Concrete Calculator

Q: Ready-mix vs bagged concrete: Which is better?

Bagged: Best for < 1 cubic yard (< 45 bags). Ready-mix: More economical for 1+ cubic yards, faster, more consistent. Break-even is typically around 1 cubic yard. Factor in your time mixing bags. - Ready-mix minimum: Usually 1 yard (some do 0.5 yard) - Ready-mix: Order exact PSI strength you need - Saturday delivery: Often extra charge - Have helpers ready - concrete waits for no one!

Q: What PSI concrete do I need?

2500 PSI: Residential footings. 3000 PSI: Driveways, patios (most common). 4000 PSI: Commercial, heavy traffic. 5000+ PSI: Industrial. Standard bagged concrete is 3000-4000 PSI. Higher PSI = stronger but more expensive. - 3000 PSI is standard for most residential - Freeze-thaw areas: Consider 4000 PSI + air entrainment - Bagged concrete: Usually 3000-4000 PSI - PSI develops over 28 days (reaches 70% in 7 days)

Calculate concrete for any project

Units

Total Concrete Needed

1.36 yd³

Bags

Cost

$341

Weight

2.8 T

Length (ft)

Width (ft)

Depth (in)

Number of identical pours

Mix Type

Bag Size

Add Rebar

Wire Mesh

Waste Factor10%

5%10% typical20%

Delivery Fee

Volume

1.36 yd³

Bags Needed

Weight

2.8 tons

Est. Cost

$341

Volume Breakdown

Raw Volume1.23 yd³

+ Waste0.12 yd³

Total Needed1.36 yd³

80 lb bag62 bags

Truck Loads (9 yd³)1

Cost Breakdown

Concrete$341

Total$341

What You'll Need

As an Amazon Associate, we earn from qualifying purchases.

How This Calculator Works

Volume calculations follow Portland Cement Association standards. Includes 10% waste factor recommendation per industry best practice.

Sources: Portland Cement Association, International Building Code (IBC)

Frequently Asked Questions

How do I calculate how much concrete I need?

Volume = Length × Width × Thickness. Convert to cubic yards: Volume (cu ft) ÷ 27 = cubic yards. Example: 10ft × 10ft × 4in slab = 100 sq ft × 0.33 ft = 33 cu ft ÷ 27 = 1.22 cubic yards.

Formula: L × W × Thickness (in feet) = cubic feet
Convert to yards: Cubic feet ÷ 27 = cubic yards
4 inch slab: Multiply sq ft × 0.33 ft ÷ 27
6 inch slab: Multiply sq ft × 0.50 ft ÷ 27
Always round UP and add 5-10% waste

Slab Thickness	Sq Ft per Cubic Yard	Example: 100 sq ft
4 inches	81 sq ft	1.23 cubic yards
5 inches	65 sq ft	1.54 cubic yards
6 inches	54 sq ft	1.85 cubic yards
8 inches	40 sq ft	2.47 cubic yards

How many bags of concrete do I need?

One cubic yard = 45 bags (80 lb) or 60 bags (60 lb) or 90 bags (40 lb). For small projects: 80 lb bag covers 0.6 cu ft, 60 lb bag covers 0.45 cu ft. Bagged concrete is cost-effective under 1 cubic yard.

< 1 cubic yard: Bags are usually more practical
> 1 cubic yard: Ready-mix truck is more economical
80 lb bags: Best value per cubic foot
Quikrete vs Sakrete: Similar performance, compare prices

Bag Size	Yield (cu ft)	Bags per Cu Yard	Best For
40 lb	0.30 cu ft	90 bags	Small repairs
60 lb	0.45 cu ft	60 bags	Posts, small projects
80 lb	0.60 cu ft	45 bags	Most DIY projects

How thick should my concrete slab be?

Driveway: 4-6 inches. Patio/sidewalk: 4 inches. Garage floor: 4-6 inches. Heavy equipment: 6-8 inches. Footings: Local code (often 8-12 inches). Thicker = stronger but more expensive. Rebar adds strength without extra thickness.

