Concrete guides
Concrete Volume & Bag Guides
Concrete is ordered by the cubic yard or bought by the bag, and the two do not convert cleanly without knowing the bag yield. These guides work through slabs, footings and posts — volume first, then bags — so you know what to order before the truck or the store run.
10x10 Concrete Slab Calculator
A 10×10 ft slab needs about 1.23 cubic yards (order 1.36) of concrete — worked example with bags and the 10% waste allowance.
12x12 Concrete Slab Calculator
A 12×12 ft slab needs about 1.78 cubic yards (order 1.96) of concrete — worked example with bags and the 10% waste allowance.
Brick Calculator
An 8 by 10 ft wall needs about 588–616 bricks — worked example with waste, mortar bags and cost ranges.
Brick Calculator for a Wall
An 8 by 10 ft wall needs about 588–616 bricks — worked example with waste, mortar bags and cost ranges.
Concrete Bags Calculator
A 15×10 ft slab needs about 84–92 80 lb bags of concrete — worked example with cubic yards and the 10% waste allowance.
Concrete Calculator
A 10×12 ft slab needs about 1.48 cubic yards (order 1.63) of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator Cubic Yards
A 20×15 ft slab needs about 3.70 cubic yards (order 4.07) of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator for a 10x10 Slab
A 10 by 10 ft slab at 4 in thick needs about 1.2–1.4 cubic yards (56–62 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator for a 10x20 Slab
A 10 by 20 ft slab at 4 in thick needs about 2.5–2.7 cubic yards (112–123 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator for a 12x12 Slab
A 12 by 12 ft slab at 4 in thick needs about 1.8–2 cubic yards (80–88 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator for a 15x15 Slab
A 15 by 15 ft slab at 4 in thick needs about 2.8–3.1 cubic yards (125–138 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator for a 16x16 Slab
A 16 by 16 ft slab at 4 in thick needs about 3.2–3.5 cubic yards (143–157 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator for a 20x20 Slab
A 20 by 20 ft slab at 4 in thick needs about 4.9–5.4 cubic yards (223–245 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator for a 24x24 Slab
A 24 by 24 ft slab at 4 in thick needs about 7.1–7.8 cubic yards (320–352 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator for a 30x40 Slab
A 30 by 40 ft slab at 4 in thick needs about 14.8–16.3 cubic yards (667–734 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator For A 4 Inch Slab
A 12×18 ft slab needs about 2.67 cubic yards (order 2.93) of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator for a 40x60 Slab
A 40 by 60 ft slab at 4 in thick needs about 29.6–32.6 cubic yards (1334–1467 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator For A 6 Inch Slab
A 12×18 ft slab needs about 4.00 cubic yards (order 4.40) of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator for a 8x10 Slab
A 8 by 10 ft slab at 4 in thick needs about 1–1.1 cubic yards (45–49 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Calculator For A Countertop
An 8 ft concrete countertop needs about 0.07 cubic yards — worked example with bags and the 10% waste allowance.
Concrete Calculator For A Driveway
A 10×30 ft slab needs about 3.70 cubic yards (order 4.07) of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator For A Fence Post
Six fence posts need about 3–6 80 lb bags of concrete — worked example with the per-post range.
Concrete Calculator For A Footing
A 20 ft strip footing needs about 1.48 cubic yards of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator For A Patio
A 12×12 ft slab needs about 1.78 cubic yards (order 1.96) of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator For A Sidewalk
A 30×4 ft slab needs about 1.48 cubic yards (order 1.63) of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator For A Slab
A 10×14 ft slab needs about 1.73 cubic yards (order 1.90) of concrete — worked example with bags and the 10% waste allowance.
Concrete Calculator For A Steps
Three 4 ft wide concrete steps need about 0.48 cubic yards — worked example with bags and the 10% waste allowance.
