10 cubic feet to gallons

Ten cubic feet is 74.8052 US gallons

17,280 cubic inches, 231 to the gallon

Ten cubic feet is 74.8051948051948 US gallons. A cubic foot is 1,728 cubic inches, so ten is 17,280, and the US gallon is 231 cubic inches: 17,280 / 231 = 74.8051948051948.

The one step version multiplies by 7.48051948051948 and lands on the same figure. NIST Handbook 44, Appendix C, 2024 edition prints the US gallon at exactly 231 cubic inches, with 3.785 liters on the same line, so nothing is rounded anywhere in the chain until the last digit.

Ten is a round number on paper and an awkward one in a bucket. It is 0.3704 cubic yard, 1.36 times a 55 gallon drum, three quarters of a 100 gallon stock tank and 14.96 five gallon buckets. The sections below work through each of those, with the slab, tank and bed sizes that land on this volume.

A contractor wheelbarrow carries about 6 cubic feet heaped, so ten cubic feet is 1.67 barrows. That is the figure that turns a delivery ticket into a morning of work, and it is also the reason a yard of soil is six barrows and not two.

Every row moves by the same 7.48051948051948 per cubic foot, and every cubic yard figure is the cubic feet divided by 27. A supplier who quotes yards and a form that asks for gallons are describing the same hole in the ground.

Three gallons share the name, and only one is on the pump

62.2884 imperial, 64.2851 dry

The imperial gallon is 4.54609 liters against 3.785411784 for the US gallon, so ten cubic feet is 62.2884 imperial gallons. The dry gallon is a different animal again, 268.8025 cubic inches, and the same 17,280 cubic inches gives 64.2851 dry gallons.

NIST Special Publication 811, Appendix B.8 gives the US gallon as 3.785 412 E-03 cubic meters and the imperial gallon as 4.546 09 E-03, and the ratio between those two numbers is the 1.20095 that turns one into the other. The dry gallon is not in that table at all, because NIST keeps it with the agricultural measures.

The ratios are easier to carry around than the full numbers. The imperial gallon is 1.20095 US gallons and the dry gallon is 1.16365. A fuel figure from a British chandlery or a Canadian dock therefore reads about 20 percent high if it is treated as US gallons, and a 60 imperial gallon tank is 72.05 US gallons.

Rounding is the third trap. A can sold as 10 gallons is rarely 10.000, and a barrel marked 55 may hold 57. Ten cubic feet is 17,280 cubic inches exactly, with no rounding anywhere in the chain, so hold that figure and re-derive the gallons when a number has to be exact.

Grain, seed and fertilizer are the trades where the dry gallon still shows up. A bushel is 8 dry gallons, or 2,150.42 cubic inches, which is 1.2445 cubic feet, so ten cubic feet is a little over eight bushels.

Divide ten cubic feet by any row in that table and the count of gallons comes back. 1,728 / 231 gives 7.4805 US gallons per cubic foot, 1,728 / 277.4194 gives 6.2288 imperial, and 1,728 / 268.8025 gives 6.4285 dry. Multiply each of those by ten and the three answers at the top of this section reappear, which is the cheapest way to catch a swapped factor.

A 4 by 10 foot slab at three inches is exactly 10 cubic feet

0.3704 cubic yard, 17 bags

A pad 4 feet wide, 10 feet long and 3 inches thick is 40 square feet at a quarter of a foot: 40 x 0.25 = 10 cubic feet, and 10 / 27 = 0.3704 cubic yard. That is a landing outside a back door, a pad under a shed, or the bottom step of a stoop.

Bags will cover it. An 80 pound bag yields about 0.6 cubic feet, so 10 / 0.6 = 16.667, which means 17 bags and 1,360 pounds of mix. At $7.25 a bag that is $123.25. Ready mix at $165 a yard prices the concrete at $61.11, but the short load charge on part of a yard usually lands near $260, and a chute cannot place it any slower than you can screed it.

A tube footing is the other common shape. A 12 inch sonotube 48 inches deep holds 3.1416 x 36 x 48 = 5,429 cubic inches, or 3.142 cubic feet, so ten cubic feet fills 3.18 tubes. Three take 9.4 cubic feet and the rest tops off a fourth.

Under the slab goes the base. A 4 inch layer of compacted gravel under 40 square feet is just over 13 cubic feet, which is half a cubic yard, and a plate compactor will settle it to about 3.5 inches in two passes. Wire mesh or 3/8 inch rebar at 16 inches on center sits in the middle of the pour, not on the dirt, and a 10 cubic foot slab takes about 30 feet of rebar in each direction.

Curing decides whether the slab lasts. Concrete gains most of its strength in the first week, and a pad left in the sun without water will craze and dust. Cover it for three days, keep it damp, and saw a control joint across the middle within 24 hours so the crack happens where you want it. A 4 by 10 pad gets one joint at 5 feet, cut a quarter of the depth, which is under an inch on a 3 inch slab.

