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Old 06-12-05, 02:44 PM   #1
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I am trying to calculate the amount of watts I am putting out. Do any of you know a formula that it can use with my weight, speed, wind speed that would tell me how many watts I am using.
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Old 06-12-05, 04:29 PM   #2
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Yes, but it's not that simple to do just like that.

To be able to get a decent estimate, you'd need to provide:
body size (seen from the front)
bike's weight
tyre size and tread
road condition
terrain profile
wind speed and heading relative your direction of travel

Even then, I'd say the margin of error is probably 30% or so...
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Old 06-12-05, 10:39 PM   #3
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Just get a professional measurement done by a sports facility or kinesiology lab at a university or a performance testing facility. Then it'll be accurate!

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Old 06-12-05, 10:48 PM   #4
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for a road bike. If you can find a shop with a computrainer set up you can see what you can do on a stationary bike. Doesn't really help a lot but it is interesting. On the Giro recently a couple of cyclists had power meters on their bikes with remote readouts that were occasionally displayed on the screen and a few years ago on the HP ladies tour in Idaho, one of the ladies had the same and was running 200 to 400watts (400 were chases up short hills to reestablish contact with the peloton).
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