Shelter & Sleep Calculators
Tent footprint, tarp sizing, hammock hang angles, R-value calculations and bivvy bag sizing.
Tent Footprint Calculator
Calculate the ground area and footprint dimensions for your tent setup.
Tarp Size Calculator
Determine the right tarp size for your shelter configuration and number of occupants.
Hammock Hang Calculator
Calculate the ideal hang angle, ridge line length and tree distance for your hammock.
Ground Pad R-Value Calculator
Calculate combined R-value when stacking sleeping pads for cold weather camping.
Sleeping Pad Calculator
Find the right sleeping pad size and type based on your height, width and conditions.
Bivvy Bag Calculator
Calculate the right bivvy bag size and temperature boost for your sleeping system.
Guy Line Calculator
Calculate the total guy line length needed for your tent or tarp setup.
Tent Ventilation Calculator
Estimate ventilation requirements to reduce condensation inside your tent.
8 free calculators in Shelter & Sleep
Shelter and Sleep Systems for Camping
A good night's sleep is essential for enjoying multi-day outdoor trips. Your shelter system, including tent, sleeping bag and sleeping pad, needs to protect you from rain, wind and cold while being light enough to carry.
Hammock camping has grown significantly in the UK. The ideal hammock hang uses a 30-degree strap angle, which creates a comfortable lay angle and keeps the hammock at a good height. Our hammock hang calculator works out the exact tree distance and strap lengths you need.
Sleeping pad R-value measures thermal resistance — the higher the R-value, the more insulation from the cold ground. For UK three-season camping, an R-value of 3-4 is typically sufficient. For winter camping, aim for R5 or above. Stacking pads adds their R-values together.