Order a little over. A slab that is 4 by 10 on paper can be 4.1 by 10.2 after the forms are staked, and that is 10.5 cubic feet. Undercutting a pour by half a bag means a cold joint in the worst place, and a spare bag of mix is cheaper than a second truck.

The square feet column is 10 x 12 / thickness, with thickness in inches, and it is the fastest check on a bag count. A 4 inch slab needs 20 percent more concrete than the same area at 3 inches, which is one more bag for every five.

A 75 gallon boat tank holds 10.03 cubic feet

471 pounds of gasoline on the stern

Ten cubic feet is 74.8 gallons, and a tank sold as 75 gallons is 75 / 7.48051948051948 = 10.026 cubic feet. The label and the volume agree to within a quart, which is rare on a spec sheet.

Fuel weight matters more on a boat than fuel volume. Gasoline runs about 6.3 pounds per gallon, so 74.8 gallons is 471 pounds. Diesel at 7.1 pounds per gallon is 531 pounds for the same tank. Add the tank, the bracket and a four stroke outboard and the stern is carrying over half a ton before anyone steps aboard, which is why a tank moved forward changes how a hull floats at rest.

Range falls out of the same numbers. At 2 miles per gallon, 74.8 gallons is 149.6 miles with nothing held back, so the usable figure on a 10 percent reserve is 134.6 miles. A hull that makes 3 miles per gallon gets 224.4 miles from the same ten cubic feet.

Where the weight sits changes the hull. Moving 75 gallons from the transom to a tank under the console shifts 471 pounds about 6 feet forward, which is 2,826 foot pounds of trim on a 20 foot boat, and that is enough to change the running attitude and the bow spray. Vent, fill and sender are usually on the same plate, so the tank has to go in before the deck is screwed down.

Portable tanks follow the same rule. A 6 gallon jerry can is 0.802 cubic feet, so ten cubic feet is 12.5 cans, and 14.96 five gallon cans. Anyone ferrying fuel to a mooring knows that count better than the gallon figure, because cans are what the dinghy will carry.

Diesel is the case where the gallons and the pounds part company. Ten cubic feet of diesel is still 74.8 gallons, but it weighs 531 pounds and carries about 10 percent more energy per gallon, so the range at the same burn rate is longer than the weight suggests.

The weight columns are gallons times 6.3 and 7.1. They are the reason a 100 gallon tank is a 630 pound decision, and the reason a trailer tongue scale is worth borrowing before a long trip.

Four and a half kegs, fifteen buckets, one and a third drums

Containers counted against ten cubic feet

A half barrel keg holds 15.5 gallons, so ten cubic feet of beer is 4.83 kegs and the fifth one ends up 83 percent full. A sixtel holds 5.16 gallons, which stretches the same volume to 14.5 sixtels, and a five gallon bucket gives 14.96 fills, so fifteen buckets with a splash left over.

A Cornelius keg holds 5 gallons, which is 14.96 of them to the ten cubic feet, and the same shell takes 30 psi for force carbonation. Homebrew shops sell that keg as a corny, and the ball lock posts are the reason it fits a kegerator that a sanke keg will not.

A pony keg is the same shell as a half barrel, poured short at 7.75 gallons, so ten cubic feet is 9.65 of them. The deposit is the same, the footprint is the same, and only the fill changes, which is why the small keg costs more per ounce at every bar that carries both.

The drum line is where arithmetic surprises people. A 55 gallon drum holds 55 gallons, so ten cubic feet overfills one drum and needs 1.36 of them. Two drums hold 110 gallons, or 14.7 cubic feet, which leaves the second one 64 percent full.

Bigger tanks follow the same curve. A 100 gallon stock tank is 74.8 percent full at ten cubic feet, and a 275 gallon tote is 27.2 percent full, which is the sort of thing worth knowing before backing a truck up to it.

These counts are the ones to have in your head at a yard sale or a farm auction. A drum, a tote and a keg are all sold as containers, and the volume inside them is the only number that says whether the material will fit the job.

The last column is the remainder times the container size, and it is the one that decides whether a second trip is worth hitching. Four kegs and five sixths of a fifth is a party with one keg too few, so the order is five.

Ten cubic feet of soil in a raised bed

3.75 inches across a 4 by 8 foot bed

A 4 by 8 foot bed is 32 square feet, so ten cubic feet fills it 3.75 inches deep: 10 x 12 / 32 = 3.75. At 6 inches the same bed needs 16 cubic feet, and at 10 inches it needs 26.67, which is 13.3 bags of 2 cubic feet and a reason to buy bulk instead.

Mulch is the same arithmetic with a lighter material. A cubic yard of bark chip covers 324 square feet at one inch, so ten cubic feet covers 120 square feet at the same depth, and a 3 inch layer over a 4 by 8 bed takes 8 cubic feet. Mulch suppresses weeds at 2 to 3 inches, and a thinner layer mostly feeds them.

Bagged soil is sold by the cubic foot and bulk loam by the yard. Ten cubic feet is 0.3704 cubic yard, and a yard is nearly three times as much, so a bulk order for one small bed leaves a pile in the driveway. Five bags of 2 cubic feet is the cleanest match for this volume, with nothing left over and no pile to wheelbarrow away.

