**Thumb Rules Formula for Civil Engineers & Quantity Surveyors | Thumb Rules for Civil Engineering**

**Thumb Rules for Civil Engineering Construction** are quick formula used by **Civil Engineers** and **Quantity Surveyors** to estimate the quantities of materials, strength, and reinforcement needed for a construction project. These thumb rules are widely used in **Civil Site Engineering** and are helpful to **calculate Steel** in **RCC**, **Brick Calculation**, **Concrete Mix Design** and **Shuttering Work**. They can be found in **Civil Engineering pdfs** and are based on past experiences and common practices, but it’s important to adapt them for specific requirements of each **construction project**.

**Thumb Rules For Civil Site Engineer pdf**

**Thumb Rules For Civil Engineering** is essential for any **civil engineer,** Site engineer, or civil supervisor. They play a crucial role while taking quick decisions on site. There is some **Civil Engineering Basic Knowledge **that every civil engineer must know.

**Thumb Rule of Civil Engineering** or the thumb rule for construction helps you in finding out the solution using a simple **mathematical formula** and make smart decisions whenever needed.

But, while using these** thumb rules**, you must remember that the thumb rule never gives the exact or accurate results, you just have used them for **approximate results**.

There is** **a number** **of **Thumb Rule For Civil Engineers **that we used in **construction work**. So, the following are some most frequently used Thumb rules on the **Construction site**.

The Thumb rule method is an **approximate **& **comparing method.** In thumb rules and the **units **are not the same when we compare to get the results. So, ignore **units **while performing the **thumb rule**.

**Thumb Rules for Civil Engineering In Construction**

Following are thumb rules in **Civil Engineering**,

**1. Thumb Rule for Concrete Volume**

The **volume of concrete** required = **0.038 m3/square feet **area

**Example:-**If Plan Area = 40 x 20 = **800 Sq. m**.

So, for the plan area of **800 Sq. m.** the area the total volume of** concrete **required

= 800 x 0.038m3 = **30.4m3**

**2. Thumb Rule for Steel Quantity for Slab, Beams, Footings & Columns**

Following are some important **thumb rules** for **steel calculation** for slab, beam, column, and footings.

Steel required in **residential buildings = 4.5 Kgs – 4.75 Kgs / sq. Ft.**

Steel required For **Commercial **buildings** = 5.0 Kgs-5.50 Kgs/Sq. Ft.**

You can also use** BN Datta** recommendations for the more accurate result,

The following recommendations** Thumb Rules For Civil Engineering are given in B N Datta** for the Steel quantity used in different members of the building.

**3. Percentage of Steel in Structural Members**

Following are thumb rules for **reinforcement in concrete** members,

**Slab**–**1%**of the total volume of concrete (**Slab steel calculation**thumb rule)**Beam**–**2%**of the total volume of concrete**Column**–**2.5%**of total volume of concrete**Footings**–**0.8%**of the total volume of concrete

**Example:**

How to calculate the **steel quantity** of slab having the Length, width, and depth of the slab is** 5m x 4m x 0.15m**

**Step 1: Calculate the Volume of Concrete:**

The Total Volume of **Concrete **for given Slab =** 5 x 4 x 0.15**

=** 3m ^{3}**

**Step 2: Calculate The Steel Quantity Using Formula:**

As per the guidelines are given in the **BN Dutta **reference book the **steel quantity** of slab is **1%** of the **total volume** of concrete utilized.

Thumb rule to estimate Steel quantity of above slab = **Volume of Concrete x Density of Steel x % of Steel of Member**

Steel weight required for above slab = 3 x 7850 x 0.01 = **235 Kgs**

For accurate **estimation**, you can refer to **Bar Bending Schedule**

**4. Thumb Rules For Shuttering Work**

**Shuttering** costs are taken as **15-18%** of the **total construction **of the building. **Shuttering work **is done to bring the concrete in Shape. The Thumb rule to estimate the **shuttering **required is **6 times** the quantity of concrete or 2.4 times of the **Plinth area****.**

For example, the **concret**e quantity is 0.5m^{3}, then

Area of **Shuttering **is 0.5 x 6 = 3m^{2}

**Components of Shuttering**

The Shuttering plate **Ply, Battens, Nails** are components of Shuttering.

