Steel is an alloy of iron and carbon that's created by heating iron in the presence of oxygen. Iron is a soft, malleable metal, and by adding 1.5 to 2 percent carbon, it can be transformed into steel – a material that's stronger but less malleable. Stainless steel takes it a step further by adding varying amounts of chromium to prevent rust, while cast iron is formed when the carbon content is higher than 2 percent, making it harder to shape but able to be melted and cast into moulds.

A common requirement for the shape of steel is a round bar weight calculator.

This calculation provides a quick quantity estimate for rebar weight calculations for steel weight using the unit weight of steel.

Bar diameter

:12mm

Bar length

:1.5m

Number of bars

:9

Bar unit weight (m/kg)

:0.8874

Total weight

:11.98kg

Total weight (1)

:0.01198ton

To calculate the steel reinforcement bar tonnage, or create a steel bar weight calculator we first need to derive the **'unit weight of steel'**. Once we've got this, we can then easily calculate the tonnage of steel reinforcement bar for varying diameter bars.

A common factor is used for this in most countries, we show to derive it for metric units below, using the commonly used density of steel, 7850 kg/m3.

Which is commonly approximated to:

From here, it's easy! It's just a case of plugging in your bar diameter, and then multiplying the length and number of bars you have.

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