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MaterialCalc — Construction Dumpster Size & Cost Calculator

Estimate prepared 09/01/2026. Estimates only; verify against your plans before ordering.

Construction Dumpster Size & Cost Calculator

Loose volume, as it will sit in the container.

Weight, not volume, is what triggers overage charges.

Typically 2 to 4. Anything over is billed per ton.

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Debris does not stack neatly and cannot go above the rails.

Result

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Dumpsters are ordered by volume and billed by weight, and that is where the surprises come from. A 20 yard box of drywall and framing is comfortably inside its tonnage; the same box of roofing shingles is double it. This sizes the container for your debris and tells you whether you are about to blow the weight allowance.

Assumptions used

These are the numbers behind the result. Where one of them is soft, the cost range widens rather than pretending to a precision the data does not have.

Usable dumpster fill
0.8

Debris does not stack neatly and cannot be loaded above the rails.

Roll-off rental company guidance — Industry standard, varies by supplier, checked 09/01/2026

Mixed construction debris density
40 lb/ft³

Mixed light debris. Concrete, plaster and roofing are several times heavier.

EPA construction and demolition debris factors — Rough figure — widens the estimate range, checked 09/01/2026

Prices verified 09/01/2026 (US national average, big-box retail shelf price and regional ready-mix quotes). Regional adjustment: Blended from RSMeans city cost index bands and BLS construction wage differentials.

The formula

Container volume = debris volume plus a fill allowance, divided by the 80% of the box you can actually use. Weight = debris volume in cubic feet × density: about 40 lb/ft³ for mixed light debris, 120 for roofing, 250 for concrete and masonry. Overage = weight minus the tons included in the rental.

Worked examples

12 yards of mixed remodel debris

Debris volume (cubic yards): 12 What the debris is: light Tons included in the rental: 3 Fill allowance: 25

About 19 yards of container needed — a 20 yard box. At 40 lb/ft³ the weight is comfortably inside a 3 ton allowance.

12 yards of roofing shingles

Debris volume (cubic yards): 12 What the debris is: roofing Tons included in the rental: 3 Fill allowance: 25

Same volume, same box — but roughly 19 tons. Massively over the allowance, which is why roofing dumpsters are quoted differently.

4 yards of broken concrete

Debris volume (cubic yards): 4 What the debris is: heavy Tons included in the rental: 5 Fill allowance: 25

Small volume, 13 tons. Concrete needs a dedicated box with a higher weight allowance, and most haulers will not mix it.

Choosing materials

  • You cannot load above the rails. Haulers will not take an overfilled box, and a load that has to be pulled down on site costs a trip charge and a day.
  • Weight allowances are typically 2 to 4 tons, and overage runs $60 to $120 per ton. On a roofing job that overage can exceed the rental itself.
  • Concrete, brick and dirt usually need a dedicated low-sided 10 yard box. Many haulers refuse them mixed with general debris because a full 20 yard box of concrete is over the truck's legal weight.
  • Order one size up if you are between sizes. The price difference between a 20 and a 30 is far less than the cost of a second haul.
  • Check the placement before delivery. A loaded roll-off weighs several tons on two wheels and will crack a residential driveway. Plywood under the wheels is the usual mitigation.

Common questions

What size dumpster do I need?

Take your debris volume, add about 25% because it will not stack neatly, then divide by 0.8 since you cannot fill above the rails. A 12 yard pile needs roughly a 20 yard box.

How much does a dumpster rental cost?

Roughly $380 to $500 for a 10 yard, $480 to $650 for a 20, and $600 to $850 for a 30, including a weight allowance of 2 to 4 tons and about a week of rental. Overage runs $60 to $120 per ton.

How much does construction debris weigh?

Mixed light debris — drywall, framing, trim — runs about 40 lb per cubic foot, so a cubic yard is roughly half a ton. Roofing shingles are three times that. Concrete and masonry are six times, which is why they need their own container.

Why do I need a separate dumpster for concrete?

Because a full 20 yard box of concrete weighs more than the truck can legally carry. Haulers use low-sided 10 yard boxes for masonry with a higher tonnage allowance, and most will not accept it mixed with general debris.

Can I overfill a dumpster?

No. Debris must sit below the top rail so the tarp can go over it. An overfilled box is refused at the curb, and you pay a trip charge plus the time to pull the load down before it can be taken.

How long can I keep a dumpster?

Most rentals include 7 to 10 days, with a daily rate after that of around $10 to $20. If the job is going to run, negotiate the rental period up front rather than paying the extension rate.

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