**Thumb Rules for Staircase Design Calculation | Concrete Calculation of Staircase | What is Staircase**

In this Article today we will talk about the **Thumb Rules for StaircaseΒ | Stair Formula 2R T | Staircase Cost Calculator | Staircase Design Calculation ExampleΒ | Staircase Standard Step Height****Β |** **How to Calculate Concrete for Stairs | Concrete Stairs Design | Standard Staircase Sizes | Standard Stair Tread Thickness**

**What is Staircase?**

**Stairs** are used to move from floor to floor. Stairs allow access and communication between floors in multi-story **buildings**. The room or space between which a stair is located is known as the staircase.

It should therefore be covered with fire-resistant walls, floors, roofs and doors. It should be designed to carry certain loads used for the design of floors. Various materials such as wood, brick, stone, steel or reinforced cement **concrete** can be used for stair **construction**.

**Thumb Rules for Staircase Design Calculation:**

**Important points to consider when planning the staircase design calculation | Thumb Rules for Stircase**

**Width of Stair:**It should not be less than 1 m.**Length of flight:**The number of steps in a single flight should not be more than 12.**Pitch of the stair:**It should be between 25 to 40**Width of landing:**It should be 150mm, more than the width of stair.**Length of Step:**The length of the step should be at least 600 mm.**Winders or kite steps:**Odd shaped steps should be avoided and incase found necessary. These should be provided at the start of a stair.**Han-rails:**It should be 750 to 850 mm in height from the top of respective step or landing.**Step proportions:**The size of rise and tread in a stair should be kept uniform through out the whole stair.**Headroom:**Minimum of 2000mm of clear headroom is required above the pitch line**Following proportions are recommended:****Generally:**Riser (150 mm to 200 mm) , Tread (250 mm to 300 mm)**Residential buildings:**Tread=250 mm, Riser = 160mm**Public buildings:**Tread=300 mm, Riser= 150mm**Industrial buildings, Railway station, etc:**Tread = not less then 250 mm (250 to 300 mm) , Riser = not less then 150 mm (150 to 190 mm)

**Otherwise work out the sizes of rise and tread by using any one of the following proportions: Stair Formula 2R T**

- (2 x Rise) + (Going), In mm = 550 to 600 mm
- Rise x tread, both in cm = 400 to 410 cm2.
- With basic proportion of going 300 mm and rise 150 mm, add 10 mm to rise for every 20 mm deduction from going e.g. For a going of 280 mm the rise will be 160 mm.

The above rules act as guide but the actual sizes depend upon the availability of space, while planning stairs practical-field. **Staircase Cost Calculator**

**How to Calculate Number of Riser and Tread for a Staircase Steps | Stair Calculation Formulas:**

In this example we will take aΒ Floor to Floor level of **2800mm / 2.80m** (Total Rise).

Β

**1. Consider the Size of Riser:**

**Size of riserΒ **= 8β (inch) (Range of riser = 6βto 8β)

Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β = 200 mm (Range of riser = 150 mm to 200 mm Generally) **Staircase Cost Calculator**

**2. Consider the Size of Tread:**

**Size of Tread **= 11β (inch) (Range of riser = 10βto 1β²)

Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β = 275 mm (Range of riser = 250 mm to 300 mm Generally)

Formula, for the size of Tread if Run (Width) is given: So,Β **Size of Tread** = Total Run (width) of Stair / Nos. of Thread **Staircase Design Calculation Example**

**3. Calculate the Number of Risers:**

**Number of RiserΒ **= Clear Distance between two floors / Size of Riser

Β Β Β Β Β Β Β Β Β Β Β Β Β Β = (2800 / 200)

Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β = 14 nos.

Now, we will calculate the size of tread, **Staircase Design Calculation Example**

**4. Calculate the Number of Treads:**

We know that for any stair numbers of tread for any single flight are one less than several rises.)

**Nos of threadsΒ **on single flight = Nos. of Rising of single flight β 1

Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β = 14 β 1

Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β = 13 nos. **Staircase Standard Step Height**

**5. Calculate the Width of Run:**

So, The Total Run of Stair = Size of Tread x (Nos. of Threads + 1)

Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β = 275 x 14

Β Β Β Β Β Β Β Β Β Β Β ** Β Total Run = 3850 mm**

**6. Calculate the Angle of Stair:**

As we know that,

Tan Ζ = Rise / Run Angle of Stair =

Ζ = tan^{-1} (Total Rise / Total Run)

Β Β = tan^{-1} (2800 / 3850)

Β Β = tan^{-1} (0.72)

Β Β ** = 36 Degree**

So the required **Angle of Stair** is **36 Degree** Β **How to Calculate Concrete for Stairs**

**7. Calculate Step Length | Stair Formula 2R+t:**

Nicolas Francois Blondel (1675β1683) was the first known person to establish the ergonomic relationship of tread and riser dimensions in the last volume of his Cours dβarchitecture. **How to Calculate Concrete for Stairs**

He specified that 2 x riser + tread = step length.

