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Do you know how much water you need to store if you don't have water from the authorities? Find out here.
Are you trying to work out how much solar energy you need? try these calculators.
Body Mass Index calculator - a height/weight ratio
Randomise your workout for that extra bit of fun.
How much water do you need to drink? Use this calculator to find out.
Calculate your Body-Fat Percentage
Calculate what your body shape is
Random gift name generator - similar concept to secret santa
