How can I quantify the amount of calories I'm burning as a result of my daily workout?

Every day I do anywhere between 16km/38min to 30km/72min. I want to know precisely how many calories I'm burning. Is this possible?

Thanks for any help!

Edit: Someone already showed me this site but it's no good for me because I have no idea whether my workout is vigorous (200watts) or moderate (150watts).

Edit2: I workout using an exercise bike.

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Are you running, walking, dancing, swimming, or cycling? They all have different amount of calories burnt per KM.

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Is running 16km in 38 minutes even possible.... that's about 16 miles an hour.

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It's possible if you are on a trwadmill on the back of a truck

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Sorry... Forgot to mention that I'm using an exercise bike. It's on resistance setting five, with eight being the hardest.

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