Add wire mesh or rebar for crack prevention
Thicker edges for driveways (6" apron)
Check local building codes for requirements
Proper base preparation is as important as thickness

Application	Minimum Thickness	Recommended	Notes
Sidewalk	3.5"	4"	Light foot traffic
Patio	4"	4"	Furniture, foot traffic
Driveway (cars)	4"	4-5"	Regular vehicles
Driveway (trucks/RV)	5"	6"	Heavy vehicles
Garage floor	4"	4-6"	Depends on vehicles
Shed foundation	4"	4"	Light structures

Should I order extra concrete?

Yes! Order 5-10% extra for waste, spillage, and uneven subgrade. Better to have a little extra than to run short mid-pour. Ready-mix has minimums (often 1 yard). Leftover can be used for stepping stones or small projects.

5% extra: Simple flat slabs with good forms
10% extra: Uneven ground, complex shapes
15% extra: Slopes, irregular edges
Running short mid-pour = disaster (cold joints)
Leftover concrete: Stepping stones, small repairs

Ready-mix vs bagged concrete: Which is better?

Bagged: Best for < 1 cubic yard (< 45 bags). Ready-mix: More economical for 1+ cubic yards, faster, more consistent. Break-even is typically around 1 cubic yard. Factor in your time mixing bags.

Ready-mix minimum: Usually 1 yard (some do 0.5 yard)
Ready-mix: Order exact PSI strength you need
Saturday delivery: Often extra charge
Have helpers ready - concrete waits for no one!

Factor	Bagged Concrete	Ready-Mix Truck
Best for	< 1 cubic yard	1+ cubic yards
Cost per yard	$100-150	$150-200 + delivery
Labor	You mix each bag	Truck pours
Quality	Variable	Consistent
Time	Hours of mixing	Poured in minutes

What PSI concrete do I need?

2500 PSI: Residential footings. 3000 PSI: Driveways, patios (most common). 4000 PSI: Commercial, heavy traffic. 5000+ PSI: Industrial. Standard bagged concrete is 3000-4000 PSI. Higher PSI = stronger but more expensive.

3000 PSI is standard for most residential
Freeze-thaw areas: Consider 4000 PSI + air entrainment
Bagged concrete: Usually 3000-4000 PSI
PSI develops over 28 days (reaches 70% in 7 days)

PSI Rating	Use Cases	Cost
2500 PSI	Footings, foundations	Lowest
3000 PSI	Driveways, sidewalks, patios	Standard
3500 PSI	Driveways with heavy vehicles	Moderate
4000 PSI	Commercial, garage floors	Higher
5000+ PSI	Industrial, freeze-thaw areas	Highest

Find a Contractor Near You

Get free quotes from licensed contractors in your area

Angi4.7/5

Verified reviews & background checks

Get Free Quotes

Showing results for your area

Example Calculations

1Standard Patio Slab (10×10 ft)

Inputs

Length10 ft

Width10 ft

Thickness4 inches

Result

Concrete Needed1.23 cubic yards

80 lb Bags56 bags

With 10% Waste1.35 cubic yards

A 100 sq ft patio at 4" thick requires about 1.23 yards. Order 1.5 yards from ready-mix or 56 bags.

2Two-Car Driveway

Inputs

Length20 ft

Width18 ft

Thickness5 inches

Result

Concrete Needed5.56 cubic yards

With 10% Waste6.1 cubic yards

RecommendationOrder ready-mix

At 5" thick for vehicles, a 360 sq ft driveway needs ~6 yards. Ready-mix is the only practical option.

3Fence Post Holes (10 posts)

Inputs

Posts10

Hole Diameter10 inches

Hole Depth24 inches

Result

Concrete per Post0.58 cu ft

Total for 10 Posts5.8 cu ft

80 lb Bags Needed10 bags

For fence posts, use 1 bag (80 lb) per post hole. Bagged concrete is perfect for this application.

Show all examples

Formulas Used

Concrete Volume (Rectangular)

Volume = Length × Width × Thickness

Basic formula for slabs, patios, and driveways.

Where:

Length= Length in feet

Width= Width in feet

Thickness= Thickness in feet (divide inches by 12)

Source: Portland Cement Association

Cubic Feet to Cubic Yards

Cubic Yards = Cubic Feet ÷ 27

Convert volume to ordering units (1 cubic yard = 27 cubic feet).

