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Rebar weight calculator

Pick a bar size and enter the length and number of bars to see the weight, using the ASTM standard bar data.

Enter your measurements

ft
Total weight13.4 lb0 tons
Weight per foot
0.668 lb/ft
Nominal diameter
0.5 in
Cross-section area
0.2 sq in
Total length
20 ft
How we got this

#4 (½ in, metric #13): 0.668 lb/ft

20 ft × 1 = 20 ft × 0.668 lb/ft = 13.4 lb

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Next: how many bars a slab grid takes · rebar sizes chart

Quick answers for common sizes

Worked examples for the Rebar Weight Calculator
ExampleAnswer
How much does #4 rebar weigh per foot0.668 lb per foot (13.4 lb per 20 ft stick)
How much does #5 rebar weigh per foot1.043 lb per foot (20.9 lb per 20 ft stick)
How much does #3 rebar weigh per foot0.376 lb per foot (7.5 lb per 20 ft stick)

Every bar size at the length and count above

Every bar size at the length and count above
Bar sizeTotal weightNominal diameter
#37.5 lb0.375 in
#413.4 lb0.5 in
#520.9 lb0.625 in
#630 lb0.75 in
#740.9 lb0.875 in
#853.4 lb1 in

Reinforcing bar is sized by number. In the US system the number is the diameter in eighths of an inch — a #4 bar is 4/8 = ½ in, a #5 is ⅝ in — up to #8 (1 in). Weights and areas are standardized under ASTM A615, so a #4 bar weighs 0.668 lb per foot whichever mill made it.

Rebar weight chart

ASTM A615 nominal values from Caltrans Bridge Design Details Table 13.1.1; metric designations and kg/m from Continental Steel’s rebar chart. Deformed bar is measured by its nominal diameter, not over the ribs.
US sizeMetric sizeDiameter (in)Diameter (mm)Area (sq in)lb per ftkg per m20 ft bar
#3#100.3759.50.110.3760.5607.5 lb
#4#130.50012.70.200.6680.99413.4 lb
#5#160.62515.90.311.0431.55220.9 lb
#6#190.75019.10.441.5022.23530.0 lb
#7#220.87522.20.602.0443.04240.9 lb
#8#251.00025.40.792.6703.97353.4 lb
#9#291.12828.71.003.4005.06068.0 lb
#10#321.27032.31.274.3036.40486.1 lb
#11#361.41035.81.565.3137.907106.3 lb

The metric sizes (#10, #13, #16…) are soft conversions of the same bars — the number is the nominal diameter in millimetres, rounded. A #13 bar is a #4 bar. The sizes chart with uses and notes is on rebar sizes chart.

Worked examples

Why the weight matters

Steel suppliers often price by weight, trucks and trailers have payload limits, and a bundle of bars can be heavier than it looks. Fifty 20 ft sticks of #5 is over half a ton. Bar size and spacing are structural choices from your plans; the rebar calculator counts the bars for a slab grid.

What you’ll need

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Frequently asked questions

How much does #6 rebar weigh per foot?

1.502 lb per foot (2.235 kg/m), so a 20 ft stick weighs about 30 lb.

What does the number on rebar mean?

In US sizes it is the diameter in eighths of an inch: #3 = ⅜ in, #4 = ½ in, #5 = ⅝ in. Above #8 the bars are slightly larger than the number suggests (#9 is 1.128 in) so that their areas come out round.

How many sticks of rebar are in a ton?

For 20 ft sticks: about 150 of #4 (13.4 lb each), 96 of #5 or 67 of #6, by weight alone.

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Sources

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