really need to build the most non – standard staircase in the world, then go for it!

Maybe you are looking for a different staircase type?

perpendicular.pro has more to offer:

Calculators of staircases with wooden (or similar material) stringer:

Calculators of staircases with steel (metal) stringer:

Other types:

We hope this information will help you to calculate staircase concrete quantity.

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