Cylinder Volume (Posts/Footings)

Volume = π × radius² × depth

For round holes like fence posts and tube footings.

Show all formulas

Complete Guide to Concrete Estimation and Ordering

Square Feet per Cubic Yard by Slab Thickness

One cubic yard of concrete covers 81 square feet at 4 inches thick — this single number is the most useful shortcut for quick estimation. For a 5-inch driveway slab, coverage drops to 65 sq ft/yd; at 6 inches, just 54 sq ft/yd. Memorizing these figures lets you sanity-check any estimate in seconds.

The math is straightforward: 1 cubic yard = 27 cubic feet, so coverage = 27 ÷ (thickness in feet). At 4 inches (0.333 ft), that is 27 ÷ 0.333 = 81 sq ft. Always add 5–10% for waste from spillage, uneven subgrade, and forms that bow under pressure during the pour.

For irregular shapes like curved patios or L-shaped driveways, break the area into rectangles, calculate each separately, and sum the totals. Use the concrete footing calculator for cylindrical post holes, which require the cylinder volume formula instead.

Slab Thickness	Sq Ft per Cubic Yard	Common Application
4 inches	81 sq ft	Patios, sidewalks, shed pads
5 inches	65 sq ft	Residential driveways
6 inches	54 sq ft	Heavy-vehicle driveways, garage floors
8 inches	40 sq ft	Commercial slabs, equipment pads

Quick check: Divide your total square footage by the coverage number above. A 400 sq ft driveway at 5 inches = 400 ÷ 65 = 6.15 cubic yards before waste.

Bagged Concrete vs. Ready-Mix Truck Delivery

For projects under 1 cubic yard (roughly 45 bags of 80-lb mix), bagged concrete from a home center is the most practical option at $5–$6 per bag, totaling $225–$270 per cubic yard of material. Above 1 cubic yard, a ready-mix truck delivery at $150–$200 per yard plus a $50–$100 delivery fee becomes far more economical and saves hours of hand-mixing labor.

An 80-lb bag yields 0.60 cubic feet of mixed concrete; a 60-lb bag yields 0.45 cu ft. You need 45 bags (80 lb) or 60 bags (60 lb) to make one full cubic yard. At 80 lbs per bag, mixing just one cubic yard means lifting and mixing 3,600 lbs of dry material — a full day of backbreaking work versus a 10-minute truck pour.

Ready-mix trucks typically have a 1-yard minimum order, with some suppliers offering half-yard minimums at a premium. Order 5–10% more than your calculated volume — running short mid-pour creates cold joints (weak seams) that compromise the slab’s structural integrity and cannot be repaired after the fact.

Factor	Bagged (80 lb)	Ready-Mix Truck
Best for	Under 1 cu yd	1+ cu yd
Cost per cu yd	$225–$270	$150–$200 + delivery
Bags per cu yd	45 bags	N/A
Mix time per yd	4–6 hours hand-mix	10 minutes
Consistency	Variable	Plant-batched, uniform

Tip: Most ready-mix plants charge $1–$2 per minute for wait time beyond 5–7 minutes per yard. Have your forms, rebar, and helpers ready before the truck arrives.

Slab Thickness Guide by Application

A standard 4-inch patio slab handles foot traffic, patio furniture, and grills with a 3,000 PSI mix — the most common residential pour. Driveways should be 4–6 inches depending on vehicle weight: 4 inches suffices for passenger cars, but 5–6 inches is necessary for trucks, SUVs, or RVs that impose 2–3× the point load.

Garage floors follow the same 4–6-inch range, with 6 inches recommended if you plan to park heavy vehicles or install a car lift. Thickened edges (6–8 inches) at the driveway apron where it meets the street prevent cracking from the repeated stress of vehicles driving on and off.

Footings and foundations have their own thickness requirements set by local building codes, typically 8–12 inches for residential strip footings. The concrete expansion joint calculator helps plan joint spacing for any slab thickness to control cracking, while the concrete countertop calculator covers the specialty 1.5–3-inch pours used for indoor countertops.

