**How To Calculate The Concrete Volume for Stair**

In this article we will discuss the stair concrete volume step by step.** Calculate The Concrete Volume for Stair. How To Calculate The Concrete Volume for Stair |Concrete for the Riser And Tread |Concrete For Waist Slab |Concrete For Landing Slab |How To Calculate The Number of Risers |How To Calculate the Number of Treads. How To Calculate The Concrete Volume for Stairs**

**How To Calculate The Concrete Volume for Stairs**

We calculate the concrete volume for stairs by using some given data. Given data is used just for example to better learn. Normally the Calculation for concrete is the main parts Landing Slab, Waist Slab, Riser, and tread.

**Concrete For Landing Slab**

**Concrete For Waist Slab**

**Concrete For Riser**

**Concrete For Tread**

**Given Data For Emaple**

Length of the landing = 1000mm = 1m

Width of the landing = 900mm = 0.900m

Thickness of the landing = 200mm = 0.200m

Number of the Landing slab = 2 (**bottom and top)**

Height of Landing OR Stair From Top To Bottom = H= 1300mm = 1.3m

Length of the stairs =B= 2000mm=2m

Width of the waist slab = 1000mm = 1m

The thickness of the waist slab = 150mm = 0.150m

width of the step = 1000mm = 1m

Riser Size =h = 162.50mm = 0.162m

Tread Size = b = 250mm = 0.250m

**Solution**

**1st Step**

**How To Calculate The Number of Risers **

Calculate the Number of Risers = Stair Height / Risers Height

**Calculate the Number of Risers = 1300 / 162.50 = 8.02 = 8Numbers**

**How to Calculate the Number of Treads **

Calculate the Number of Treads = length of the stairs / Sixe of Tread

**Calculate the Number of Treads = 2000 / 250 = 8 Numbers**

Now we calculate the concrete for the landing slab

**Concrete For Landing Slab**

Concrete for landing slab = Number of landing × Volume of the landing slab

The volume of the landing slab = length × width × thickness

**The volume of the landing slab = 1000 × 900 × 200 = 0.18m³**

**Concrete for landing slab = 2 × 0.18 = 0.36m³**

**2nd Step**

**Concrete For Waist Slab**

Concrete for the waist slab = Length × width × thickness

Now we calculate the Length of the Waist Slab using **Pythagoras’ theorem**

**Pythagoras’ theorem W² = B² + H²**

length of the stair =B= 2000 = 2m

Height of the shair= H= 1300 = 1.3m

W =?

W² = B² + H²

W² = 2² + 1.3²

W² = 5.69

**Taking Both Sides Uderroot (√)**

√W² = √ 5.69

**W = 2.385m This is the length of the waist**

**Concrete for the waist slab = Length × width × thickness **

Concrete for the waist slab = 2.385 × 1 × 0.150

**Concrete for the waist slab = 0.357m³**

**Concrete for the Riser And Tread**

The number of the riser and tread is the same so we use them to make a like one triangle prism. we use the formula of triangle prism for the calculation of the concrete for the riser and tread one time,

Length of the Riser and tread = 1000mm = 1m

Size of the Riser = h = 160.5m m=0.160m

Size of the tread = b = 250mm = 0.250m

Numbers of riser and tread = 8 Numbrs

**The formula for volume of prism =1/2[ length × height × thickness]**

Concrete volume for the riser and tread= 1/2 [1 × 0.160 × 0.250]

**Concrete volume for the riser and tread= 0.02m²**

Total Concrete volume for the riser and tread= Concrete volume for the riser and tread × Numbers

**Total Concrete volume for the riser and tread= 0.02 × 8 =0.16m³**

**Total concrete volume for the stair**

Total concrete volume for the stairs = Landing Slab + Waist Slab + Riser And Tread

**Total concrete volume for the stairs = 0.36 + 0.357 + 0.16 = 0.877m³ ****Approximately**** says 1m³**