Dumpster Size Calculator
Pick the right roll-off by volume AND weight — rooms, squares or cubic yards in, box size and ton-limit check out.
Pick the right roll-off by volume AND weight — rooms, squares or cubic yards in, box size and ton-limit check out.
Project type
Rooms of household junk — furniture, boxes, bags. A typical bedroom counts as one room.
Choose a project type and enter its size to see volume, weight and the right box.
Frequently asked questions
What size dumpster for a garage cleanout?
Most garages hold the equivalent of 2–4 rooms of household junk. At the planning rate of 1.2 cubic yards per room that is 2.4–4.8 yd³, and with the 15% safety buffer you land between 2.8 and 5.5 yd³ — comfortably inside a 10-yard dumpster whose 2-ton limit is nowhere near binding. Only count a genuinely packed, floor-to-ceiling garage as more than two rooms.
How many squares of shingles fit in a 10-yard?
By volume, 10 yd³ ÷ 0.75 yd³ per square is 13 squares raw — about 11 squares once the 15% buffer is respected. Weight is not the binding constraint: 16 squares × 250 lb = 2 tons exactly matches the box limit, but volume fills first. An intact single-layer roof up to ~11 squares fits one 10-yard box; tear off more than that and step up to 20 yards.
Why do concrete and dirt need special dumpsters?
Weight, not volume. Concrete runs about 2.0 tons per cubic yard and dirt 1.1 — ten cubic yards of concrete weigh 20 tons, more than five times what a 20-yard box is rated for (3.5 tons). That is why heavy debris is restricted to 10-yard boxes rated near 2 tons: you pay for more hauls, not for an axle-snapping truck. And never bury concrete under light debris — drivers refuse overweight loads at the landfill scale.
What happens if I exceed the weight limit?
The hauler weighs your loaded box at the landfill scale and bills overage per ton beyond the included limit; a drastically overweight box can also be refused at pickup entirely, leaving it — and its rental clock — on your driveway. The estimator's weight line exists exactly for this moment: when the tons get close to the box limit, take the next size or plan multiple hauls.
10 vs 20 yard dumpster — how do I choose?
Volume doubles from 10 to 20 yd³ but the weight rating only rises from 2 to 3.5 tons, while price usually rises far less than volume — which makes the 20-yard the default for mixed renovation debris. Stay with the 10 when heavy materials are involved (it is the legal ceiling anyway) or the job is small: a three-room cleanout buffers to just 4.1 yd³. Step up the moment buffered volume or tonnage comes within one small load of the 10's limits.
How the size estimate works
Two numbers decide the box: volume and weight. Volume sets how much space the debris takes; weight decides whether the hauler can legally lift it. Most tools check the first — the second is where overweight fees come from.
1. Volume: cleanout and remodel count 1.2 and 2.5 yd³ per room; roofing counts 0.75 yd³ per square. 2. Weight: 0.15 and 0.25 tons per room of cleanout or remodel debris; shingles 0.125 tons (250 lb) per square; concrete 2.0 and dirt 1.1 tons per cubic yard. 3. Buffer: volume gets a 15% margin for the odd pallet you forgot. 4. Match: the smallest box whose capacity covers the buffered volume AND whose weight rating covers the tonnage.
Worked example — a 20-square shingle tear-off:
Volume: 20 squares × 0.75 = 15 yd³; with the 15% buffer, 17.25 yd³. Weight: 20 × 250 lb = 5,000 lb = 2.5 tons. A 10-yard box fails on volume (17.25 > 10); a 20-yard passes both (17.25 ≤ 20; 2.5 ≤ 3.5) — so the answer is a 20-yarder, one trip.
Weight limits and heavy debris
Dumpster weight ratings come from road law, not from the box: a 10-yard roll-off is rated near 2 tons, a 20-yard near 3.5, a 30-yard near 4.5, a 40-yard near 5.5. Exceed the rating and the hauler pays an overweight ticket at the scale — which they pass back to you with a margin.
Concrete (2.0 t/yd³) and dirt (1.1 t/yd³) live in a different weight class than household junk (0.15 t/yd³): one cubic yard of concrete outweighs thirteen cubic yards of garage junk. That is why this calculator hard-caps heavy debris at the 10-yard box and quotes the job as multiple hauls instead of pretending a 40-yarder will do.
Rates are planning averages for US roll-off service. Your hauler's exact limits and overage fees vary by region — the contract wins.
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