PSI ratings assume standard residential loads; verify with local building codes
Application	Thickness	PSI Rating	Reinforcement
Patio/sidewalk	4 in.	3,000	Wire mesh or fiber
Driveway (cars)	4–5 in.	3,000–3,500	Wire mesh
Driveway (trucks/RV)	5–6 in.	3,500–4,000	Rebar #3 @ 18 in.
Garage floor	4–6 in.	3,000–4,000	Wire mesh or rebar
Footings (residential)	8–12 in.	2,500–3,000	Rebar per code

Reinforcement, Subgrade Prep, and Pouring Tips

Welded wire mesh (6×6 W1.4/W1.4) costs $3–$5 per 5×10-foot sheet and is the most common reinforcement for residential slabs 4–6 inches thick. For driveways expecting heavy loads, #3 rebar on 18-inch centers provides significantly more tensile strength and is required by many building codes for slabs over 5 inches.

Subgrade preparation accounts for 90% of long-term slab performance. Compact the soil to 95% density (rent a plate compactor for $50–$75/day), add a 4-inch layer of compacted gravel base, and lay 6-mil polyethylene vapor barrier to block ground moisture. Skipping the gravel base is the most common DIY mistake and leads to settling cracks within 1–2 years.

Pour concrete starting at the far corner and work toward the exit point. Strike off with a screed board, then bull-float the surface within 10 minutes to push aggregate down and bring cream to the top. Wait until bleed water disappears (30–60 minutes in warm weather) before finishing with a steel trowel or broom texture.

Never pour on frozen ground or into standing water. Concrete placed below 50°F requires insulated blankets for 48+ hours; above 90°F, mist-cure and shade to prevent rapid drying and surface cracking.

Wire mesh: $3–$5 per sheet, adequate for patios and light-duty slabs
Rebar #3 @ 18 in.: $0.50–$0.75 per linear foot, required for driveways over 5 in.
Fiber reinforcement: $8–$12 per bag additive, reduces surface cracking but not structural
Gravel base: 4 in. compacted, $25–$40 per cubic yard delivered
Vapor barrier: 6-mil poly, $0.10–$0.15 per sq ft, prevents moisture migration

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Related Resources

How Much Concrete Do I Need? Concrete Calculator for Slabs & Footings

Read our guide

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Read our guide

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Last Updated: Mar 26, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

UseCalcPro

Concrete Calculator

Calculate concrete for any project

Units

Total Concrete Needed

1.36 yd³

Bags

Cost

$341

Weight

2.8 T

Length (ft)

Width (ft)

Depth (in)

Number of identical pours

Mix Type

Bag Size

Add Rebar

Wire Mesh

Waste Factor10%

5%10% typical20%

Delivery Fee

Volume

1.36 yd³

Bags Needed

Weight

2.8 tons

Est. Cost

$341

Volume Breakdown

Raw Volume1.23 yd³

+ Waste0.12 yd³

Total Needed1.36 yd³

80 lb bag62 bags

Truck Loads (9 yd³)1

Cost Breakdown

Concrete$341

Total$341

What You'll Need

Quick Setting Cement 10lb Bag

$10-$124.6

View on Amazon

True Temper 6 Cu Ft Steel Tray Wheelbarrow

$89-$1204.5

View on Amazon

MARSHALLTOWN Finishing Trowel 4.75x14 Steel

$40-$454.7

View on Amazon

Stainless Steel Garden Hoe Rake Weeding Tool

$30-$354.5

View on Amazon

Weed Barrier Landscape Fabric Heavy Duty 6.5ftx300ft

$65-$754.5

View on Amazon

BOSCH GLM20 Blaze 65ft Laser Distance Measure

$30-$504.6

View on Amazon

Quick Setting Cement 10lb Bag

$10-$124.6

View on Amazon

True Temper 6 Cu Ft Steel Tray Wheelbarrow

$89-$1204.5

View on Amazon

MARSHALLTOWN Finishing Trowel 4.75x14 Steel

$40-$454.7

View on Amazon

Stainless Steel Garden Hoe Rake Weeding Tool

$30-$354.5

View on Amazon

Weed Barrier Landscape Fabric Heavy Duty 6.5ftx300ft

$65-$754.5

View on Amazon

BOSCH GLM20 Blaze 65ft Laser Distance Measure

$30-$504.6

View on Amazon

As an Amazon Associate, we earn from qualifying purchases.

