How the math works

Trick-or-treaters × pieces each, plus your buffer, rounded up to whole pieces. Divide by the pieces in one bag and round up again. That's it. The hard part isn't the math; it's the first number.

Don't know how many to expect?

Almost nobody does, and that's why bowls run dry. Your count depends on your street, your sidewalks, how many houses near you light up, the weather, and what day Halloween falls on. Nothing online can tell you your porch's number. We wrote up what actually drives it.

The reliable way is to count once. Tap once per kid this Halloween, and next year this calculator starts from your real number instead of a guess.

Curious how other porches did? See how much candy porches bought, and when they ran out.