Rebar Weight Calculator

Last updated: 13 Sep 2026 | Author: Brij | Review By: Irshad

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Estimate single and total rebar weight using bar length, diameter, quantity, and steel density for construction and material planning.

Length of Rebar:

Diameter of Rebar:

Number of Rebars:

Result

Weight of one rebar:

Total Weight of Rebars :

A Rebar Weight Calculator helps you estimate the weight of one reinforcing bar and the combined weight of multiple rebars. Enter the rebar length, diameter, and quantity to calculate the total steel weight for your project.

This estimate is useful for ordering materials, transport planning, handling, budgeting, and construction preparation.

What Information Is Needed?

To calculate rebar weight, enter:

Rebar length
Rebar diameter
Number of rebars
Steel density, if required by the calculator

For accurate results, use compatible units. For example, if the rebar length is measured in metres, convert the diameter to metres before calculating volume.

Steel Density Used for Rebar Weight

Steel density is commonly estimated at approximately 7,850 kilograms per cubic metre.

$\text{Steel Density} = 7850\text{ kg/m}^{3}$

When using imperial units, steel density is commonly estimated at approximately 490 pounds per cubic foot.

$\text{Steel Density} = 490\text{ lb/ft}^{3}$

Calculate the Volume of One Rebar

A rebar is cylindrical, so its volume is calculated using the cylinder-volume formula.

$\text{Volume of One Rebar} = \pi \times \left(\frac{\text{Diameter}}{2}\right)^2 \times \text{Length}$

If the diameter is measured in millimetres, convert it to metres before calculating.

$\text{Diameter in Metres} = \frac{\text{Diameter in Millimetres}}{1000}$

Calculate the Weight of One Rebar

Multiply the volume of one rebar by the density of steel.

$\text{Weight of One Rebar} = \text{Volume of One Rebar} \times \text{Steel Density}$

Calculate the Total Rebar Weight

Multiply the weight of one rebar by the total quantity of rebars.

$\text{Total Rebar Weight} = \text{Weight of One Rebar} \times \text{Quantity}$

Combined Rebar Weight Formula

You can combine the volume and weight calculations into one formula.

$\text{Total Rebar Weight} = \pi \times \left(\frac{\text{Diameter}}{2}\right)^2 \times \text{Length} \times \text{Steel Density} \times \text{Quantity}$

Example Rebar Weight Calculation

Suppose you have the following rebar details:

Rebar diameter: 12 mm
Rebar length: 6 m
Quantity: 10 bars
Steel density: 7,850 kg/m³

Step 1: Convert Diameter to Metres

$\text{Diameter} = \frac{12\text{ mm}}{1000} = 0.012\text{ m}$

Step 2: Calculate the Volume of One Rebar

$\text{Volume of One Rebar} = \pi \times \left(\frac{0.012}{2}\right)^2 \times 6$

$\text{Volume of One Rebar} = 0.000679\text{ m}^{3}$

Step 3: Calculate the Weight of One Rebar

$\text{Weight of One Rebar} = 0.000679\text{ m}^{3} \times 7850\text{ kg/m}^{3}$

$\text{Weight of One Rebar} = 5.33\text{ kg}$

Step 4: Calculate the Total Rebar Weight

$\text{Total Rebar Weight} = 5.33\text{ kg} \times 10 = 53.3\text{ kg}$

The estimated total weight of 10 rebars is 53.3 kilograms.

Important Notes

Use the actual rebar diameter for the most accurate result.
Ensure the length and diameter use compatible measurement units.
The calculation estimates steel weight only.
Add extra material for cutting, bends, hooks, laps, and normal site waste.
Confirm final bar schedules and quantities with the project drawings or a qualified engineer.

Frequently Asked Questions

How is rebar weight calculated?

Rebar weight is calculated by finding the volume of the cylindrical bar and multiplying it by steel density.

What density is used for rebar?

A common estimate for steel density is 7,850 kg/m³ or approximately 490 lb/ft³.

Can I calculate the weight of one rebar?

Yes. Enter a quantity of 1 to calculate the weight of a single rebar.

Can I calculate rebar weight per metre?

Yes. Enter a rebar length of 1 metre and a quantity of 1 to estimate the rebar weight per metre.

Does the calculator include bends and cutting waste?

No. Add extra length or weight for bends, hooks, lap splices, cutting loss, and site waste.

Can I use the calculator for different rebar diameters?

Yes. Enter the actual diameter and length for each rebar size, then calculate each size separately.

Is the calculated rebar weight exact?

The result is an estimate. Actual weight may vary slightly by manufacturer, bar profile, coating, and measurement accuracy.

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