The first thing that you need to consider in acquirng for a car insurance is to know its price quotes there you can have the idea about the cost, technical features, terms and conditions and even the insurance covered of your car insurance plan. Different car insurance companies have different insurance coverages so better have a automoble price quotes first to know your car insurance coverage. So if the damage is not really a big burden somehow fixing it by yourself can be helpful and when there's a big big trouble you can use your insurance claim.

Your coverage limit for collision is your car value. It is that simple. 

You will have to pay your deductible which should be $250 or $500. The rest entirely covered. If the repair cost is higher than the value of your car, it is then a total loss. In this case, the insurer will give you cheque of the value of your car.

guest said

My rear bumper got smashed. How much does insurance usually cover when getting something like this fixed?

The car is an 08 BMW 325i (white).

just looking for approximate answers here…

What hasn't been already mentioned is whether or not this was your fault or someone else smashed into the back of you. If another driver was at fault, their insurance should cover the entire cost of the damage. You'd most likely need to get a few estimates and they'll try to pay you the lowest estimate. Some insurance companies have service centers that will handle the repair itself so you won't actually get any money, just a new bumper.

It's hard to give you a more specific answer when there are details missing in the question.