How This Calculator Works

Volume calculations follow Portland Cement Association standards. Includes 10% waste factor recommendation per industry best practice.

Sources: Portland Cement Association, International Building Code (IBC)

Frequently Asked Questions

How do I calculate how much concrete I need?

Volume = Length × Width × Thickness. Convert to cubic yards: Volume (cu ft) ÷ 27 = cubic yards. Example: 10ft × 10ft × 4in slab = 100 sq ft × 0.33 ft = 33 cu ft ÷ 27 = 1.22 cubic yards.

Formula: L × W × Thickness (in feet) = cubic feet
Convert to yards: Cubic feet ÷ 27 = cubic yards
4 inch slab: Multiply sq ft × 0.33 ft ÷ 27
6 inch slab: Multiply sq ft × 0.50 ft ÷ 27
Always round UP and add 5-10% waste

Slab Thickness	Sq Ft per Cubic Yard	Example: 100 sq ft
4 inches	81 sq ft	1.23 cubic yards
5 inches	65 sq ft	1.54 cubic yards
6 inches	54 sq ft	1.85 cubic yards
8 inches	40 sq ft	2.47 cubic yards

How many bags of concrete do I need?

< 1 cubic yard: Bags are usually more practical
> 1 cubic yard: Ready-mix truck is more economical
80 lb bags: Best value per cubic foot
Quikrete vs Sakrete: Similar performance, compare prices

Bag Size	Yield (cu ft)	Bags per Cu Yard	Best For
40 lb	0.30 cu ft	90 bags	Small repairs
60 lb	0.45 cu ft	60 bags	Posts, small projects
80 lb	0.60 cu ft	45 bags	Most DIY projects

How thick should my concrete slab be?

Add wire mesh or rebar for crack prevention
Thicker edges for driveways (6" apron)
Check local building codes for requirements
Proper base preparation is as important as thickness

Application	Minimum Thickness	Recommended	Notes
Sidewalk	3.5"	4"	Light foot traffic
Patio	4"	4"	Furniture, foot traffic
Driveway (cars)	4"	4-5"	Regular vehicles
Driveway (trucks/RV)	5"	6"	Heavy vehicles
Garage floor	4"	4-6"	Depends on vehicles
Shed foundation	4"	4"	Light structures

Should I order extra concrete?

5% extra: Simple flat slabs with good forms
10% extra: Uneven ground, complex shapes
15% extra: Slopes, irregular edges
Running short mid-pour = disaster (cold joints)
Leftover concrete: Stepping stones, small repairs

Ready-mix vs bagged concrete: Which is better?

Bagged: Best for < 1 cubic yard (< 45 bags). Ready-mix: More economical for 1+ cubic yards, faster, more consistent. Break-even is typically around 1 cubic yard. Factor in your time mixing bags.

Ready-mix minimum: Usually 1 yard (some do 0.5 yard)
Ready-mix: Order exact PSI strength you need
Saturday delivery: Often extra charge
Have helpers ready - concrete waits for no one!

Factor	Bagged Concrete	Ready-Mix Truck
Best for	< 1 cubic yard	1+ cubic yards
Cost per yard	$100-150	$150-200 + delivery
Labor	You mix each bag	Truck pours
Quality	Variable	Consistent
Time	Hours of mixing	Poured in minutes

What PSI concrete do I need?

3000 PSI is standard for most residential
Freeze-thaw areas: Consider 4000 PSI + air entrainment
Bagged concrete: Usually 3000-4000 PSI
PSI develops over 28 days (reaches 70% in 7 days)

PSI Rating	Use Cases	Cost
2500 PSI	Footings, foundations	Lowest
3000 PSI	Driveways, sidewalks, patios	Standard
3500 PSI	Driveways with heavy vehicles	Moderate
4000 PSI	Commercial, garage floors	Higher
5000+ PSI	Industrial, freeze-thaw areas	Highest

Find a Contractor Near You

Get free quotes from licensed contractors in your area

Angi4.7/5

Verified reviews & background checks

Get Free Quotes

Showing results for your area

Example Calculations

1Standard Patio Slab (10×10 ft)

Inputs

Length10 ft

Width10 ft

Thickness4 inches

Result

Concrete Needed1.23 cubic yards

80 lb Bags56 bags

With 10% Waste1.35 cubic yards

A 100 sq ft patio at 4" thick requires about 1.23 yards. Order 1.5 yards from ready-mix or 56 bags.

