## What Is Staircase?

Important Point

Staircase, series, or flight, of steps between two floors. Traditionally, the staircase is a term for stairs accompanied by walls, but contemporary usage includes the stairs alone.

## How to Calculate Number of Riser and Tread for a Staircase Steps?

Requirement of Staircase Calculation.

**Hight of Staircase.****Length of Staircase.****Maximum height of riser should be 150 mm (150 mm to 200 mm)****Minimum tread length should be 300 mm (250 mm to 300 mm)****Length of the step should be a minimum of 1000 mm****Handrail height should be a minimum of 1000 mm.****Width of the landing slab will be at least 1000 mm for the walkover on the staircase.**

Also, read: Type of Stair | Stairs Parts Names & Details

## Staircase Design Calculation Example

Now we are going to calculate the required number of Riser and Tread for a Dog legged staircase having

**1 Meter Width of Landing Slab****3 Meter Height****4 Meter Width****Middle Slab Highet 1.5 m**

### Staircase Dimension Calculation Formula

- Number of Tread = Length of Stair/One number of Tread
- Number of Riser = Height of Staircase/ Height of one number of Riser

**From the above Diagram,**

The staircase has divided into two flights providing a landing slab at mid of the staircase height.

**So Number of Riser = Height of Staircase / Height of one Rise**- Number of Riser = 1500/150
**Number of Riser = 10 Nos****So as per standard, we are providing 300 mm as tread length.****Number of Tread = Length of Stair/One number of Tread**- Number of Tread = 3000/300
**Number of Tread = 10 Nos**- Hence the required number of Riser and Tread is
**10 Nos.** **Total No Staircase of = Below landing + Above landing**- Total No Staircase of =
**10 Nos + 10 Nos = 20 Nos**of Stire required to achieve**3 m hight**

Also, read: How to Calculate Staircase | Concrete & Bar Bending Schedule (BBS) | Staircase Reinforcement Details

## Concrete Calculation of Staircase

**Section 1**

- Landing area concrete =
**L x B x H** - Landing area concrete =
**1.0 m. x 2.0 M. x 0.150 M**. - Landing area concrete =
**0.3 Cu.m.**——–**(1)**

**Section 2**

- Waist Slab Laenght =
**(a**^{2}+b^{2})= c^{2} - C = Lenght of Waist slab
- A = Hight of Landing Slab
- B = Breadth of Wasit slab
- Waist Slab Laenght =
**(1.5**^{2}+3.0^{2})= c^{2} - Waist Slab Laenght =
**c****=√(11.25)** - Waist Slab Laenght =
**c****=3.35 m** - Wasit slab area concrete =
**L x B x H x N** - Wasit slab area concrete = 3.35 m. x 1.5 m. x 0.150 m. x 2 Nos.
- Wasit slab area concrete =
**1.501 Cu.m**. ——–**(2)**

**Section 3**

- Steps area concrete =
**L x Volume of triangular area x N x Q** - Steps area concrete = 1.0 m. x ( 0.300 m. x 0.150 m x (1/2)) x 2 Nos. X 10 Qty
- Steps area concrete =
**0. 45 Cu.m.**——–**(3)** - Total Concrete of Staircase =
**(1) + (2) + (3)** - Total Concrete of Staircase =
**0.30 Cu.m. + 1.501 Cu.m. + 0. 45 Cu.m.** **Total Concrete of Staircase = 2.251 Cu.m.**

### Staircase Design Calculation

**Calculate**the number of steps that will be needed. Considering an ideal riser of 18 cm, the height of the space is divided by the height of each step.**Calculate**the height of each riser.**Calculate**the width of the tread.

### Stair Tread Calculation

The vertical distance between the floors to be linked by the staircase is the principal determinant of the riser and tread dimensions. **You divide the height by 7 inches**; if, say, the floor-to-floor distance is 8 feet, 10 inches (or 106 inches), then you’ll need 15 treads (106 divided by 7 equals 15.14).

### Standard Staircase Dimensions

The general rule (in the US) is **7-11 (a 7 inch rise and 11 inch run) (17.78cm-27.94cm)**. More exactly, no more than 7 3/4 inches (19.7cm) for the riser (vertical) and a minimum of 10 inches (25.4cm) for the tread (horizontal or step). You can find some more information here as well on other stair-related dimensions.

### Stair Formulas

You **divide the height by 7 inches**; if, say, the floor-to-floor distance is 8 feet, 10 inches (or 106 inches), then you’ll need 15 treads (106 divided by 7 equals 15.14). Next, you divide the height by the number of treads (15 into 106), producing the exact tread height (7.06 inches).

### Stair Stringers Formula

Start by figuring out how high the stairs will climb and how much space there will be between each step, or the intended “rise.” **Divide the height by the approximate rise to determine** the total number of steps needed, then take the difference of the height and that number to find the exact rise of each step.

### Length of Staircase for 10 Foot Ceiling

The total length of a flight of stairs for a 10-foot ceiling is **approximately 12-feet long.**

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**Suggested Read –**

- How to Structural Design a Building/House Step by Step Part-4 (Column Design)
- How to Structural Design a Building/House Step by Step Part-3 (Slab Beam Design)
- How to Structural Design a Building/House Step by Step Part-2 (Two Way Simply Support Slab)
- How to Structural Design a Building/House Step by Step Part-1 (One Way Simply Support Slab)
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Satheesh says

Nice Article Dear

Krunal Rajput says

Thanks