--- title: "How many bags of concrete in a yard? 80, 60 and 40 lb" description: "About 45 bags of 80 lb concrete make a cubic yard, 60 of 60 lb, 90 of 40 lb. A slab chart in yards and bags with 10% waste, as a free printable PDF." canonical: https://klmlabs.app/construction-calculator/concrete-bags-per-yard/ updated: 2026-11-07 --- # How many bags of concrete in a yard? It takes about 45 bags of 80 lb concrete to make a cubic yard, 60 bags of 60 lb or 90 bags of 40 lb. With 10% extra for waste, buy 50, 66 or 99. Download the printable chart (PDF, US Letter, 1 page, 30 KB): https://klmlabs.app/construction-calculator/charts/concrete-bags-per-yard.pdf. Every number is worked out by Construction Calculator 1.1.1's own formulas. ## Bags of premixed concrete in one cubic yard | Bag | Yield per bag | Bags per cubic yard | With 10% waste | |---|---:|---:|---:| | 80 lb | 0.6 cu ft | 45 | 50 (49.5) | | 60 lb | 0.45 cu ft | 60 | 66 | | 40 lb | 0.3 cu ft | 90 | 99 | A cubic yard is 27 cubic feet. Bag counts are rounded up; the exact figure is in brackets. ## Concrete for a slab (with 10% waste) | Slab | 4" thick: cu yd | 4" thick: 80 lb bags | 6" thick: cu yd | 6" thick: 80 lb bags | |---|---:|---:|---:|---:| | 8' × 8' | 0.87 | 40 | 1.3 | 59 | | 10' × 10' | 1.36 | 62 | 2.04 | 92 | | 10' × 12' | 1.63 | 74 | 2.44 | 110 | | 12' × 12' | 1.96 | 88 | 2.93 | 132 | | 12' × 16' | 2.61 | 118 | 3.91 | 176 | | 10' × 20' | 2.72 | 123 | 4.07 | 184 | | 12' × 20' | 3.26 | 147 | 4.89 | 220 | | 16' × 16' | 3.48 | 157 | 5.21 | 235 | | 20' × 20' | 5.43 | 245 | 8.15 | 367 | | 24' × 24' | 7.82 | 352 | 11.73 | 528 | Cubic yards to 2 decimal places. Bag counts are rounded up. ## How many yards of concrete is a 12x12 slab? A 12' × 12' slab 4" thick is 12 × 12 × 4/12 = 48 cubic feet, which is 1.78 cubic yards. With 10% for waste it is 1.96 cubic yards, or 88 bags of 80 lb concrete. At 6" thick it takes 2.93 cubic yards with waste, or 132 bags. ## How many bags of concrete for a 10x10 slab? At 4" thick, a 10' × 10' slab is 33.33 cubic feet. With 10% waste that is 36.67 cubic feet, 1.36 cubic yards, or 62 bags of 80 lb concrete (61.11 exactly, rounded up). With no waste it is 56 bags. ## How much concrete does one bag make? For QUIKRETE Concrete Mix, an 80 lb bag makes about 0.60 cubic feet, a 60 lb bag 0.45 and a 40 lb bag 0.30. Other mixes differ: check the bag. ## Work out your own with Construction Calculator - Cubic yards and 80, 60 or 40 lb bags from length, width and depth - Starts at 10% waste; change it for your job - Feet, inches and fractions in, exact volume out Download Construction Calculator on the App Store: https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977 Free to download, with in-app purchases. Every feature, the calculator included, needs the free trial or a purchase: Yearly US$9.99 a year with a 7-day free trial for eligible new subscribers, or Lifetime US$19.99 paid once (US prices). iPhone and iPad, iOS 17.0 or later. All the facts: https://klmlabs.app/construction-calculator/ ## The facts this page states, with sources As KLM Labs' fact record words them; the page may put them in its own words. Construction Calculator's facts page: https://klmlabs.app/construction-calculator/ - 11 tools, from stairs, roof pitch and rafters to concrete, board feet and miters. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - Multiply lengths for square feet, cubic feet and cubic yards. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - Hold a tool's length, area or volume to send it to the calculator. (Source: [Apple's app lookup](https://itunes.apple.com/lookup?id=6816445977&country=us).) - QUIKRETE Concrete Mix No. 1101 yields: 40 lb about 0.30 cu ft, 60 lb about 0.45 cu ft, 80 lb about 0.60 cu ft. (Source: https://www.quikrete.com/pdfs/data_sheet-concrete%20mix%201101.pdf (data sheet revised October 2022; read 2026-11-06).) - 27 cubic feet = 1 cubic yard; 1,728 cubic inches = 1 cubic foot. (Source: https://www.nist.gov/document/2026-nist-handbook-44-appendix-c (NIST Handbook 44, 2026, Appendix C; read 2026-11-06).) ## More construction charts - [How to calculate square footage from inches and fractions](https://klmlabs.app/construction-calculator/square-feet-from-feet-and-inches/): Multiply length × width in inches and divide by 144 for square feet. Worked examples with feet, inches and fractions, done exactly, and a printable chart. - [How to calculate board feet](https://klmlabs.app/construction-calculator/board-feet/): A board foot is 144 cubic inches of lumber, 12" × 12" × 1". How to calculate board feet from nominal sizes, with a printable chart for 1x4 to 6x6. - [Stair rise and run code: 7-3/4" risers, 10" treads](https://klmlabs.app/construction-calculator/stair-rise-and-run/): The 2021 IRC limits for stair risers (7-3/4" max) and treads (10" min), the 7-11 rule, and worked stair layouts for rises from 2' to 10'. Free PDF. - [Fraction to decimal chart: inches, millimeters and feet](https://klmlabs.app/construction-calculator/fraction-decimal-inch-chart/): A fraction to decimal chart for every 64th of an inch, with millimeters and decimal feet, plus inches to decimal feet. Free printable PDF, US Letter. - [Roof pitch chart: degrees, slope and rafter length](https://klmlabs.app/construction-calculator/roof-pitch-chart/): A roof pitch chart from 1/12 to 24/12: the angle in degrees, slope percent, plumb and seat cuts, and rafter length per foot of run. Free printable PDF. - [Crown molding angles chart: miter and bevel settings](https://klmlabs.app/construction-calculator/crown-molding-angles/): Miter and bevel settings for 52/38 and 45/45 crown molding cut flat on a compound miter saw, for wall corners from 60° to 150°. Free printable chart. All 7 construction charts: https://klmlabs.app/construction-calculator/guides/ ## Sources 1. [QUIKRETE: Concrete Mix No. 1101 data sheet (yield per bag, revised October 2022)](https://www.quikrete.com/pdfs/data_sheet-concrete%20mix%201101.pdf) 2. [QUIKRETE: Concrete Mix product page](https://www.quikrete.com/productlines/concretemix.asp) 3. [NIST Handbook 44 (2026), Appendix C: 27 cubic feet = 1 cubic yard](https://www.nist.gov/document/2026-nist-handbook-44-appendix-c) 4. [Fraction Feet Inch Calculator (Construction Calculator) on the App Store](https://apps.apple.com/us/app/fraction-feet-inch-calculator/id6816445977) Last updated November 7, 2026.