What size steel beam do you need for 3m, 4m, 5m, 6m, 7m, 8m & 10m span depends on various factors, including the load it needs to support and the type of steel beam being used. Common types of steel beams include I-beams, H-beams, and U-beams, and their sizes are typically specified in terms of depth, width, and weight per meter.

To determine the appropriate size of a steel beam for your specific span, you’ll need to consider the following:

1. Load: The amount of weight the beam needs to support, including dead loads (e.g., the weight of the beam itself) and live loads (e.g., people, equipment, or other objects).

2. Span: The distance between the supports where the beam will be placed.

3. Material and Steel Grade: The type and grade of steel you plan to use.

4. Building Codes: Adherence to local building codes and regulations is crucial.

5. Safety Factor: Consider a safety factor to ensure the beam can handle unexpected loads.

There is different shape and size of hot rolled Steel section such as H beam (universal column), I beam (universal beam), angles, channels and etc are used in construction project such as field of agriculture construction, industrial construction, multi storey building, different factories and residential projects. Today is the demand of steel structure in the field of construction projects that replace the depending on reinforced cement concrete, their higher strength, less time consuming, make it ideal for residential project in short duration.

Steel beam is also known as Universal beam or UB’s or I beam or H beam, W beam, rolled steel joist (rsj), double T due to their shape. Steel beam are very versatile and can be used in various structural Steel construction project. It is consist of two horizontal plates known as flanges connected by vertical component known as web. Generally depth of Universal beam or steel beam is greater than their width which makes them suitable for beam application where strength needs to be in one of direction. Which is the most often used section for structural Steel purpose.

A **rolled steel joist** (RSJ) is a common type of beam used for structural steelwork. It is also known as an ‘I-beam’. Rolled steel joist (srj) are usually made from mild steel but can also be formed from aluminium or other materials.

Steel beam or universal beam are extremely effective for use as structural Steel. they provide the maximum amount of strength for the volume of Steel used in making them the most efficient method of carrying bending and shear loads. In this artical you know about Steel beam size for 3m, 4m, 5m, 6m, 8m and 10m span according to Thumb Rule and experience basis.

Generally ISMB100 or UB100×75, ISMB150 or UB150×75, ISMB200 or UB200×100, ISMB100 or UB250×125, ISMB300 or UB300×140, ISMB350 or UB300×140, ISMB400 or UB400×140, ISMB450 or UB450×150, ISMB500 or UB500×180, ISMB550 or UB550×190 and ISMB600 or UB600×210 steel beam are used in construction industries.

In general, the steel beam size represented by dimensions of web × flange × weight per unit length, measured in mm or inch such as size of steel beam ismb150 represented as 150 × 75 or 6″×3″, where 150mm is depth of steel beam, 75mm is their flange width.

Variation among the universal beam include material, length of the web and depth of flanges. Different weight loads and area will require different measurement on the beam, the longer the web, the more force it can stand up and down, the wider of flange, the more side to side movement the Beam can withstand. Wide flange beam are also known as W- beam.

**Steel beam size for 3m, 4m, 5m, 6m, 7m, 8m & 10m span**

Structure steel is a versatile building material, though it can be used in great variety of ways. The most economic span range for conventional steel floor and roof framing is from 20 to 32 feet (6 to 10m).

In general, the size of steel beam (or RSJ, UB, ISMB, w or i beam) required for a 10m span need to be 500×180 mm, while the size of steel beam required for a 8 to 9m span need to be 400×140 mm. Moreover, the size of steel beam for a 6m span need to be 300×140 mm, while the size of steel beam for a 5m span need to be 250×125 mm. In addition, the size of steel beam for a 4m span need to be 200×100 mm, while the size of steel beam for a 3m span need to be 150×100 mm and the size of steel beam for a 7m span need to be 350×140 mm.

**Steel beam span rule of thumb**

**Based** **on** **common** **experience** **and** rule of thumb to calculate required and necessary depth of **beam** divide span in mm by **18-20** **e.g.** **Beam** s**pan** in **mm/depth** = **18-20** for **the** **primary** beam and for secondary beam span length to depth ratio is about 15 to 18. The width of this beam would be 1/3 and 1/2 of the depth. The dimensions of a Girder would be same, but the flange would be thicker. A beam overhang can be maximum of 3/8 of the supported span.