2Two-Car Driveway

Inputs

Length20 ft

Width18 ft

Thickness5 inches

Result

Concrete Needed5.56 cubic yards

With 10% Waste6.1 cubic yards

RecommendationOrder ready-mix

At 5" thick for vehicles, a 360 sq ft driveway needs ~6 yards. Ready-mix is the only practical option.

3Fence Post Holes (10 posts)

Inputs

Posts10

Hole Diameter10 inches

Hole Depth24 inches

Result

Concrete per Post0.58 cu ft

Total for 10 Posts5.8 cu ft

80 lb Bags Needed10 bags

For fence posts, use 1 bag (80 lb) per post hole. Bagged concrete is perfect for this application.

Show all examples

Formulas Used

Concrete Volume (Rectangular)

Volume = Length × Width × Thickness

Basic formula for slabs, patios, and driveways.

Where:

Length= Length in feet

Width= Width in feet

Thickness= Thickness in feet (divide inches by 12)

Source: Portland Cement Association

Cubic Feet to Cubic Yards

Cubic Yards = Cubic Feet ÷ 27

Convert volume to ordering units (1 cubic yard = 27 cubic feet).

Cylinder Volume (Posts/Footings)

Volume = π × radius² × depth

For round holes like fence posts and tube footings.

Show all formulas

Complete Guide to Concrete Estimation and Ordering

Square Feet per Cubic Yard by Slab Thickness

Slab Thickness	Sq Ft per Cubic Yard	Common Application
4 inches	81 sq ft	Patios, sidewalks, shed pads
5 inches	65 sq ft	Residential driveways
6 inches	54 sq ft	Heavy-vehicle driveways, garage floors
8 inches	40 sq ft	Commercial slabs, equipment pads

Quick check: Divide your total square footage by the coverage number above. A 400 sq ft driveway at 5 inches = 400 ÷ 65 = 6.15 cubic yards before waste.

Bagged Concrete vs. Ready-Mix Truck Delivery

Factor	Bagged (80 lb)	Ready-Mix Truck
Best for	Under 1 cu yd	1+ cu yd
Cost per cu yd	$225–$270	$150–$200 + delivery
Bags per cu yd	45 bags	N/A
Mix time per yd	4–6 hours hand-mix	10 minutes
Consistency	Variable	Plant-batched, uniform

Tip: Most ready-mix plants charge $1–$2 per minute for wait time beyond 5–7 minutes per yard. Have your forms, rebar, and helpers ready before the truck arrives.

Slab Thickness Guide by Application

PSI ratings assume standard residential loads; verify with local building codes
Application	Thickness	PSI Rating	Reinforcement
Patio/sidewalk	4 in.	3,000	Wire mesh or fiber
Driveway (cars)	4–5 in.	3,000–3,500	Wire mesh
Driveway (trucks/RV)	5–6 in.	3,500–4,000	Rebar #3 @ 18 in.
Garage floor	4–6 in.	3,000–4,000	Wire mesh or rebar
Footings (residential)	8–12 in.	2,500–3,000	Rebar per code

Reinforcement, Subgrade Prep, and Pouring Tips

Wire mesh: $3–$5 per sheet, adequate for patios and light-duty slabs
Rebar #3 @ 18 in.: $0.50–$0.75 per linear foot, required for driveways over 5 in.
Fiber reinforcement: $8–$12 per bag additive, reduces surface cracking but not structural
Gravel base: 4 in. compacted, $25–$40 per cubic yard delivered
Vapor barrier: 6-mil poly, $0.10–$0.15 per sq ft, prevents moisture migration

Related Calculators

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Tile Calculator

Calculate tiles needed

Flooring Calculator

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Soil Calculator

Calculate how much soil you need for raised beds, gardens, and landscaping. Get cubic yards, bags needed, and cost estimates for your project. Compare options.