Concrete Cost Calculator
The example needs about 2.4–2.6 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
Concrete Cost per Yard
The example needs about 2.4–2.6 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
Concrete Countertop Calculator
An 8 ft concrete countertop, 2 ft deep and 1.5 in thick, needs about 0.07–0.08 cubic yards — roughly 4–4 80 lb bags — worked step by step with waste and cost ranges.
Concrete Footing Calculator
A 20 ft footing needs about 0.5–0.5 cubic yards (23–25 80 lb bags) — worked example with bag counts and cost ranges.
Concrete Sidewalk Calculator
A 24 ft sidewalk, 4 ft wide and 4 in thick, needs about 1.2–1.3 cubic yards — roughly 54–59 80 lb bags — worked step by step with waste and cost ranges.
Concrete Slab Calculator
A 12×16 ft slab needs about 2.37 cubic yards (order 2.61) of concrete — worked example with bags and the 10% waste allowance.
Concrete Steps Calculator
Five concrete steps, 4 ft wide with a 7 in rise and 11 in tread, need about 1.19–1.31 cubic yards — roughly 54–59 80 lb bags — worked step by step with waste and cost ranges.
Cubic Yard Concrete Calculator
A 24×12 ft slab needs about 3.56 cubic yards (order 3.91) of concrete — worked example with bags and the 10% waste allowance.
Cubic Yards Of Concrete For A Countertop
A 12 ft concrete countertop, 25 in deep and 2 in thick, needs about 0.15–0.17 cubic yards — roughly 7–8 80 lb bags — worked step by step with waste and cost ranges.
Cubic Yards Of Concrete For A Driveway
A 20 ft by 12 ft driveway section, 4 in thick needs about 3.0–3.3 cubic yards — roughly 134–147 80 lb bags — worked step by step with waste and cost ranges.
Cubic Yards Of Concrete For A Fence Post
Four fence post holes, each 12 in across and 30 in deep, need about 0.29–0.32 cubic yards — roughly 14–15 80 lb bags — worked step by step with waste and cost ranges.
Cubic Yards Of Concrete For A Footing
A 40 ft footing trench, 16 in wide and 12 in deep, needs about 2.0–2.2 cubic yards — roughly 89–98 80 lb bags — worked step by step with waste and cost ranges.
Cubic Yards Of Concrete For A Patio
A 14 ft by 10 ft patio slab, 4 in thick needs about 1.7–1.9 cubic yards — roughly 78–86 80 lb bags — worked step by step with waste and cost ranges.
Cubic Yards Of Concrete For A Slab
A 16 ft by 12 ft slab, 4 in thick needs about 2.4–2.6 cubic yards — roughly 107–118 80 lb bags — worked step by step with waste and cost ranges.
How Many 60lb Bags Of Concrete Per Cubic Yard
One cubic yard of concrete takes about 60 60 lb bags — worked example with the 10% waste allowance.
How Many 80lb Bags Of Concrete Per Cubic Yard
One cubic yard of concrete takes about 45 80 lb bags — worked example with the 10% waste allowance.
How Many Bags Of Concrete Do I Need
A 8×10 ft slab needs about 45–49 80 lb bags of concrete — worked example with cubic yards and the 10% waste allowance.
How Many Bags Of Concrete For A 10x10 Slab
A 10×10 ft slab needs about 56–62 80 lb bags of concrete — worked example with cubic yards and the 10% waste allowance.
How Many Bags of Concrete for a 10x20 Slab
A 10 by 20 ft slab at 4 in thick needs about 2.5–2.7 cubic yards (112–123 80 lb bags) — worked example with bag counts and cost ranges.
How Many Bags Of Concrete For A 12x12 Slab
A 12×12 ft slab needs about 80–88 80 lb bags of concrete — worked example with cubic yards and the 10% waste allowance.
How Many Bags of Concrete for a 15x15 Slab
A 15 by 15 ft slab at 4 in thick needs about 2.8–3.1 cubic yards (125–138 80 lb bags) — worked example with bag counts and cost ranges.