**Shuttering Ply Quantity estimation**

Suppose, The **Shuttering Ply** has a length, width & depth of 2.44 x 1.22 x 0.012

The No. of Shuttering **Ply Sheets = 0.22 **times of Shuttering

Suppose, the **Shuttering Area** = 3m

Then Ply required for shuttering = 0.22 x 3 = **0.66m ^{2 }**

**5. Battens Quantity Calculation**

**Shuttering Batten **usually has a **length** & **width **of 75mm x 40mm.

**Batten Quantity = **19.82 x No. of Ply Sheets

If work requires **25 Ply sheets,** the total quantity of Battens are 19.82 x 25 = **495 **Battens

**Nails & Binding Wire Quantity in Shuttering:**

Approximately,

**75 grams** of **Nails **were used in the shuttering of the **1m ^{2} area.**

75gms of** Binding wire** is used for every 1m^{2} of Shuttering.

**Thumb rule for Shuttering oil estimation :**

Shuttering oil is applied on the **shuttering plate** surface used to** de-frame** or **de-assemble** from the concrete easily.

**Total required Shuttering oil** = 0.065 x Total Area of Shuttering

(or)

For every **15m ^{2}** of shuttering

**1 liter**of

**shuttering oil**is consumed.

Example :

If, total area of shuttering is 15 m2, then Shuttering **oil Consumption **=** **0.065 x 15 = **0.975.**

**6. Thumb Rule for Cement, Sand, Coarse Aggregate Quantity Calculations**

**Note: 1 bag of cement = 50Kgs**

Thumb rule for Cement required in **Brickwork**, **Cement Masonry **& **Plastering **work in construction.

**7. Thumb Rule for Concrete Mix Designs**

**FOR ADDING 4 LITERS OF WATER IN 1 CU.M FRESHLY MIXED CONCRETE**

**IF THE TEMPERATURE OF FRESHLY MIXED CONCRETE IS INCREASED BY 1%, THEN**

**IF THE AIR CONTENT OF FRESHLY MIXED CONCRETE IS**

**8. Basic Thumb Rules Used in Building Construction**

**1. Minimize floor-to-floor height:**

**2. Use repetitive formwork**

**3. Use standard column size**

**4. Adopt uniform column layout**

**5. As far as possible, use the same depth for beams**

**6. Use high strength concrete in columns**

**7. Use high early strength concrete**

**8. Specify self-consolidating concrete**

**9. Specify locally available materials**

**10. Use the commonly available size of bars and spirals**

**11. Use the largest bar size that satisfies the design considerations**

**12. Eliminate bent bars where possible**

**13. Avoid the congestion of steel**

**9. Thumb Rules For Civil Engineers for Brickwork or Brick Calculation**

following are **Thumb Rules for civil engineering** for brickwork and **cement quantity** calculations.

Brickwork for 1m^{3} |
Cement Qty in m^{3} |
Cement Qty in Bags |

230 mm Brickwork | 0.876m^{3} |
25.4 Bags |

115 mm Brickwork | 0.218m^{3} |
6.32 Bags |

** Thumb Rules for Civil Engineering **

**10. Thumb Rules For Cement Masonry Quantity**

Cement Masonry Type & Mix |
Cement Qty in Bags |
Cement Qty in Kgs |

200mm in Cement Masonry work of Ratio 1:6 | 0.124Bags/m^{2} |
6.2Kgs/m^{2} |

150mm in Cement Masonry work of Ratio 1:6 | 0.093Bags/m^{2} |
4.65Kgs/m^{2} |

200mm in Cement Masonry work of Ratio 1:4 | 0.206Bags/m^{2} |
10.3Kgs/m^{2} |

150mm in Cement Masonry work of Ratio 1:4 | 0.144Bags/m^{2} |
7.2Kgs/m^{2} |

100mm in Cement Masonry work of Ratio 1:4 | 0.103Bags/m^{2} |
5.15Kgs/m^{2} |

**Thumb Rules for Civil Engineering**

**11. Thumb Rules Plastering Quantity**

Type of Plastering |
Cement Qty in Bags |
Cement Qty in Kgs |

Rough Plastering | 0.09 Bags/m^{2} |
4. 5Kgs/m^{2} |

Internal Wall Plastering | 0.09 Bags/m^{2} |
4.5 Kgs/m^{2} |

Duct Plastering | 0.09 Bags/m^{2} |
4.5 Kgs/m^{2} |

External Wall plastering | 0.175 Bags/m^{2} |
8.75 Kgs/m^{2} |

Stucco Plastering | 0.175 Bags/m^{2} |
8.75 Kgs/m^{2} |

Lathen Plastering | 0.55 Bags/m^{2} |
27.5 Kgs/m^{2} |

**Thumb Rules for civil engineering**

**12. Types of Area and Some Useful Requirements for Building:**

**1. Carpet area:**

The actual area you use. The area on which ‘**you can put a carpet**’.

