#4 rebar, the most common size in home projects, weighs 0.668 lb per foot. A 20 ft bar weighs about 13.4 lb. The chart below covers #3 to #8.
Rebar weight per foot
| Bar size | Diameter | Weight per foot | 20 ft bar | 40 ft bar |
|---|---|---|---|---|
| #3 | 3/8 in | 0.376 lb | 7.5 lb | 15.0 lb |
| #4 | 1/2 in | 0.668 lb | 13.4 lb | 26.7 lb |
| #5 | 5/8 in | 1.043 lb | 20.9 lb | 41.7 lb |
| #6 | 3/4 in | 1.502 lb | 30.0 lb | 60.1 lb |
| #7 | 7/8 in | 2.044 lb | 40.9 lb | 81.8 lb |
| #8 | 1 in | 2.670 lb | 53.4 lb | 106.8 lb |
The bar number is the diameter in eighths of an inch, so #5 is 5/8 inch.
How to work out the weight of an order
Multiply the total feet of bar by the weight per foot. For 560 ft of #4: 560 × 0.668 = 374 lb.
| Total length | #3 | #4 | #5 |
|---|---|---|---|
| 100 ft | 38 lb | 67 lb | 104 lb |
| 250 ft | 94 lb | 167 lb | 261 lb |
| 500 ft | 188 lb | 334 lb | 522 lb |
| 1,000 ft | 376 lb | 668 lb | 1,043 lb |
Why weight matters
- Rebar is often priced by weight for larger orders.
- It tells you what your vehicle or trailer has to carry.
- Longer bars are heavy and awkward. Plan how you will unload them.
To find how many feet you need for a slab, use the rebar calculator.
Frequently asked questions
How much does #4 rebar weigh per foot?
0.668 lb per foot. A 20 ft bar weighs about 13.4 lb.
How much does a 20 ft piece of #5 rebar weigh?
About 20.9 lb, at 1.043 lb per foot.
What does the rebar number mean?
It is the bar diameter in eighths of an inch. #4 is 4/8, or half an inch.