How Many Bags of Concrete for a 16x16 Slab
A 16 by 16 ft slab at 4 in thick needs about 3.2–3.5 cubic yards (143–157 80 lb bags) — worked example with bag counts and cost ranges.
How Many Bags of Concrete for a 20x20 Slab
A 20 by 20 ft slab at 4 in thick needs about 4.9–5.4 cubic yards (223–245 80 lb bags) — worked example with bag counts and cost ranges.
How Many Bags of Concrete for a 24x24 Slab
A 24 by 24 ft slab at 4 in thick needs about 7.1–7.8 cubic yards (320–352 80 lb bags) — worked example with bag counts and cost ranges.
How Many Bags of Concrete for a 30x40 Slab
A 30 by 40 ft slab at 4 in thick needs about 14.8–16.3 cubic yards (667–734 80 lb bags) — worked example with bag counts and cost ranges.
How Many Bags of Concrete for a 40x60 Slab
A 40 by 60 ft slab at 4 in thick needs about 29.6–32.6 cubic yards (1334–1467 80 lb bags) — worked example with bag counts and cost ranges.
How Many Bags of Concrete for a 8x10 Slab
A 8 by 10 ft slab at 4 in thick needs about 1–1.1 cubic yards (45–49 80 lb bags) — worked example with bag counts and cost ranges.
How Many Bags of Concrete for a Countertop
An 8 ft long countertop run at 4 in thick needs about 9–10 80 lb bags — worked example with 60 lb bag counts and cost ranges.
How Many Bags of Concrete for a Driveway
A single-car driveway strip at 4 in thick needs about 134–147 80 lb bags — worked example with 60 lb bag counts and cost ranges.
How Many Bags Of Concrete For A Fence Post
Six fence posts need about 3–6 80 lb bags of concrete — worked example with the per-post range.
How Many Bags of Concrete for a Footing
A 20 ft run of 12 in wide footing at 4 in thick needs about 12–13 80 lb bags — worked example with 60 lb bag counts and cost ranges.
How Many Bags Of Concrete For A Patio
A 14×12 ft slab needs about 94–103 80 lb bags of concrete — worked example with cubic yards and the 10% waste allowance.
How Many Bags of Concrete for a Sidewalk
A 4 ft wide sidewalk run at 4 in thick needs about 45–49 80 lb bags — worked example with 60 lb bag counts and cost ranges.
How Many Bags Of Concrete For A Slab
A 12×12 ft slab needs about 80–88 80 lb bags of concrete — worked example with cubic yards and the 10% waste allowance.
How Many Bags of Concrete for a Steps
The landing pad at the base of the steps at 4 in thick needs about 12–13 80 lb bags — worked example with 60 lb bag counts and cost ranges.
How Many Bricks do I Need
An 8 by 10 ft wall needs about 588–616 bricks — worked example with waste, mortar bags and cost ranges.
How Many Pavers do I Need
A 12 by 12 ft patio needs about 152–159 pavers — worked example with waste, base and jointing sand ranges.
How Many Retaining Wall Blocks do I Need
A 20 by 3 ft retaining wall needs about 60–120 blocks — worked example with caps, base and drainage ranges.
How Much Concrete Do I Need
A 10×10 ft slab needs about 1.23 cubic yards (order 1.36) of concrete — worked example with bags and the 10% waste allowance.
How Much Concrete For A 10x10 Slab
A 10×10 ft slab needs about 1.23 cubic yards (order 1.36) of concrete — worked example with bags and the 10% waste allowance.
How Much Concrete For A 10x10 Slab 4 Inches Thick
A 10 ft by 10 ft slab, 4 in thick needs about 1.2–1.4 cubic yards — roughly 56–62 80 lb bags — worked step by step with waste and cost ranges.
How Much Concrete For A 10x10 Slab 6 Inches Thick
A 10 ft by 10 ft slab, 6 in thick needs about 1.9–2.0 cubic yards — roughly 84–92 80 lb bags — worked step by step with waste and cost ranges.