**2. Built up area:**

**Carpet area** + **area of walls and ducts**. Around 10% more than the carpet area. A terrace is considered as half the actual area for calculating built up area. Some projects charge dry terrace same as internal rooms.

**3. Super built up / Saleable area:**

**Built up area** + **markup for common spaces** like lifts and stairs. Usually 25% more than the built up area.

**FAQs**

**What is Thumb Rule?**

The **rule of thumb**is colloquially referred to as a thumb rule. A

**Thumb Rule**is a guideline which provides concise advice on a given subject. It is a general concept that offers specific guidance for executing or approaching a given task. Thumb rules usually evolve as a result of practice and experience rather than a theoretical study.

**How do you calculate the steel by thumb rule?**

- Slab – 1% of the total volume of concrete (Slab steel calculation thumb rule)
- Beam – 2% of the total volume of concrete
**Thumb Rule for Shuttering Work** - Column – 2.5% of the total volume of concrete
- Footings – 0.8% of the total volume of concrete

**What is a Good Rule of Thumb?**

**“Arrive early”**is an efficient good Thumb Rule for most appointments. It referred to builders who frequently use their thumb to estimate measurements. It is a helpful rule even being inexact.

**Thumb Rule for Shuttering Work**

**What is the Basic Knowledge of Civil Engineering?**

**BASIC THINGS CIVIL ENGINEERS**

**SHOULD KNOW**,

- Lapping in reinforcement is not allowed for the bars having diameters more than 36 mm.
- Steel Char maximum spacing is 1.00 m (or) 1 No per 1m2.
- In steel dowels, a rod minimum of 12 mm diameter should be used.
- Steel Chairs minimum of 12 mm diameter bars to be used.
- Longitudinal reinforcement should not be less than 0.8% and more than 6% of gross C/S.
- The minimum bars used for a square column are 4 No’s and 6 No’s for the circular column.
**Thumb Rules for Steel in RCC**

**What is the Thumb Rule to determine Beam Depth?**

**Thumb Rule for Concrete Mix Design**

**Thumb Rules For Civil Site Engineer pdf**

**Thumb Rules For Civil Engineering**pdf is essential for any civil engineer, Site engineer, or civil supervisor. They play a crucial role while taking quick decisions on site. There is some

**civil engineering basic knowledge**that every civil engineer must know.

**Thumb Rules for Civil Engineering**

**Thumb rule requirement of standard materials and standard calculation in high raised building**,

- Steel =3 to 5 kg / sqft.
- Cement =0.5bags/ sqft.
- RMC =0.05 m3/sqft.
- Block =12.5 nos /sqm.
- Electrical cast = Rs 133/sqft.
**Thumb Rule for Brick Calculation** - Plumbing cost = Rs 126/sqft.
- Fire fighting cost = Rs 40/sqft.
- External development = Rs 94.5/sqft.
**Thumb Rule for Concrete Mix Design**

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**Conclusion:**

In conclusion, **thumb rules in civil engineering construction** are a quick and easy methods o formula used to estimate quantities, strength, reinforcement etc. They can be useful for quickly estimating the amount of materials needed for a project, but it’s important to double-check the calculations with detailed measurements and consult with relevant professionals. These thumb rules are based on past experiences and common practices and it’s necessary to adapt them to the specific requirements of each construction project.

Thank you for the full reading of this article in “**The Civil Engineering**” platform in English. If you find this post helpful, then help others by sharing it on social media. **If any formula of Civil Engineering is missing from this article please tell me in comments.**

Informative post sir, thank you for sharing this knowledgeable post, really this is very helpful.

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l learn from your information sir, thank you

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Very helpful post sir

Thanks a lot of.

welcome

Add these in your website

Is there any thumb rule for minor bridge,Major bridge and flyover structure Steel finding…..

not now, Thanks for the comments please visit more articles by clicking on “All Posts” tab of the Menu Bar

Please help me to find out the steel quantity in minor bridge, Major Bridge and flyover…..

I will try to upload this article

Sir here you written that Shuttering area is 3 M2..then how it is possible that the ply required is 0.66m2…we all know that the size of ply board is 2.44 x 1.22 = 2.9768 m2 area…please explain me sir..I am eager to know

please read it carefully again you will understand else i will try to explain u again

It will be more helpful if explanations come together with the right mathematical formula so that understanding can be easy.

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Thanks a lot sir.I am happy pl.up load more usefull article.

Thanks a lot Mr.Waseem for your outputs for the new commers and as well as for them who don’t have knowledge.

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Many Thanks for shaering this gret artical.

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Thanks sir its just awesome article

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Good information

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