How much concrete do I need for a 10x10 slab?

A 10x10 foot slab that's 4 inches thick requires about 1.23 cubic yards of concrete. That's approximately 56 bags of 80lb concrete mix or about $185 for ready-mix delivery.

Should I order extra concrete?

Yes, always order 10% extra to account for spillage, uneven ground, and forms that aren't perfectly level. It's better to have a little extra than to run short mid-pour.

What's the difference between bag concrete and ready-mix?

Bag concrete (like Quikrete) is best for small projects under 1 cubic yard. Ready-mix truck delivery is more economical for larger projects and ensures consistent mixing quality.

How thick should a concrete slab be?

Standard driveways need 4-6 inches, sidewalks need 4 inches, patios need 4 inches, and garage floors need 4-6 inches. Heavy vehicle traffic may require 6-8 inches with reinforcement.

How long does concrete take to cure?

Concrete reaches about 70% strength in 7 days and full strength in 28 days. You can walk on it after 24-48 hours and drive on it after 7 days, but avoid heavy loads for 28 days.

Construction Calculators

Concrete Calculator

Calculate cubic yards or cubic meters of ready-mix concrete needed for slabs, patios, driveways, footings, columns, and construction projects with precise volume estimates. Features bag count calculations for 40lb, 60lb, and 80lb pre-mixed concrete bags, waste factor adjustments, thickness variations, and material cost estimates. Perfect for contractors, DIY homeowners, builders, and construction professionals planning concrete pours, estimating material orders, budgeting projects, and minimizing waste cost-effectively.

How to Use the Concrete Calculator

Use the Concrete Calculator to cubic yards or cubic meters of ready-mix concrete needed for slabs, patios, driveways, footings, columns, and construction projects with precise volume estimates. Features bag count calculations for 40lb, 60lb, and 80lb pre-mixed concrete bags, waste factor adjustments, thickness variations, and material cost estimates. Perfect for contractors, DIY homeowners, builders, and construction professionals planning concrete pours, estimating material orders, budgeting projects, and minimizing waste cost-effectively.. Enter your values to get accurate, instant results tailored to your situation.

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Concrete Project Guide

Get your pour right the first time

Expert Tips

Always Order a Bit Extra: Running short mid-pour is a nightmare. Order more than your calculations suggest to account for spillage, uneven ground, and unexpected issues.
Bags vs Truck Delivery: Small projects work well with bags from the hardware store. Larger projects are more cost-effective with ready-mix delivery. Know the break-even point for your project.
Thickness Matters for Durability: Different applications need different thickness. Driveways need more than sidewalks, and areas with heavy vehicles need even more. Don't skimp—thin concrete cracks.
Ask About the Right Mix: Concrete comes in different strengths. Tell your supplier what you're building and they'll recommend the appropriate mix for your application.
Weather Can Make or Break Your Pour: Moderate temperatures are ideal. Very cold weather prevents proper curing; very hot weather causes it to set too fast. Plan your pour day carefully.

Essential Fundamentals — Calculating concrete needs

How Much Do You Need

Measure Your Space: Multiply length by width by depth to get volume. Our calculator handles the unit conversions to tell you how much to order.
Irregular Shapes: For complex shapes, break them into simpler rectangles or circles, calculate each, then add them together.
Build In a Buffer: Always add extra to your calculated amount. It's much better to have a little left over than to run short during a pour.

Planning Your Budget

Material Costs: Ready-mix delivery is priced per cubic yard. Special options like colored concrete or reinforcement add to the cost.
Don't Forget Prep Work: The concrete itself is often just part of the cost. Site preparation, forms, and finishing labor can add significantly to your total.

Advanced Strategies — Professional results

Pour Day Success

Prepare Everything in Advance: Have all forms, reinforcement, and tools ready before the concrete arrives. Delivery trucks work on tight schedules.
Curing Makes the Difference: Keep fresh concrete moist for several days after pouring. Proper curing dramatically improves strength and prevents cracking.

Frequently Asked Questions

How much concrete do I need for a 10x10 slab?: A 10x10 foot slab that's 4 inches thick requires about 1.23 cubic yards of concrete. That's approximately 56 bags of 80lb concrete mix or about $185 for ready-mix delivery.
Should I order extra concrete?: Yes, always order 10% extra to account for spillage, uneven ground, and forms that aren't perfectly level. It's better to have a little extra than to run short mid-pour.
What's the difference between bag concrete and ready-mix?: Bag concrete (like Quikrete) is best for small projects under 1 cubic yard. Ready-mix truck delivery is more economical for larger projects and ensures consistent mixing quality.
How thick should a concrete slab be?: Standard driveways need 4-6 inches, sidewalks need 4 inches, patios need 4 inches, and garage floors need 4-6 inches. Heavy vehicle traffic may require 6-8 inches with reinforcement.
How long does concrete take to cure?: Concrete reaches about 70% strength in 7 days and full strength in 28 days. You can walk on it after 24-48 hours and drive on it after 7 days, but avoid heavy loads for 28 days.