How Much Does Concrete Weigh? (Per Bag, Yard, and Foot)

Knowing concrete's weight helps you determine if your truck can haul it, whether your subgrade can support it, and how much physical effort your project will require. Use the concrete weight calculator to get exact totals for your dimensions, volume, or bag count.

How Much Does a Yard of Concrete Weigh?

A cubic yard of freshly mixed, normal-weight concrete weighs about 4,050 pounds, roughly 2 tons: 150 lbs per cubic foot × 27 cubic feet. Normal-weight concrete runs about 145-150 lbs per cubic foot, so plan on 3,900-4,050 lbs per yard. Quikrete lists about 140 lbs per cubic foot for its bagged Concrete Mix.

Bag Weights

Bagged concrete comes in standard sizes. The bag weight is the dry mix weight—add water and the mixed concrete weighs more:

When you add water to an 80-lb bag, you're adding roughly 3-4 quarts (about 6-8 lbs), plus the chemical reaction retains most of that water initially. Expect mixed concrete to weigh only about 7-10% more than the dry bag weight.

For bag quantity planning, see our guide on how many bags of concrete you need.

Weight by Volume

Here's a quick reference for concrete weight at different volumes:

A gallon is 0.134 cubic feet, so a gallon of wet concrete is 150 × 0.134 ≈ 20 lbs. Sources: the 150 lb/ft³ normal-weight figure is the standard design value for normal-weight concrete (ACI 318 treats roughly 135-160 lb/ft³ as normal weight); Quikrete's Concrete Mix data sheet (No. 1101) lists about 140 lb/ft³.

Freshly mixed concrete is slightly heavier than cured concrete because some water evaporates during the curing process. The difference is about 2-3%.

Weight Per Square Foot (Slabs)

For slab projects, weight per square foot depends on thickness:

Example: A 10×12 patio at 4 inches thick weighs approximately:

• 120 sqft × 50 lbs = 6,000 pounds

This matters for structural considerations—your subgrade and any supporting structure needs to handle this load plus whatever goes on top (furniture, vehicles, equipment).

Why Concrete Weight Matters

Understanding concrete weight is practical for several reasons:

Transport Planning

A standard half-ton pickup truck (like an F-150) has a payload capacity of about 1,500-2,000 pounds. Here's what that means for hauling bags:

Important: These are weight limits, not space limits. Don't overload your vehicle—concrete bags are dense and heavy.

Structural Load

When pouring concrete over a deck, bridge, or elevated surface, the structure must support the concrete's weight. A 4-inch slab weighs 50 lbs per square foot—a 100 sqft section adds 5,000 lbs of dead load before you add anything else.

Physical Effort

Mixing concrete is hard work. An 80-lb bag requires lifting, pouring, and mixing material that weighs about 86 lbs when wet. Plan accordingly:

• Have helpers for projects requiring 20+ bags
• Use 60-lb bags if you have back concerns
• Consider ready-mix for large projects

For volume context, see our guide on what a yard of concrete actually is.

Wet vs Dry/Cured Weight

A common question: does concrete get lighter when it dries?

Short answer: Slightly, but not much.

The details: Concrete curing is a chemical reaction (hydration), not simply drying. The water bonds chemically with the cement rather than evaporating entirely. Cured concrete loses about 2-3% of its initial weight—not enough to matter for most practical purposes.

For calculation purposes, use 150 lbs per cubic foot or 4,050 lbs per cubic yard (150 × 27). The variation isn't significant enough to change your planning.

Lightweight Concrete

Standard concrete weighs 140-150 lbs per cubic foot. Lightweight concrete options exist for specific applications:

Lightweight concrete uses expanded shale, clay, or other lightweight aggregates instead of standard gravel. It's more expensive and typically used only where weight reduction is critical.

Calculating Weight for Your Project

To estimate your project's concrete weight:

1. Calculate volume in cubic feet (Length × Width × Thickness)
2. Multiply by 150 lbs per cubic foot

Example: 12×10 patio, 4 inches thick

• Volume: 12 × 10 × 0.33 = 39.6 cubic feet
• Weight: 39.6 × 150 = 5,940 lbs

Use our concrete calculator to determine volume, then multiply by 150 for weight. For step-by-step calculation guidance, see how to calculate concrete.

Concrete Weight by Slab Size

Running the math on common residential slab footprints at a standard 4-inch thickness and normal-weight (150 lb/ft³) mix:

At 6 inches thick, multiply the area by 75 lbs instead of 50; at 8 inches, multiply by 100 lbs. For an exact figure on your own footprint and thickness, use the concrete weight calculator.

Weight of Broken Concrete for Disposal

Demolished concrete weighs the same total as the slab it came from — breaking it up doesn't remove mass, it just redistributes it into rubble. What changes is volume: irregular chunks with air gaps between them take up roughly 1.3-1.5 times the volume of the solid slab, so a demolished 10×10×4-inch slab (about 33 cu ft solid, 5,000 lbs) becomes closer to 43-50 cu ft of loose rubble at the same weight.

That distinction matters for disposal budgeting. Rental dumpsters are billed and capped by weight, not just box volume. A general-debris container's weight allowance is often far below what its box could physically hold if filled with dense concrete, so a mid-size demolition job can hit the cap before the dumpster looks full. That is why concrete debris usually goes in a dedicated heavy-debris (clean concrete) container, or in multiple hauls, rather than a single standard dumpster. Budget disposal weight from your original slab's dimensions (via the concrete weight calculator), not from eyeballing the rubble pile. See our concrete removal and demolition guide for the full disposal process.

Key Takeaways

• Concrete weighs ~150 lbs per cubic foot or ~4,050 lbs per cubic yard
• An 80-lb bag yields about 0.6 cubic feet and weighs ~86 lbs when mixed
• A 4-inch slab weighs ~50 lbs per square foot
• Cured concrete is only 2-3% lighter than wet concrete
• Check your truck's payload capacity before hauling bags

For material decisions, see our guide on ready-mix vs bagged concrete. For more fundamentals, visit our concrete basics guide or browse all concrete guides.