Concrete Weight Calculator

Updated Aug 31, 2026 By Jehan Wadia

Introduction

The Concrete Weight Calculator helps you find out how much your concrete weighs. Just enter the size of your slab, footing, or any concrete shape, and the tool does the math for you. You can type in the volume directly, use area and depth, or enter length, width, and depth. It works with both US and metric units. You can also pick from seven concrete types, like standard, lightweight, or reinforced, and the calculator adjusts the density for you. If you're working with broken concrete or rubble, switch to rubble mode and the tool cuts the density in half to account for air gaps. The results show weight in pounds, kilograms, and tons, plus full volume conversions and helpful charts.

How to Use Our Concrete Weight Calculator

Enter your concrete dimensions and settings below. The calculator will instantly show you the total weight in pounds, kilograms, and tons, plus full volume conversions.

Dimensions Tab: Pick how you want to enter your concrete size. Choose "Volume" if you already know the cubic feet or cubic yards. Choose "Area + Depth" if you know the surface area and thickness. Choose "L × W × D" to type in length, width, and depth separately. Choose "Sq Ft Quick" if you just know the square footage and slab thickness in inches.

Volume: Type the total volume of your concrete and select the unit from the dropdown. You can use cubic inches, cubic feet, cubic yards, cubic centimeters, or cubic meters.

Area + Depth: Type the surface area in the first box and pick your unit. Then type the depth or thickness in the second box and pick its unit. The calculator will multiply them to get the volume.

Length × Width × Depth: Type each measurement in its own box. You can mix units across all three fields. For example, use feet for length and width but inches for depth.

Sq Ft Quick: Type your area in square feet and your slab thickness in inches. This is the fastest option for standard concrete slabs.

Concrete Type: Select the type of concrete you are using. Each type has a different density. Options include Standard Portland, Lightweight, High-Density, Asphalt, Gravel, Limestone, and Reinforced concrete.

Concrete State: Choose "Solid / Intact" for poured or cured concrete. Choose "Broken / Rubble" for demolished concrete. Rubble weighs about half as much as solid concrete because of air gaps between the pieces.

Density: This field auto-fills based on your concrete type and state. You can type in a custom density in pounds per cubic foot if you know the exact value. The bar below shows where your density falls within the typical range.

Calculate Button: Press "Calculate" to see your results. The calculator shows weight in pounds, kilograms, US tons, metric tonnes, ounces, and grams. It also shows volume in cubic feet, cubic yards, cubic inches, cubic meters, cubic centimeters, and liters.

Reset Button: Press "Reset" to clear all fields and return every setting to its default value.

What Is a Concrete Weight Calculator?

A concrete weight calculator helps you figure out how heavy a slab, block, or any amount of concrete will be. You enter the size of your concrete — either as a volume, an area with thickness, or length × width × depth — and the calculator tells you the total weight in pounds, kilograms, and tons.

Why Does Concrete Weight Matter?

Knowing the weight of concrete is important for construction projects of all sizes. You need it to plan how much a truck can carry, whether a floor or structure can support the load, and how much material to order. A standard concrete slab that is 10 feet by 10 feet and 4 inches thick weighs close to 5,000 pounds. That is a lot of weight, so getting the number right matters.

How Much Does Concrete Weigh?

The weight of concrete depends on its type and density. Standard concrete weighs about 137 to 156 pounds per cubic foot. Lightweight concrete weighs 87 to 115 pounds per cubic foot. High-density concrete can weigh 175 to 250 pounds per cubic foot. Reinforced concrete, which has steel bars inside, weighs about 150 to 165 pounds per cubic foot.

Solid vs. Broken Concrete

Broken concrete, also called rubble, weighs less per cubic foot than solid concrete. This is because rubble has air gaps between the pieces. A good rule of thumb is that rubble weighs about 50% less than the same volume of solid concrete. This matters when you are hauling away demolished concrete or filling a dumpster.

Common Concrete Types

Standard / Portland Concrete — The most common type used for sidewalks, driveways, and foundations.
Lightweight Concrete — Used where lower weight is needed, like upper floors of buildings.
High-Density Concrete — Used for radiation shielding and counterweights.
Asphalt Concrete — Used for roads and parking lots.
Gravel Concrete — Uses gravel as the main aggregate.
Limestone with Portland — A mix that uses crushed limestone.
Reinforced Concrete — Standard concrete with steel rebar added for extra strength.

