Bag Size Updated


#4 Rebar — Size, Weight, Use-Cases and More

Discover the use-cases, diameter, weight and more for this size of rebar.

Rebar Calculator

Calculate how much rebar you need. Choose your unit type & add as much rebar as needed.

Rebar Calculator

Calculate how much rebar you need. Choose your unit type & add as much rebar as needed.

Table of Contents

What is 4 rebar used for?

#4 rebar is commonly used in concrete construction for various applications where moderate reinforcement is needed. Some typical uses include:

  1. Concrete Slabs: Used as reinforcement in concrete slabs for residential, commercial, and industrial applications, including floors, driveways, sidewalks, and parking lots.
  2. Foundations: Employed in foundation construction to provide structural support and stability for buildings, retaining walls, and other structures.
  3. Columns and Beams: Used to reinforce columns, beams, and other structural elements in buildings and bridges to enhance load-bearing capacity and resist bending.
  4. Retaining Walls: Utilized in the construction of retaining walls to strengthen the structure and prevent soil erosion or collapse.
  5. Bridge Decks: Incorporated into bridge decks and highway structures to reinforce the concrete and ensure durability and longevity under heavy traffic loads.
  6. Pavements: Used in reinforced concrete pavements for roads, highways, and airport runways to improve strength and resist cracking.
  7. Water and Wastewater Structures: Employed in the construction of water treatment plants, wastewater treatment facilities, and storage tanks to provide reinforcement in concrete structures subjected to environmental conditions and water pressure.

Overall, #4 rebar is suitable for a wide range of construction projects requiring moderate to heavy-duty reinforcement in concrete structures.

Size & Diameter

What size is 4 rebar?

A #4 rebar (rebar size 4) has the following specifications:

  • Diameter: 1/2 inch (or 0.5 inches)
  • Metric Equivalent Diameter: 12.7 mm

The number "4" in #4 rebar means it is 4/8 inch in diameter, which simplifies to 1/2 inch. This sizing convention is commonly used in the United States to quickly identify the rebar size based on its number designation.

Weight Per Foot

4 rebar weight per foot

To determine the weight of #4 rebar per foot, you can refer to standard industry weights for rebar sizes:

  • Diameter: 4/8 inch (0.5 inches)
  • Weight: 0.668 pounds per foot, or 0.996 kilograms per meter

This means that if you have a length of #4 rebar, you can calculate its weight by multiplying the length in feet by 0.668 pounds per foot.

An Example

For a 10-foot length of #4 rebar:

Weight = 10 feet × 0.668 pounds per foot = 6.68 pounds

This weight calculation is helpful for estimating the total weight of rebar needed for a project or for making sure you’re compliant with structural design specifications.

Ton Count

How many 4 rebar are in a ton?

In short: you would get approximately 150 pieces of 20-foot #4 rebar in a ton.

To determine how many you get in a ton, you need to know the weight of one. Here is a step-by-step process to make this calculation:

  1. Determine the Weight: #4 rebar has a diameter of 1/2 inch (0.5 inches). The weight per linear foot is typically 0.668 pounds.
  2. Calculate the Number of Linear Feet in a Ton: 2000 pounds / 0.668 pounds per foot ≈2995.51 feet
  3. Determine the Length of Each Rebar: If you need the number of individual rebar pieces, you need to know the length of each piece.

For example, if each rebar is 20 feet long:

  1. Calculate the Number of Rebar Pieces in a Ton: Linear Feet per Ton / Length of Each Rebar (in feet)

For a 20-foot rebar:

2995.51 feet / 20 feet ≈149.78 rebars

So, in a ton of #4 rebar, you would get approximately 150 pieces at 20 feet each.

More Rebar Sizes

Weight Per Foot
3/8 inch (or 0.375 inches)
0.376 lbs.
1/2 inch (or 0.5 inches)
0.668 lbs.
5/8 inch (or 0.625 inches)
1.043 lbs.
3/4 inch (or 0.75 inches)
1.502 lbs.
7/8 inch (or 0.875 inches)
2.044 lbs.
1 inch
2.670 lbs.
9/8 inch (or 1.128 inches)
3.400 lbs.
10/8 inch (or 1.27 inches)
4.303 lbs.
11/8 inch (or 1.41 inches)
5.313 lbs.
14/8 inch (or 1.693 inches)
7.650 lbs.
18/8 inch (or 2.257 inches)
13.60 lbs.
    • Dimensions
      A diagram of slab and footing measurements
      • Length
      • Width
      • Edge Clearance
      • Rebar Spacing
      • Rebar Length
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.