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Stair Calculator

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Please check.

  • Mixing units for step (footing area] and riser (height] is the main cause of quantity errors, so please check the units.
  • Since the volume of the step and the lower sloped slab are added together, you must accurately enter the pure concrete thickness.
  • If stone or tile finishes are planned, please adjust and enter the frame dimensions in advance according to the finish thickness.
  • Since stair formwork is subject to strong lateral pressure, it is safer to reinforce it thoroughly and include a markup rate for bulging.
  • It is standard practice to leave a margin of about 0.5 to 1 cubic meter when placing an actual order, taking into account on-site loss and remaining pipeline volume.

How about this calculator?

Stair Calculator, Concrete Pouring Volume and Ready-Mix Concrete Cubic (㎥] Calculation Guide

We prevent material shortages by precisely calculating the volume of triangular sections and sloped slabs.

Stair Concrete Requirement Calculation Formula

Since the volume of a staircase is not a simple rectangle, it is accurate to calculate the sum by dividing it into the triangular 'step' section and the 'sloping slab' section supporting it.

1. Calculation of the total volume of the stair treads
Total volume = (Step × Riser / 2] × Width × Number of steps

After calculating the area of ​​the side triangle of one step, calculate by multiplying the width of the stairs by the total number of steps.

2. Calculation of Inclined Slab Volume
Slab Volume = Length of Slope (Hypotenuse] × Width × Floor Thickness

It is the volume of an inclined foundation slab supporting a stair load. The length of the slope is calculated using the Pythagorean theorem.

3. Final concrete pouring volume (surcharge reflected]
Total pouring volume (㎥] = (Volume + Slab volume] × (1 + Markup rate]

A markup rate is applied to the sum of the two volumes to account for losses during construction or formwork displacement.

Detailed Guide to Calculator Input Items

Please enter the specifications on the drawing or actual measurements for accurate calculations.

  • 1. Stair treads

    Enter the total number of steps (cells] required to go up from the floor to the next floor.

  • 2. Stair width

    Enter the width of the stairs. (Select unit: mm/cm/m]

  • 3. step

    It is more accurate to enter the pure frame dimensions excluding the nose section.

  • 4. Challenger

    It is the vertical height of a single step. All steps must be of consistent height to be safe.

  • 5. Slab thickness

    Please enter the thickness of the inclined floor slab supporting the stair load.

  • 6. Surcharge rate

    Usually, 5~10% is entered to account for losses during ready-mix concrete pouring or remaining pump truck volume.

Stair Construction Standard Specifications Guide (Refer to Building Act]

These are the recommended specifications for each application to ensure safe pedestrian movement. Please refer to the figures below when designing.

Applicable target Challenger height Step depth Features and Remarks
General detached house 180mm below 260mm more Standard residential stairs
public facilities 160mm below 280mm more BF (Barrier-Free Living Environment] Recommendation
Elementary school/educational facility 150mm below 260mm more Consideration of child pedestrian safety
Industrial facilities/external stairs 200mm below 240mm more Applicable in cases of limited space
note.

A minimum width of 1,200mm is recommended, and if the floor height is high, a 'landing' must be installed in the middle.

Essential Checklist for Fail-Free Construction

This is a practical checklist for professionals to prevent stair construction accidents.

  • Pre-reflecting finishing material thickness

    When finishing with tiles, the frame must be lowered by the thickness of the finish to prevent the height of the final tier from being misaligned.

  • Thoroughly reinforce the formwork

    Since stairs are subject to strong lateral pressure, please install supports securely to prevent bulging.

  • Checking horizontal level with a laser level

    Check the level before starting the first step, and check frequently to ensure that the height of each step is consistent.

  • Ensure rebar cover thickness

    Increase durability by using sufficient spacers to prevent the slab rebar from sticking to the floor.

Frequently Asked Questions (FAQ]

  • Q. Approximately how many steps can be constructed with 1 cubic meter (㎥] of stairs?
  • A. Based on a width of 1,200mm and a slab thickness of 150mm, approximately 8 to 10 layers can be constructed.
  • Q. Can spiral stairs or whirlwind stairs also be handled with this calculator?
  • A. It is optimized for straight or angled shapes, so errors may occur with spirals.
  • Q. How much margin should I allow when ordering ready-mix concrete?
  • A. We recommend ordering with a margin of 0.5 to 1.0 cubic meters above the calculated value, taking into account remaining equipment and formwork tolerances.