Enter the rebar radius (in) and the rebar length (ft) into the Rebar Weight Calculator. The calculator will evaluate the Rebar Weight. 

Rebar Weight Formula

The following two example problems outline the steps and information needed to calculate the Rebar Weight.

RW = pi*(r/12)^2*L *490


  • RW is the Rebar Weight (lb)
  • r is the rebar radius (in) 
  • L is the rebar length (ft) 

How to Calculate Rebar Weight?

The following steps outline how to calculate the Rebar Weight.

  1. First, determine the rebar radius (in). 
  2. Next, determine the rebar length (ft). 
  3. Next, gather the formula from above = RW = pi*(r/12)^2*L *490.
  4. Finally, calculate the Rebar Weight.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

rebar radius (in) = 4

rebar length (ft) = 150

RW = pi*(r/12)^2*L *490 = ?