**Steel beam or rsj size for 3m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 3m span ought to be 150×75 mm at normal load condition.

Typically, for the steel Beam UB 150×75, the depth of the beam section is 150mm (6″) and the flange width or beam width is 75mm (3″). Mathematical calculation such as depth of steel beam = 3× 1000mm/20 = 150mm or 6″ and width of beam = depth/2 = 150mm/2 = 75mm.

**Steel beam or rsj size for 4m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 4m span ought to be 200×100 mm at normal load condition.

Typically, for the steel Beam UB 200×100, the depth of the beam section is 200mm (8″) and the flange width or beam width is 100mm (4″). Mathematical calculation such as depth of steel beam = 4× 1000mm /20 = 200mm or 8″ and width of beam = depth/2 = 200mm/2 = 100mm.

**Steel beam or rsj size for 5m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 5m span ought to be 250×125 mm at normal load condition.

Typically, for the steel Beam UB 250×125, the depth of the beam section is 250mm (10″) and the flange width or beam width is 125mm (5″). Mathematical calculation such as depth of steel beam = 5× 1000mm /20 = 250mm or 10″ and width of beam = depth/2 = 250mm/2 = 125mm.

**Steel beam or rsj size for 6m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 6m span ought to be 300×140 mm at normal load condition.

Typically, for the steel Beam UB 300×140, the depth of the beam section is 300mm (12″) and the flange width or beam width is 140mm (6″). Mathematical calculation such as depth of steel beam = 6× 1000mm /20 = 300mm or 12″ and width of beam = depth/2 = 300mm/2 = 150mm, but 140mm flange width is used.

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**Steel beam or rsj size for 7m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 7m span ought to be 350×140 mm at normal load condition.

Typically, for the steel Beam UB 350×140, the depth of the beam section is 350mm (14″) and the flange width or beam width is 140mm (6″). Mathematical calculation such as depth of steel beam = 7× 1000mm /20 = 350mm or 14″ and width of beam = depth/2 = 350mm/2 = 175mm, but 140mm flange width is used.

**Steel beam or rsj size for 7.5m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 7.5m span ought to be 350×140 mm at normal load condition.

Typically, for the steel Beam UB 350×140, the depth of the beam section is 350mm (14″) and the flange width or beam width is 140mm (6″).

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**Steel beam or rsj size for 8m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 8m span ought to be 400×140 mm at normal load condition.

Typically, for the steel Beam UB 400×140, the depth of the beam section is 400mm (16″) and the flange width or beam width is 140mm (6″). Mathematical calculation such as depth of steel beam = 8× 1000mm /20 = 400mm or 16″ and width of beam = depth/3 = 400mm/ = 133mm, but 140mm flange width is used.

**Steel beam or rsj size for 9m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 9m span ought to be 400×140 mm at normal load condition.

Typically, for the steel Beam UB 400×140, the depth of the beam section is 400mm (16″) and the flange width or beam width is 140mm (6″).

**Steel beam or rsj size for 10m span**

Typically for residential buildings or any other projects, the size of a steel beam (RSJ, universal beam or w beam or I beam or UB’s) required for a 10m span ought to be 500×180 mm at normal load condition.

Typically, for the steel Beam UB 500×180, the depth of the beam section is 500mm (20″) and the flange width or beam width is 180mm (7″). Mathematical calculation such as depth of steel beam = 10× 1000mm/20 = 500mm or 20″ and width of beam = depth/3 = 500mm/3 = 166mm, but 180mm flange width is used.

**Disclaimer**: All the given Steel beam size are based on thumb rule and it can be used for general knowledge purpose, do not use it for professional because actual size of steel beam based on steel design structure.

**Conclusions:**

In general, for a 3m span, the typical size of steel beam need to be 150×75 mm, while for a 4m span, the typical size of steel beam need to be 200×100 mm. Moreover, for a 5m span, the typical size of steel beam need to be 250×125 mm, while for a 6m span, the typical size of steel beam need to be 300×140 mm. In addition, for a 8m span, the typical size of steel beam need to be 400×140 mm, while for a 10m span, the typical size of steel beam need to be 500×180 mm.