Concrete Weight
Calculate the weight of concrete by volume using length, width, depth, and concrete type. Get results in pounds, kilograms, and metric tons instantly.
About This Calculator
The Concrete Weight Calculator helps contractors, engineers, DIYers, and architects estimate the weight of concrete for any slab, footing, or structure. Knowing concrete weight is essential for formwork design, crane capacity planning, transportation logistics, and structural load calculations.
The calculator uses the formula: Weight = Volume × Density. Volume is computed from your length, width, and depth inputs (converting to cubic feet or cubic meters). The density depends on the concrete type you select — from standard Portland concrete at 2,300 kg/m³ to reinforced concrete at 2,500 kg/m³. Results are displayed in pounds (lbs), kilograms (kg), and metric tons.
Five concrete types are supported: Asphalt (used for roads and parking lots), Gravel aggregate, Portland-Limestone (a popular eco-friendly blend), standard Portland, and Reinforced concrete with steel rebar. Each has a distinct density derived from standard engineering references.
Regional Notes
United States: Concrete weight is typically measured in pounds per cubic foot (lb/ft³). Ready-mix concrete is ordered by cubic yard. A standard 4-inch slab weighs about 50 lbs per square foot.
United Kingdom: Concrete weight is measured in kilograms per cubic meter (kg/m³) or metric tonnes. Ready-mix is ordered by cubic metre. Standard C25/30 concrete has a density of approximately 2,400 kg/m³.
India: Concrete weight is expressed in kg/m³. M20 grade concrete has an approximate density of 2,400 kg/m³. Reinforced cement concrete (RCC) is widely used and weighs around 2,500 kg/m³.
Frequently Asked Questions
How do you calculate concrete weight?
Concrete weight is calculated by multiplying the volume of concrete by its density. The formula is: Weight = Volume × Density. For standard Portland concrete at 2300 kg/m³ (143.58 lb/ft³), a slab measuring 10 ft × 10 ft × 4 in has a volume of 33.33 ft³ and weighs approximately 4,786 lbs or 2,171 kg.
What is the weight of concrete per cubic foot?
The weight of concrete per cubic foot depends on the type: Asphalt concrete weighs 140.03 lb/ft³ (2,243 kg/m³), standard Portland concrete weighs 143.58 lb/ft³ (2,300 kg/m³), and reinforced concrete weighs 156.07 lb/ft³ (2,500 kg/m³).
How much does a cubic yard of concrete weigh?
A cubic yard of standard Portland concrete weighs about 3,877 lbs (1,758 kg). A cubic yard of reinforced concrete weighs approximately 4,214 lbs (1,912 kg). These values assume standard densities and may vary slightly with mix design and moisture content.
What are the different types of concrete and their densities?
The five common concrete types covered in this calculator are: Asphalt (140.03 lb/ft³ / 2,243 kg/m³), Gravel (150.01 lb/ft³ / 2,404 kg/m³), Portland-Limestone (148.02 lb/ft³ / 2,371 kg/m³), Portland (143.58 lb/ft³ / 2,300 kg/m³), and Reinforced (156.07 lb/ft³ / 2,500 kg/m³).
What is lightweight concrete?
Lightweight concrete, also called structural low-density concrete, is made using lightweight aggregates such as clay, shale, or volcanic rock. Its density ranges from 70 to 120 lb/ft³ (1,120 to 1,920 kg/m³). It is used for high-rise buildings, bridges, and decks where reducing structural load is important.
How much does reinforced concrete weigh compared to standard concrete?
Reinforced concrete (RCC) weighs approximately 156.07 lb/ft³ (2,500 kg/m³), which is about 9% heavier than standard Portland concrete at 143.58 lb/ft³ (2,300 kg/m³). The additional weight comes from steel reinforcing bars embedded within the concrete matrix.
Is concrete weight the same in the US, UK, and India?
Yes, the density of concrete is a material property that does not vary by country. However, units differ: the US typically measures concrete weight in pounds per cubic foot (lb/ft³), the UK uses kilograms per cubic meter (kg/m³) or metric tons, and India commonly uses kg/m³ as well. This calculator provides all three unit systems.
How accurate is the concrete weight formula?
The Weight = Volume × Density formula is highly accurate for estimating concrete weight. Real-world variation of 2-5% may occur due to moisture content, aggregate type, mix design, and compaction. For precise structural engineering, always consult the concrete mix design specifications from your supplier.