Rebar Weight Calculator
This rebar weight calculator turns a bar size, length and count into total weight, useful for delivery, hauling and pricing by the pound.
Rebar weight is bar length times weight per foot. #4 bar (1/2 inch) weighs 0.668 lb per foot, so a 20-ft stick is 13.4 lb, and ten sticks weigh 133.6 lb (about 60.6 kg). Heavier bars climb fast: #8 bar weighs 2.67 lb per foot.
Your numbers
Result
How to calculate rebar weight
Rebar is sold and shipped by weight, and each U.S. bar size has a known weight per foot. Multiply that by the total length. The bar number tells you the diameter in eighths of an inch: #4 is 4/8 in, or 1/2 in.
kilograms = pounds ÷ 2.20462
Example: ten 20 ft bars of #4 is 200 ft. At 0.668 lb per foot that is 133.6 lb, or about 60.6 kg. One bar alone weighs 13.4 lb.
Rebar weight chart
| Bar | Diameter | lb per foot | kg per meter |
|---|---|---|---|
| #3 | 3/8 in | 0.376 | 0.560 |
| #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 | 2.670 | 3.973 |
What it is used for
- Checking a delivery against the order and the truck's weight limit.
- Comparing prices quoted per pound versus per stick.
- Planning how many sticks one person can carry or hoist.
To work out how many bars a slab needs, use the rebar calculator. For the concrete itself, see the concrete calculator, and for other weight conversions the yards to tons calculator.
Frequently asked questions
How much does a piece of rebar weigh?
A 20 ft stick of #4 rebar weighs about 13.4 lb. #3 is about 7.5 lb, #5 about 20.9 lb and #6 about 30 lb.
How much does #4 rebar weigh per foot?
0.668 lb per foot (about 0.994 kg per meter).
What does the number on rebar mean?
The diameter in eighths of an inch. #5 is 5/8 in, #8 is 1 in.
How many sticks of rebar are in a ton?
A short ton is 2,000 lb. For 20 ft sticks of #4 bar (13.36 lb each) that is about 150 sticks.
Is rebar weight the same everywhere?
Standard sizes have nominal weights, but real weight varies slightly with the mill and any coating.
Sources and further reading
- Rebar: standard U.S. bar sizes, diameters and weights — Wikipedia
- NIST Special Publication 811: conversion factors — National Institute of Standards and Technology
These references support the general guidance on this page. The calculator applies the standard formulas shown above to the numbers you enter.
Embed this calculator on your website
Free to use on any site. Paste this code where you want the calculator to appear. More about embedding.
Related calculators
. Estimates only. Always confirm quantities with your supplier or a qualified contractor before ordering, and add extra for waste and site conditions.