What's piling up on your roof
If you're standing in your driveway looking at your roof and doing math on how many shingles are up there, you're already ahead of most people who call around Springfield in a panic halfway through a tear off. Shingles are heavier than they look, and old three-tab or architectural layers that have baked through a few Ozark summers and frozen through a few ice storms don't come off light. They come off brittle, waterlogged in spots, and often stacked two or three layers deep because a lot of homes in this area got a second or third roof laid right over the first one instead of a full strip.
That habit of layering is the first thing that throws off container sizing. A homeowner looking at a single-story ranch off Republic Road might assume one layer of shingles means a small container will do. Then the crew starts tearing off and finds two more roofs underneath, put on sometime in the 80s or 90s before code got stricter about it. That changes the weight and the volume fast.
Why Springfield roofs run heavier than you'd guess
Southwest Missouri weather is hard on shingles. Summers push into the high 90s with heavy humidity, which cooks the asphalt and dries it out unevenly. Winters bring ice storms that can crack shingles and let water sit underneath. Spring hail is common enough that most roofers here have a season built around it. All of that means shingles in this region often come off heavier and more waterlogged than the same age roof would in a drier climate, because they've absorbed more moisture over the years.
A house built in the 1960s or 70s in an older Springfield neighborhood, with the original wood shakes replaced decades ago by asphalt, may have more debris than a newer build out in Nixa or Ozark. Older homes also tend to have more roof penetrations added over time, chimneys, vents, old antenna mounts, which adds odd bits of debris that take up space without weighing much.
More on this from Sizing A Container For A Shingle Tear Off.
What actually fills a container
Square footage of the roof matters, but so does pitch. A steep pitch sheds water fast, which is good for the house, but it also means more surface area than the footprint of the home suggests. Two houses with the same floor plan can have very different roof areas if one has a 4/12 pitch and the other has an 8/12 pitch, common in some of the older subdivisions with more traditional rooflines.
Number of layers is the other big variable. One layer of standard three-tab shingles is a very different job than tearing off two or three layers plus old felt paper, especially if there's plywood decking underneath that also needs replacing because of rot or hail damage. Underlayment, flashing, and any rotted decking all add to the pile, and none of it is light.
What you can check before calling anyone
You can get a rough sense of your own situation without climbing up there. Look in your attic for signs of how many roofing layers exist, sometimes you can see nail patterns or edges from the underside. Pull your property records or ask a neighbor who's had work done recently if permits are on file, since some show roof history. Walk the perimeter of the house and note the roof's pitch by eye, steep roofs are obvious even from the ground.
Take photos of any obvious problem spots: sagging areas, missing shingles, or spots where moss or algae has taken hold, which is common on north-facing slopes here given our humidity. These details help whoever you're working with size things accurately instead of guessing.
Where this stops being a homeowner call
Estimating the weight of tear-off debris isn't really a guessing game you want to play alone, because getting it wrong has real consequences. Underestimate the volume and you're paying for a second haul. Underestimate the weight and you can run into overage charges that surprise people who didn't know shingles could weigh that much. This is where it makes sense to let whoever is doing the roofing work, or whoever you're renting a container from, walk the roof or at least look at photos and ask direct questions about layers and pitch.
If your roof has any history you're unsure about, previous storm damage, a past insurance claim, or work done by a previous owner you never got documentation for, that's worth mentioning up front. Nobody sizing a container from the street can account for what they can't see, and in a region where hail and ice storms are routine, that hidden history is common enough that it's always worth asking about before the tear off starts.