Air calculator uses the geographical coordinates of the airports to measure distances. This is multiplied by a coefficient that relies on the most recent DEFRA data to determine amount of energy consumed through burning jet fuel and the multiplying impact of other Greenhouse Gases released at high altitudes (RFI) of 1.9.

Hotel room calculator assumes a standard 4/5 star hotel room of 33 square meters (355 square feet). Each night is multiplied by a coefficient that takes into account average energy usage for the region selected and the embodied energy for the building and fittings. The figure includes staff and guest consumables such as newspapers, laundry and hotel fleet cars but excludes food, and guest travel to/from the hotel.

Car rental calculator assumes a 6 cylinder petrol engine car driving 120km (75 miles) each day it is rented. This calculation also takes into account the embodied energy of the car.

Cruise ship calculator assumes ship occupancy rate of between 80-95% depending on ship type. The calculation assumes a deluxe room of 100-150 square feet and includes the embodied energy for the ship itself and fittings onboard. The figure also includes the multiplying impact of other Greenhouse gases such as Nitrous Oxide.

Tour calculator assumes that each passenger travels 350km (218 miles) per day on a 36 seater diesel engine bus and spends each night in a standard 4 star hotel room of 33 square meters.