How Much Concrete For A 12x12 Slab 4 Inches Thick
A 12 ft by 12 ft slab, 4 in thick needs about 1.8–2.0 cubic yards — roughly 80–88 80 lb bags — worked step by step with waste and cost ranges.
How Much Concrete For A 12x12 Slab 6 Inches Thick
A 12 ft by 12 ft slab, 6 in thick needs about 2.7–2.9 cubic yards — roughly 120–132 80 lb bags — worked step by step with waste and cost ranges.
How Much Concrete For A 20x20 Slab
A 20×20 ft slab needs about 4.94 cubic yards (order 5.43) of concrete — worked example with bags and the 10% waste allowance.
How Much Concrete For A 20x20 Slab 4 Inches Thick
A 20 ft by 20 ft slab, 4 in thick needs about 4.9–5.4 cubic yards — roughly 223–245 80 lb bags — worked step by step with waste and cost ranges.
How Much Concrete For A Countertop
A 10 ft concrete countertop, 25 in deep and 2 in thick, needs about 0.13–0.14 cubic yards — roughly 6–7 80 lb bags — worked step by step with waste and cost ranges.
How Much Concrete for a Countertop 4 Inches Thick
An 8 ft long countertop run at 4 in thick needs about 0.2–0.2 cubic yards (9–10 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Countertop 6 Inches Thick
An 8 ft long countertop run at 6 in thick needs about 0.3–0.3 cubic yards (14–15 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Countertop 8 Inches Thick
An 8 ft long countertop run at 8 in thick needs about 0.4–0.4 cubic yards (18–20 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete For A Driveway
A 12×40 ft slab needs about 5.93 cubic yards (order 6.52) of concrete — worked example with bags and the 10% waste allowance.
How Much Concrete for a Driveway 4 Inches Thick
A single-car driveway strip at 4 in thick needs about 3–3.3 cubic yards (134–147 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Driveway 6 Inches Thick
A single-car driveway strip at 6 in thick needs about 4.4–4.9 cubic yards (200–220 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Driveway 8 Inches Thick
A single-car driveway strip at 8 in thick needs about 5.9–6.5 cubic yards (267–294 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Fence Post 4 Inches Thick
One 12 by 12 in post footing, repeated for four posts at 4 in thick needs about 0–0.1 cubic yards (3–3 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Fence Post 6 Inches Thick
One 12 by 12 in post footing, repeated for four posts at 6 in thick needs about 0.1–0.1 cubic yards (4–4 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Fence Post 8 Inches Thick
One 12 by 12 in post footing, repeated for four posts at 8 in thick needs about 0.1–0.1 cubic yards (5–5 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Footing 4 Inches Thick
A 20 ft run of 12 in wide footing at 4 in thick needs about 0.2–0.3 cubic yards (12–13 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Footing 6 Inches Thick
A 20 ft run of 12 in wide footing at 6 in thick needs about 0.4–0.4 cubic yards (17–19 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Footing 8 Inches Thick
A 20 ft run of 12 in wide footing at 8 in thick needs about 0.5–0.5 cubic yards (23–25 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete For A Patio
A 16×12 ft slab needs about 2.37 cubic yards (order 2.61) of concrete — worked example with bags and the 10% waste allowance.
How Much Concrete for a Patio 4 Inches Thick
A backyard patio at 4 in thick needs about 2.4–2.6 cubic yards (107–118 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Patio 6 Inches Thick
A backyard patio at 6 in thick needs about 3.6–3.9 cubic yards (160–176 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Patio 8 Inches Thick
A backyard patio at 8 in thick needs about 4.7–5.2 cubic yards (214–235 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete For A Sidewalk
A 30 ft sidewalk, 3.5 ft wide and 4 in thick, needs about 1.3–1.4 cubic yards — roughly 59–65 80 lb bags — worked step by step with waste and cost ranges.
