Rebar Weight Calculator
Find the weight of rebar by size and length, for US (#2–#18), Canadian (10M–55M) and metric bars, with a size chart.
Change the values and press Calculate to work out your own figures.
Choose the bar size and enter the length and the number of bars.
Show the working
- weight = bars × length × weight per length
How to use it
Choose the bar size and enter the length and the number of bars.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
weight = number of bars × length × weight per unit length
Bar numbers
A US bar's number is its diameter in eighths of an inch (#4 = 1/2 in); a Canadian bar's is its rounded diameter in mm (15M ≈ 16 mm).
Rebar sizes
| Bar | lb/ft | kg/m |
|---|---|---|
| #2 (1/4 in) | 0.167 | 0.249 |
| #3 (3/8 in) | 0.376 | 0.56 |
| #4 (1/2 in) | 0.668 | 0.994 |
| #5 (5/8 in) | 1.043 | 1.552 |
| #6 (3/4 in) | 1.502 | 2.235 |
| #7 (7/8 in) | 2.044 | 3.042 |
| #8 (1 in) | 2.67 | 3.973 |
| #9 (1 1/8 in) | 3.4 | 5.06 |
| #10 (1 1/4 in) | 4.303 | 6.404 |
| #11 (1 3/8 in) | 5.313 | 7.907 |
| #14 (1 3/4 in) | 7.65 | 11.384 |
| #18 (2 1/4 in) | 13.6 | 20.239 |
| 10M | 0.527 | 0.785 |
| 15M | 1.055 | 1.57 |
| 20M | 1.582 | 2.355 |
| 25M | 2.637 | 3.925 |
| 30M | 3.692 | 5.495 |
| 35M | 5.275 | 7.85 |
| 45M | 7.912 | 11.775 |
| 55M | 13.187 | 19.625 |
| Ø6 mm | 0.149 | 0.222 |
| Ø8 mm | 0.265 | 0.395 |
| Ø10 mm | 0.415 | 0.617 |
| Ø12 mm | 0.597 | 0.888 |
| Ø14 mm | 0.813 | 1.21 |
| Ø16 mm | 1.062 | 1.58 |
| Ø20 mm | 1.66 | 2.47 |
| Ø25 mm | 2.587 | 3.85 |
| Ø28 mm | 3.246 | 4.83 |
| Ø32 mm | 4.24 | 6.31 |
| Ø40 mm | 6.626 | 9.86 |
| Ø50 mm | 10.348 | 15.4 |
Questions
How much does #4 rebar weigh?
0.668 lb per foot; a 20 ft bar weighs 13.36 lb.
How much do 20 bars of #4, 60 ft long, weigh?
801.6 lb.
Formulas
weight = number of bars × length × weight per unit length
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.