# 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.

**Quick answer:** 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.

_Last updated: October 3, 2026. Estimates only; confirm quantities with your supplier._

## 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.

```
weight = bar length × number of bars × weight per foot
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](../rebar-calculator/). For the concrete itself, see the [concrete calculator](../concrete-calculator/), and for other weight conversions the [yards to tons calculator](../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](https://en.wikipedia.org/wiki/Rebar) — Wikipedia
- [NIST Special Publication 811: conversion factors](https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors) — National Institute of Standards and Technology