## What Is Staircase?

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.**

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