Weight decides whether the bed belongs on a deck. Moist loam at 80 to 100 pounds per cubic foot puts ten cubic feet at 800 pounds and up. Spread over 32 square feet that is 25 to 31 pounds per square foot, which most decks handle. The same volume in a bed 2 by 4 feet would be 125 pounds per square foot, which most do not.

A yard of compost covers 108 square feet at 3 inches, which is the whole of a 4 by 8 bed plus a second one. Buy compost by the yard for a bed and by the bag for a planter, and never the other way around.

Gravel and crushed stone run heavier than loam. At a bit over 100 pounds per cubic foot, ten cubic feet of crushed stone is close to half a ton, which is most of a half ton pickup payload and a load that sits the springs flat. Order it by the yard and have it dropped where the wheelbarrow can reach, because that weight is 35 barrows at 30 pounds a scoop.

Fill in two passes. Soil settles 10 to 15 percent after the first soak, so a bed filled to 3.75 inches will read 3.2 to 3.4 inches a week later, and the difference is 1.5 cubic feet, or most of a bag.

The bag column is square feet times depth in feet divided by 2, which at 6 inches comes to square feet x 0.25. It is there because a 4 by 8 bed at 6 inches takes 8 bags, and a 4 by 12 bed takes 12, and neither number is obvious from the bag label.

Boxes that measure ten cubic feet

Inside faces, not outside

Forty by eighteen by twenty-four inches is 17,280 cubic inches, so that crate is ten cubic feet. Four more sizes land on the same volume: 48 by 24 by 15, 60 by 24 by 12, 72 by 20 by 12 and 24 by 24 by 30. All five are real shapes, a shipping crate, a tote, a truck box, a planter and a cube.

A cargo trailer is the practical version. A 5 by 8 foot trailer with 24 inch sides holds 80 cubic feet, so ten cubic feet is an eighth of the load, about 3 inches of depth across the floor. A pickup with a 6.5 foot bed, 5 feet between the wheel wells and 22 inch sides holds about 60 cubic feet, and ten cubic feet disappears into it without changing how the truck sits.

Inside dimensions again. A plywood box built from 3/4 inch stock loses an inch and a half on each dimension, so a 48 by 24 by 15 inch shell measures 46.5 by 22.5 by 13.5 inside, which is 14,124 cubic inches, or 8.17 cubic feet. That is 18 percent short of the label, and it is the difference between one load and two trips.

Freight is priced on a different cubic foot again. A standard 48 by 40 inch pallet loaded 30 inches high is 57,600 cubic inches, or 33.3 cubic feet, so ten cubic feet is a third of a pallet and a carrier will bill it at the pallet rate anyway. Stack to the pallet height before paying for air.

A gaylord, the pallet sized carton a forklift moves, holds about 60 cubic feet with a plastic liner, so ten cubic feet is a sixth of one. A supersack of sand is 1 cubic yard, close to three times this volume, and the loop lift on the bag is the only way to move it without a shovel.

Build oversize when the volume is a target rather than a limit. A box intended to hold ten cubic feet of loose material should be about 20 percent larger, because sand, soil and gravel do not pack to the geometric volume and a brimful box spills in transit.

The last row is the same footprint with three inches less height, and it is the size most totes and truck boxes turn out to be. Ten cubic feet of gravel does not fit it, and the shortfall is two cubic feet, or about 15 gallons.

Water weight, floor load and price per gallon

624 pounds, 62 pounds per square foot

Ten cubic feet of water weighs 624 pounds at 62.4 pounds per cubic foot, the figure the USGS Water Science School prints for cold water, or 623.1 pounds through the gallon route at 8.33 pounds per gallon. Fill a 100 gallon stock tank that holds 13.37 cubic feet and the water alone is 834 pounds before the tank, the lid and whatever is swimming in it.

Floor load is the number to check. Spreading 624 pounds over 10 square feet of floor is 62 pounds per square foot, and a residential floor is usually designed for 40 pounds per square foot. A tank standing on 4 square feet is 156 pounds per square foot, which is a point load, not a distributed one, so the tank belongs against a bearing wall or over a beam rather than in the middle of a span.

Price behaves like volume. At $1.10 per gallon, ten cubic feet is 74.8052 x 1.10 = $82.29, and the same rate is $8.23 per cubic foot. Bagged concrete at $7.25 for 80 pounds works out to $12.08 per cubic foot, so 17 bags for this volume is $123.25, which is more than the liquid price for the same space.

Delivery is the line that flips the comparison. A yard of loam at $46 plus a $90 delivery is $5.04 per cubic foot on a full yard, and $1.70 per cubic foot of material with the fee spread over 27 cubic feet. Order ten cubic feet instead and the same fee sits on a tenth of the volume, which is how a cheap bulk price turns into an expensive small load.

Compare three quotes by putting them all in cubic feet first. A price per gallon, a price per cubic foot and a price per cubic yard cannot be compared until one of them moves, and the factor for gallons is 7.48051948051948 while the factor for yards is 27.

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