Purchase a tent capacity greater than the actual number of people sleeping in the tent. For example: One person = large two-person tent or small three-person tent. Two people = large three-person tent or small four-person tent. Three to five people = large six-person Six people = eight+ person tent You can also measure the floor space and height to determine how much space you need. Ideally, a family tent floor space should be at least big enough for a double-bed air mattress and two single sleeping pads, or 80 x 100 square feet. Make sure the minimum peak interior height can allow you to stand upright comfortably. On average, each person needs about 24 x 76 inches of space. You can figure out how many people your tent can comfortably accommodate based upon its floor dimensions.