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Concrete is incredibly heavy. Use this calculator to determine the exact weight, total cubic yards, and required bag count for your next patio, footing, or flatwork project.
Last updated: March 3, 2026
Safety Warning: A single cubic yard of concrete weighs roughly 4,000 lbs. Do not attempt to haul a full buggy or trailer of wet mix without verifying your vehicle's legally rated payload and towing capacity.
Concrete weight is the total mass of your pour based on its volume and density. Knowing this number helps you avoid overloaded trucks, under-ordered materials, and costly delays. For patios, slabs, footings, and post holes, accurate weight estimates are essential for planning labor, delivery, site access, and structural load safety.
Standard concrete is usually around 150 lb/ft^3. Lightweight mixes range around 90-115 lb/ft^3, while heavy-duty structural mixes can run higher than standard. Small density differences create large weight changes on bigger pours.
Volume (ft^3) = Length (ft) x Width (ft) x Thickness (ft)
Concrete Weight (lb) = Volume (ft^3) x Density (lb/ft^3)
Cubic Yards = Volume (ft^3) / 27
80 lb Bags Needed = Total Weight (lb) / 80 (add 5-10% waste)
Variables in plain language: length and width are your slab dimensions, thickness is the pour depth converted to feet, and density is how heavy one cubic foot of your chosen mix is. The calculator handles all unit conversions automatically.
12 ft x 10 ft x 4 in slab
Volume: 40 ft^3 (1.48 yd^3)
Weight: ~6,000 lb
8 holes, 12 in dia x 30 in deep
Volume: 15.7 ft^3 (0.58 yd^3)
Weight: ~2,355 lb
16 ft x 12 ft x 5 in slab
Volume: 80 ft^3 (2.96 yd^3)
Weight: ~12,000 lb
Use this quick table to compare common slab thicknesses for a 10 ft x 10 ft area using standard 150 lb/ft^3 concrete.
| Thickness | Volume (ft^3) | Volume (yd^3) | Est. Weight (lb) | 80 lb Bags |
|---|---|---|---|---|
| 3 in | 25.0 | 0.93 | 3,750 | 47 |
| 4 in | 33.3 | 1.23 | 5,000 | 63 |
| 5 in | 41.7 | 1.54 | 6,250 | 79 |
| 6 in | 50.0 | 1.85 | 7,500 | 94 |
Same slab comparison in Markdown format for quick sharing with contractors, crews, or project notes.
| Thickness | Volume (ft^3) | Volume (yd^3) | Est. Weight (lb) | 80 lb Bags | | --- | --- | --- | --- | --- | | 3 in | 25.0 | 0.93 | 3,750 | 47 | | 4 in | 33.3 | 1.23 | 5,000 | 63 | | 5 in | 41.7 | 1.54 | 6,250 | 79 | | 6 in | 50.0 | 1.85 | 7,500 | 94 |
Share this tool with someone planning a backyard patio, fence post pour, or shed foundation so they don't break their truck's suspension.
Suggested hashtags: #DIY #Concrete #Construction #HomeImprovement