**Step Length = 2R + T**

but here we consider directly step length = 1.2m **How to Calculate Concrete for Stairs**

**Final Data: Thumb Rules for Staircase**

**Size of Rizer = 200 mm****Size of Tread = 275 mm****Total Number of Risers = 14 Nos****Total Number of Treads = 13 Nos****Width of Total Run = 3850 mm****Angle of Stair = 36 Degree**

**Concrete Calculation of Staircase**

**Section 1: Lannding**

- We dont show landing in this example so we consider the size of landing i.e L=1.2m , B=2m and H=0.150m
- Landing area concrete =Β
**L x B x H** - Landing area concrete =Β
**1.2 m.Β x 2.0 M. x 0.150 M**. - Landing area concrete =
**0.36 Cu.m.**βββ**(1)**

**Section 2: Waist Slab**

- Waist
**Slab**Laenght =**Β (a**^{2}+b^{2})= c^{2} - C = Lenght of WaistΒ slab =
- A = Hight of Landing Slab = 2.800
- B = Breadth of Wasit slab = 3.850
- Waist Slab Laenght =
**(2.800**^{2}+3.850^{2})= c^{2} - Waist Slab Laenght =Β
**cΒ****=β(22.6625)** - WaistΒ SlabΒ Laenght =Β
**cΒ****=4.760 m** - Wasit slab area concrete =Β
**L x B x H x N** - Wasit slab area concrete = 4.760 m. x 1.2 m. x 0.150 m. x 1 Nos.
- Wasit slab area concrete =
**0.857 Cu.m**. βββ**(2)**

**Section 3: Steps**

- Steps area concrete =
**L x Volume of triangular area x No of Landings x Q** - Steps area concrete = 1.2 m. x ( 0.200 m. x 0.275 m x (1/2)) X 1 X 13 Qty
- Steps area concrete =Β
**0.429 Cu.m.**Β βββ**(3)** - Total Concrete of Staircase =
**Β (1) + (2) + (3)Β** - Total Concrete of Staircase =Β
**0.36 Cu.m. + 0.857 Cu.m. + 0.429 Cu.m.Β** **Total Concrete of Staircase = 1.646 Cu.m.**

After this Article you must read: **How to Calculate the Shuttering Quantity for Staircase**

**OTHER POSTS:**

**Design Example of Dog Legged Staircase****Basic Rules for Design of Column | Thumb Rules for Column Design****Earthwork Excavation Calculation for Road Work | Road Estimate in Excel****Basic Components of Road Structure and Method of Construction****General Notes for Civil Engineering | Standard Data for Civil Engineers****How to Calculate the Volume of Concrete for Staircase**

**FAQs:**

**For buildings other than dwellings:**

- A minimum stair width of 1200mm is acceptable where the stair is between enclosing walls, strings or up stands.
- A minimum width between handrails of 1000mm.
- If the width of the stair is more than 2m wide, the flight must be divided with a handrail to a minimum of 1m wide.

**For dwellings:**

- 900mm is an acceptable width for stairs.

Minimum headroom for a loft conversion can be reduced to 1.8m at its lowest point, but 1.9m at the centre point of the stair.

**Standard Staircase Sizes**

**For flights between landings the maximum number of riser should be:**

- Utility stairs β 16 risers
- General access stairs β 12 risers

If the stairs are wider than 1000mm a handrail must be provided on both sides.

**Conclusion:**

Full article on **Thumb Rules for StaircaseΒ | Stair Formula 2R T | Staircase Cost Calculator | Staircase Design Calculation ExampleΒ | Staircase Standard Step Height****Β |** **How to Calculate Concrete for Stairs | Concrete Stairs Design | Standard Staircase Sizes | Standard Stair Tread Thickness****.**Β Thank you for the full reading of this article in β**The Civil Engineering**β platform in English. If you find this post helpful, then help others by sharing it on social media. **If any formula of BBS is missing from this article please tell me in comments. Concrete Stairs Design**

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