Concrete, Gravel, Mulch & Topsoil Calculator
Bags by brand and size, yards, tons, weight to haul, and bags vs a truck at your prices.
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Pouring a slab, pad or patioBags by brand and size, or a truck, and your costSetting fence or mailbox postsBags per hole and in totalDeck footings or sonotubesConcrete per tube, pier or padGravel for a driveway, path or baseCubic yards, tons and bagsMulch for beds or a playgroundBags or bulk yardsTopsoil for a lawn or raised bedsYards, tons and bagsSomething else: the full calculatorAny shape: steps, circles, tree rings
I already know the amount: convert yards, bags and tonsQuestion
Your project
One cubic yard of concrete takes 45 bags of 80 lb Quikrete Concrete Mix, or 30 bags of 80 lb Sakrete Maximizer, from each maker's published yield.
Popular answers
80 lb bags in a yard45 bags of Quikrete Concrete Mix10 x 10 slab, 4 in56 bags of 80 lb, 1.23 cu yd12 in sonotube0.79 cu ft per footYard of topsoil weight0.80–1.28 tons (published range)Mulch bags in a yard14 bags of 2 cu ftConcrete for a 4x4 post2.4 bags of 50 lb fast-setting per hole
Calculators
Pouring a slab, pad or patioBags by brand and size, or a truck, and your costSetting fence or mailbox postsBags per hole and in totalDeck footings or sonotubesConcrete per tube, pier or padGravel for a driveway, path or baseCubic yards, tons and bagsMulch for beds or a playgroundBags or bulk yardsTopsoil for a lawn or raised bedsYards, tons and bagsYards, bags and tons converterEvery tracked bag size
FAQ
How many 80 lb bags of concrete make a yard?
A cubic yard is 27 cu ft. At Quikrete's published 0.60 cu ft per 80 lb bag that is 45 bags; Sakrete Maximizer (0.92 cu ft, lightweight) needs 30. All 80 lb mixes.
Do you show prices?
No. Prices differ by store, region and week, so the calculator compares bags with a ready-mix truck (or bulk) only with the prices you type in.
Can this tell me how thick my slab or how deep my footings must be?
No. We calculate volumes and bag counts only. Sizes for structural work come from your plans, an engineer or your local building department.
Sources
- Quikrete: QUIKRETE Concrete Mix (No. 1101) data sheet · fetched and reviewed 2026-11-10
- Sakrete: Sakrete Maximizer Concrete Mix technical data sheet · fetched and reviewed 2026-11-10
- NRMCA: CIP 31: Ordering Ready Mixed Concrete · fetched and reviewed 2026-11-10
Volumes only. ConcreteMath calculates volumes, bag counts, weights and your own cost figures. It gives no structural or engineering advice and never sizes footings, piers, slabs or rebar: those come from your plans, an engineer or your local building department. Bag counts are estimates from each maker's published yield; actual use varies with hole shape, uneven ground, waste and mixing. Bulk weights are published ranges; your supplier's figure wins.