Rebar Rough Estimate by Rebar to Concrete Density

The Rebar Rough Estimate by Rebar to Concrete Density calculator estimates the total weight  Concrete Slab with one Rebar Grid mat of reinforcement bars (rebar) needed for a concrete slab based on the dimensions of the slab and a rough estimate of 80kg of rebar per cubic meter of concrete in the slab.

INSTRUCTIONS: Choose units and enter the following:

• (L) Length of Slab
• (W) Width of Slab
• (D) Depth of Slab

Weight of Rebar (W):  The weight of rebar is returned in kilograms.  However, this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The formula for the rough estimate weight of rebar in a slab (estimate 1) is:

           W_rebar = L • W • D • 80kg/m³

where:

• W_rebar is the rough estimate of the weight of rebar in a slab
• L is the length of the slab
• W is the width of the slab
• D is the depth of the slab

Rebar and Slab Calculators:

• Compute the Length of Rebar needed for a slab. - This is an accurate engineering tool to compute the length of rebar in a rectangular grid based on all of the key specifications (rebar size, number of mats, lapping factors and more).
• Compute the Weight of Rebar in a slab. This is an accurate engineering tool to compute the weight of rebar in a rectangular grid based on all of the key specifications (rebar size, number of mats, lapping factors and more).
• Compute the Surface Area of a slab.
• Compute the Surface Area of Concrete Forms. 
• Compute the Volume of Concrete in a slab. 
• Compute the Total Weight of a Slab with Rebar
• Spanish Version: Calculadora de Barras de Refuerzo

Attribution

Thanks to Mithil Haldakar for the description of this estimation method in his answer in Quora.