Rebar calculator

#4: 0.668 lb/ft. #5: 1.043 lb/ft.

Job sheet

Plumb rebar job sheet

#4 at 12 in each way.

  • Sticks to buy4320 ft sticks. Lap 2 ft is subtracted from the useful length.
  • Weight574 lb0.668 lb/ft, ASTM A615 nominal.
Plumb rebar job sheet
#4 at 12 in each way.

Sticks to buy: 43 (20 ft sticks. Lap 2 ft is subtracted from the useful length.)
Weight: 574 lb (0.668 lb/ft, ASTM A615 nominal.)

Lines of bar = the width divided by the spacing, plus the bar on the edge. Each line may take more than one stick if the run is longer than stock minus lap. You buy full sticks. The concrete those bars sit in is the concrete calculator.

FAQ

How much does rebar weigh?

#4 bar is 0.668 pounds per foot. #5 is 1.043. Those are the ASTM A615 nominal weights, the same figures on the South Dakota DOT bar table. The sheet multiplies the feet you buy, not the feet that end up in the slab after the lap is shared.

What is the lap?

You type it. A lap uses up part of each stick, so the useful length is stock minus lap. This page does not pick a lap from a code section. Ask the drawing or the inspector, then type that length.

Sources

  1. South Dakota DOT, reinforcing bar properties: Table 7.1. #3 is 0.376 lb/ft, #4 is 0.668, #5 is 1.043, #6 is 1.502.
  2. ASTM A615 bar chart: Same nominal weights through #11, plus #14 and #18.