Dumpster Size Calculator

What size dumpster do I need for a bathroom remodel?

Debris volume, not room size, decides the container. Strip a bathroom to the studs and the pile is a tub or shower surround, wall tile and backer board, a vanity, a toilet, a mirror, floor covering, and the drywall behind all of it. Estimate it the way you would estimate any pile: length × width × average loose height in feet, then divide by 27, because one cubic yard contains 27 cubic feet. If the loose pile measures 8 ft × 6 ft × 2.5 ft, that is 120 ft³, or 4.44 yd³. This calculator recommends the smallest standard roll-off that holds your estimate, so 4.44 yd³ lands in a 10 yd³ container with room left for the odd surprise.

Two things can push a small bathroom into a larger container. The first is weight. Wall tile, mortar bed, cast iron, and plaster are dense, and haulers publish a debris weight allowance for each size: one national hauler lists under 5,000 lb for its mini roll-offs and 5,000–8,000 lb for a 20-yard box [3]. The second is scope creep, because once a wall opens, subfloor, lath, or a second vanity often join the pile. If you are close to the edge of a size, price the next size up against the cost of a second pull, and remember that a larger box loaded partway is usually cheaper than two hauls of a small one.

How many cubic yards is a 20 yard dumpster and what are its dimensions?

A 20-yard roll-off is rated at 20 cubic yards of loose debris, which is 540 cubic feet, since 20 × 27 = 540. Published dimensions vary by hauler and by the roll-off truck that carries the box. One national hauler lists 22 ft long × 8 ft wide × 3.5 ft high for its 20-yard container, 22 × 8 × 6 ft for a 30-yard, and 22 × 8 × 8 ft for a 40-yard [3]. Multiply the 20-yard figures and you get 616 ft³, slightly above the nominal rating, which is normal: nominal capacity describes usable loose volume below the rim, not the geometric volume of the steel box. Plan to the rating, never to the tape measure.

Footprint matters as much as capacity. A 22-foot container needs a straight approach considerably longer than the box itself so the truck can winch it off and reload it, plus overhead clearance for the hoist arm. Ask the hauler for the exact delivery footprint, because trucks and cable systems differ. Measure driveway width, note low branches and utility drops, and check whether your city requires a permit for placement in the street or right of way. A container you cannot legally set is worse than one that is slightly small. Put plywood under the rails to protect a finished driveway, and point the swing door toward where the heaviest pieces will be loaded.

How much does a cubic yard of construction debris weigh?

It depends entirely on the material, which is why volume alone never settles the question. EPA's standard volume-to-weight conversion factors put rock and gravel at 999 lb per cubic yard, dirt and sand at 929 lb, concrete at 860 lb, asphalt paving at 773 lb, composition roofing at 731 lb, gypsum board at 467 lb, mixed construction and demolition remainder at 417 lb, and clean dimensional lumber at only 169 lb [2]. That is a spread of nearly six to one across materials that all measure the same cubic yard. Ten cubic yards of concrete therefore weighs 10 × 860 = 8,600 lb, or 4.3 tons, while the same ten cubic yards of clean framing lumber weighs just 1,690 lb.

Compare that arithmetic against the container's published debris allowance and the limiting factor becomes obvious. Fill a 20-yard box with composition roofing tear-off and EPA's factor gives 20 × 731 = 14,620 lb, well past the 5,000–8,000 lb range one hauler publishes for that size [2][3]. Fill the same box with mixed C&D remainder and you get 8,340 lb, right at the top of the range. Fill a 30-yard with clean dimensional lumber and you reach only 5,070 lb, comfortably inside an 8,000–12,000 lb allowance. Dense material fills a container by weight long before it fills by volume, which is why haulers often send a small box for concrete, dirt, and shingles.

What can you not put in a rented dumpster?

Acceptance rules are set by your hauler and by the receiving landfill or transfer station, so the definitive list is local. In practice, liquids, paints and solvents, fuels, pesticides, batteries, tires, refrigerant-bearing appliances, medical waste, and anything containing asbestos are commonly excluded from general roll-off service and routed to a separate program. Household hazardous waste collection events, appliance recovery programs, and licensed abatement contractors exist precisely because those streams cannot ride in a mixed load. Ask for the prohibited-items list in writing before the box arrives, and post it where the crew loads, because a single contaminated load can trigger a special-handling charge against the whole pull.

Separation can also work in your favor. EPA reports that 600 million tons of construction and demolition debris were generated in the United States in 2018, more than twice the amount of municipal solid waste, and that roughly 143.8 million tons of it went to landfill while the remainder went to aggregate, manufactured products, fuel, compost and mulch, or soil amendment [1]. Clean concrete, clean wood, metal, and cardboard often have their own outlets, sometimes at a lower tip fee than mixed debris. If your project produces a large single-material stream, ask whether a dedicated container beats one mixed box. This calculator sizes a single container, so run it once per stream if you separate.

How do you estimate debris volume in cubic yards for a demolition project?

Build the estimate from components instead of guessing a size. Drywall: wall and ceiling area in square feet × thickness in feet, then multiply by a break-up factor because broken board does not stack flat. Roofing: tear-off area divided by 100 gives squares, which you convert to volume using the loose pile you actually expect. Framing lumber: count linear feet and convert to a measured stacked volume, remembering that EPA's 169 lb per cubic yard means lumber is bulky but light [2]. Flooring, cabinets, and fixtures are easiest to estimate as a measured pile. Add the component volumes in cubic feet, then divide the total by 27 once, at the end, rather than rounding at every step.

Work a kitchen. Wall and ceiling drywall of 320 ft² at 1/2 inch is 320 × 0.0417 = 13.3 ft³ solid, but broken board stacks loosely, so at a 3× break-up factor plan about 40 ft³. Cabinets and countertops measured as a pile of 10 ft × 4 ft × 3 ft add 120 ft³. Flooring and underlayment at 200 ft² × 0.1 ft loose is 20 ft³. Appliances and jobsite trash add another 60 ft³. Total 240 ft³, and 240 ÷ 27 = 8.9 yd³. That fits a 10-yard box on volume, but if the countertops are stone, check weight first: 8.9 yd³ of aggregate at 999 lb per cubic yard would be 8,891 lb [2].

What are the standard roll-off dumpster sizes and dimensions?

Dimensions and weight allowances are one national hauler's published figures [3]; both vary by hauler and by local road weight limits. Loose volume is nominal size × 27 ft³. This calculator recommends from the 10, 20, 30, and 40 yd³ sizes.

How much does a cubic yard of each debris type weigh?

Densities from EPA's standard volume-to-weight conversion factors [2]. One ton equals 2,000 lb. Real loads vary with moisture, particle size, and how tightly material is packed.

Does a dumpster fill up on weight or on volume first?

Calculated weight = container yd³ × EPA density factor [2]; allowances are one hauler's published ranges [3]. Bulky light debris fills by volume; dense demolition rubble fills by weight.

Work these out first

• how much debris the waste factor impliesProject Waste Factor Calculator

What to do with this result

• disposal as a budget lineProject Budget Calculator

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