You might jump on the scales every morning, fingers crossed behind your back for an acceptable number, but do you know how you measure up in terms of your waist circumfrence? Do you know how much your body burns every day just getting around (because, yes, breathing and walking to the fax machine all burns kilojules)? If you don't, check out these nifty calculators.
They're very useful figures to know if you're serious about weight-loss. Your BMI might not always be the most accurate indicator of good health – it doesn't know how much of you is fat and how much is muscle – but, as Shakira would say, your hips don't lie.