Post Hole Concrete Calculator

Calculate how many bags of concrete you need for fence and deck post holes. Enter post size, hole dimensions, and number of posts for accurate estimates.

Concrete Countertop Calculator

Calculate concrete mix, reinforcement, and finishing materials for DIY countertops. Compare total project costs vs granite, quartz, and professional install.

Related Resources

How Much Concrete Do I Need? Concrete Calculator for Slabs & Footings

Read our guide

How Much Does Concrete Work Cost in 2026? (Driveways, Patios & Slabs)

Read our guide

Average Concrete Cost by State in 2026 (All 50 States Compared)

Read our guide

Flooring Calculator Guide

Plan flooring materials for your project

Paint Calculator Guide

Calculate paint coverage for any room

Construction Tools

Plan your project

View All

Last Updated: Mar 26, 2026

Concrete Calculator

Project Type & Dimensions

Concrete Mix

Reinforcement

Waste & Delivery

Cost Estimation

Volume Breakdown

Cost Breakdown

What You'll Need

Quick Setting Cement 10lb Bag

True Temper 6 Cu Ft Steel Tray Wheelbarrow

MARSHALLTOWN Finishing Trowel 4.75x14 Steel

Stainless Steel Garden Hoe Rake Weeding Tool

Weed Barrier Landscape Fabric Heavy Duty 6.5ftx300ft

BOSCH GLM20 Blaze 65ft Laser Distance Measure

Quick Setting Cement 10lb Bag

True Temper 6 Cu Ft Steel Tray Wheelbarrow

MARSHALLTOWN Finishing Trowel 4.75x14 Steel

Stainless Steel Garden Hoe Rake Weeding Tool

Weed Barrier Landscape Fabric Heavy Duty 6.5ftx300ft

BOSCH GLM20 Blaze 65ft Laser Distance Measure

How This Calculator Works

Frequently Asked Questions

How do I calculate how much concrete I need?

How many bags of concrete do I need?

How thick should my concrete slab be?

Should I order extra concrete?

Ready-mix vs bagged concrete: Which is better?

What PSI concrete do I need?

Find a Contractor Near You

Example Calculations

1Standard Patio Slab (10×10 ft)

2Two-Car Driveway

3Fence Post Holes (10 posts)

Formulas Used

Concrete Volume (Rectangular)

Cubic Feet to Cubic Yards

Cylinder Volume (Posts/Footings)

Complete Guide to Concrete Estimation and Ordering

Square Feet per Cubic Yard by Slab Thickness

Bagged Concrete vs. Ready-Mix Truck Delivery

Slab Thickness Guide by Application

Reinforcement, Subgrade Prep, and Pouring Tips

Related Calculators

Area Calculator

Tile Calculator

Flooring Calculator

Soil Calculator

Post Hole Concrete Calculator

Concrete Countertop Calculator

Related Resources

How Much Concrete Do I Need? Concrete Calculator for Slabs & Footings

How Much Does Concrete Work Cost in 2026? (Driveways, Patios & Slabs)

Average Concrete Cost by State in 2026 (All 50 States Compared)

Flooring Calculator Guide

Paint Calculator Guide

Construction Tools

Concrete Calculator

Project Type & Dimensions

Concrete Mix

Reinforcement

Waste & Delivery

Cost Estimation

Volume Breakdown

Cost Breakdown

What You'll Need

Quick Setting Cement 10lb Bag

True Temper 6 Cu Ft Steel Tray Wheelbarrow

MARSHALLTOWN Finishing Trowel 4.75x14 Steel

Stainless Steel Garden Hoe Rake Weeding Tool

Weed Barrier Landscape Fabric Heavy Duty 6.5ftx300ft

BOSCH GLM20 Blaze 65ft Laser Distance Measure

Quick Setting Cement 10lb Bag

True Temper 6 Cu Ft Steel Tray Wheelbarrow

MARSHALLTOWN Finishing Trowel 4.75x14 Steel

Stainless Steel Garden Hoe Rake Weeding Tool

Weed Barrier Landscape Fabric Heavy Duty 6.5ftx300ft

BOSCH GLM20 Blaze 65ft Laser Distance Measure

How This Calculator Works

Frequently Asked Questions