Quick Reference: Concrete Weight Per Cubic Foot

One cubic foot of standard concrete weighs about 146 pounds. One cubic yard (27 cubic feet) weighs roughly 3,950 pounds, or just under 2 US tons. These numbers give you a fast way to estimate weight on the job site without a calculator.

Formulas used

Concrete Weight

W_{\text{lb}} = V_{\text{ft}^3} \times \rho_{\text{lb/ft}^3}

Volume from Area and Depth

V_{\text{ft}^3} = A_{\text{ft}^2} \times D_{\text{ft}}

Volume from Length, Width, and Depth

V_{\text{ft}^3} = L_{\text{ft}} \times W_{\text{ft}} \times D_{\text{ft}}

Rubble Density Adjustment

\rho_{\text{rubble}} = 0.5 \times \rho_{\text{solid}}

Weight in Kilograms

W_{\text{kg}} = W_{\text{lb}} \times 0.453592

Weight in US Tons

W_{\text{US tons}} = \frac{W_{\text{lb}}}{2000}

Frequently asked questions

How much does 1 cubic foot of concrete weigh?

One cubic foot of standard concrete weighs about 146 pounds (66 kg). This number can range from 137 to 156 pounds per cubic foot depending on the exact mix. Lightweight concrete weighs less, around 87 to 115 pounds per cubic foot.

How much does a cubic yard of concrete weigh?

A cubic yard of standard concrete weighs about 3,950 pounds, or just under 2 US tons. A cubic yard equals 27 cubic feet. For lightweight concrete, a cubic yard weighs around 2,700 to 3,100 pounds.

What density should I use for my concrete?

The calculator picks a default density based on the concrete type you select. For standard concrete, it uses 146.5 lb/ft³. You can change this number if you know the exact density of your mix. Check your concrete supplier's data sheet for the most accurate value.

Why does rubble weigh less than solid concrete?

Broken concrete has air gaps between the pieces. These gaps take up space but add no weight. Because of this, rubble weighs about half as much as the same volume of solid concrete. The calculator cuts the density by 50% when you select rubble mode.

How do I calculate the weight of a concrete slab?

Use the Sq Ft Quick tab. Enter your slab's area in square feet and the thickness in inches. A common slab is 4 inches thick. Press Calculate, and the tool shows the weight in pounds, kilograms, and tons.

What is the difference between US tons and metric tonnes?

A US ton (short ton) is 2,000 pounds. A metric tonne is 1,000 kilograms, which equals about 2,205 pounds. A metric tonne is slightly heavier than a US ton. The calculator shows both so you can use whichever your project requires.

How much does a 4-inch thick concrete slab weigh per square foot?

A 4-inch thick standard concrete slab weighs about 48.8 pounds per square foot. This comes from multiplying the density (146.5 lb/ft³) by the thickness (4 inches = 0.333 feet).

What is lightweight concrete used for?

Lightweight concrete is used where less weight is needed. Common uses include upper floors of buildings, roof decks, and insulating walls. It weighs 87 to 115 pounds per cubic foot, which is about 30% to 40% lighter than standard concrete.

What is high-density concrete?

High-density concrete uses heavy aggregates like barite or magnetite. It weighs 175 to 250 pounds per cubic foot. It is used for radiation shielding in hospitals, nuclear plants, and for counterweights in construction.

Does reinforced concrete weigh more than standard concrete?

Yes. Reinforced concrete has steel rebar inside, which makes it heavier. It weighs about 150 to 165 pounds per cubic foot, compared to 137 to 156 for standard concrete. The steel adds roughly 5% to 10% more weight.

How do I find the volume of my concrete if I only know the weight?

Divide the weight in pounds by the density in pounds per cubic foot. For standard concrete, divide by 146.5. For example, 5,000 pounds divided by 146.5 equals about 34.1 cubic feet.

How many bags of concrete do I need based on weight?

A standard 80-pound bag of concrete mix yields about 0.6 cubic feet when mixed. Divide your total volume in cubic feet by 0.6 to get the number of bags. For example, 33 cubic feet needs about 55 bags.

Why does the density bar change when I switch concrete types?

Each concrete type has a different density range. The bar shows where your current density falls within that range. When you switch types, the range and default density update to match the new type.

Can a concrete truck carry a full load of high-density concrete?

A standard concrete truck holds about 10 cubic yards. High-density concrete at 250 lb/ft³ would weigh about 67,500 pounds for 10 cubic yards. Most trucks have a weight limit of 40,000 to 44,000 pounds, so you would need to order a partial load or use multiple trucks.