How Much Concrete for a Sidewalk 4 Inches Thick
A 4 ft wide sidewalk run at 4 in thick needs about 1–1.1 cubic yards (45–49 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Sidewalk 6 Inches Thick
A 4 ft wide sidewalk run at 6 in thick needs about 1.5–1.6 cubic yards (67–74 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Sidewalk 8 Inches Thick
A 4 ft wide sidewalk run at 8 in thick needs about 2–2.2 cubic yards (89–98 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Slab 4 Inches Thick
A shed slab at 4 in thick needs about 2.4–2.6 cubic yards (107–118 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Slab 6 Inches Thick
A shed slab at 6 in thick needs about 3.6–3.9 cubic yards (160–176 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Slab 8 Inches Thick
A shed slab at 8 in thick needs about 4.7–5.2 cubic yards (214–235 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete For A Sonotube
A 10 in diameter sonotube, 3 ft deep, needs about 1.64–1.80 cubic feet — roughly 4–4 60 lb bags — worked step by step with waste and cost ranges.
How Much Concrete for a Steps 4 Inches Thick
The landing pad at the base of the steps at 4 in thick needs about 0.2–0.3 cubic yards (12–13 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Steps 6 Inches Thick
The landing pad at the base of the steps at 6 in thick needs about 0.4–0.4 cubic yards (17–19 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete for a Steps 8 Inches Thick
The landing pad at the base of the steps at 8 in thick needs about 0.5–0.5 cubic yards (23–25 80 lb bags) — worked example with bag counts and cost ranges.
How Much Concrete For Footings
A 24 ft footing trench, 16 in wide and 10 in deep, needs about 1.0–1.1 cubic yards — roughly 45–49 80 lb bags — worked step by step with waste and cost ranges.
How Much Concrete For Steps
Four concrete steps, 3.5 ft wide with a 7 in rise and 12 in tread, need about 0.76–0.83 cubic yards — roughly 35–38 80 lb bags — worked step by step with waste and cost ranges.
How Much Does a Concrete Countertop Cost
The example needs about 0.2–0.2 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
How Much Does a Concrete Driveway Cost
The example needs about 3–3.3 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
How Much Does a Concrete Fence Post Cost
The example needs about 0–0 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
How Much Does a Concrete Footing Cost
The example needs about 0.2–0.3 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
How Much Does a Concrete Patio Cost
The example needs about 2.4–2.6 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
How Much Does a Concrete Slab Cost
The example needs about 2.4–2.6 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
How Much Does a Concrete Steps Cost
The example needs about 0.2–0.3 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
How Much Does Concrete Cost per Cubic Yard
The example needs about 2.4–2.6 cubic yards — worked example with bag counts, delivery and short-load fee ranges.
How Much Mortar do I Need
An 8 by 10 ft brick wall needs about 12–19 bags of mortar — worked example with brick count and joint ranges.
How Much Mortar for a Brick Wall
An 8 by 10 ft brick wall needs about 12–19 bags of mortar — worked example with brick count and joint ranges.
Mortar Calculator
An 8 by 10 ft brick wall needs about 12–19 bags of mortar — worked example with brick count and joint ranges.
Paver Calculator
A 12 by 12 ft patio needs about 152–159 pavers — worked example with waste, base and jointing sand ranges.
Paver Calculator for a Patio
A 12 by 12 ft patio needs about 152–159 pavers — worked example with waste, base and jointing sand ranges.
Retaining Wall Calculator
A 20 by 3 ft retaining wall needs about 60–120 blocks — worked example with caps, base and drainage ranges.
Retaining Wall Calculator Blocks
A 20 by 3 ft retaining wall needs about 60–120 blocks — worked example with caps, base and drainage ranges.
Sonotube Concrete Calculator
A 12 in diameter sonotube, 4 ft deep, needs about 3.14–3.46 cubic feet — roughly 7–8 60 lb bags — worked step by step with waste and cost ranges.