Dumpster prices vary from state to state and town to town. Of course the larger the dumpster, the more it will cost. Dumpsters come in four basic sizes, 10-yards, 20-yards, 30-yards and 40-yards. These are measured in cubic yards of trash. Weight is the key factor when determining how much an Northville Twp.Dumpster Rental will cost. Most dumpster rental companies charge a flat rate for the dumpster. You are usually allowed 4 tons that is included in that price. Once weighed at the landfill or transfer station, if the dumpster weight is over 4 tons, you will be charged a per ton charge for the overage. This per ton charge depends on the cost to dump at the local landfill.