Work out tent size for group instantly with clear inputs, formula shown and shareable results.
Internal width is the number of sleepers times their shoulder allowance, plus a strip for gear, and the floor area multiplies that by the sleeping length. Manufacturer capacity ratings assume shoulder-to-shoulder sleeping with no gear, which is why buying one or two sizes above your group size is standard practice.
Width needed
width = sleepers x shoulder allowance + gear strip
Floor area
area m2 = width cm x length cm / 10,000
width = sleepers x shoulder allowance + gear strip. Internal width is the number of sleepers times their shoulder allowance, plus a strip for gear, and the floor area multiplies that by the sleeping length.
Manufacturer capacity ratings assume shoulder-to-shoulder sleeping with no gear, which is why buying one or two sizes above your group size is standard practice.
Enter number of sleepers, shoulder width allowance each, sleeping length needed, include space for gear inside. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.