I have a kind of bicycle trainer.

It shows me the Watt of power (mechanic) and average.

Say I was doing 100 Watt for 1 hour so I have 100 Watt hours or 360.000 Joule. How can I calculate the burned Kcalorie. I can of course calculate the Joule to Kcal but that would be wrong because I burn more than it because of the bad efficiency of the body (I guess 30%). Anyone know the formula?

0,1 kWh = 360.000 J = 85,984 kcal

You produce 100 Watt's, the cal's you burn, ???

0,1 kWh = 360.000 J = 85,984 kcal

You produce 100 Watt's, the cal's you burn, ???

Unbelievable, the manufacturer answered me (I wrote them an email, never believing I get an answer).

Here what they told:

When someone 10 minutes with a power of 200 watts has been cycled

the energy consumption

200 watts = 200 Joules / sec. x 600 sec. (10 min.) = 120,000 Joules = 120 kjoule

: 4,18 = 28.7 kcal x 4 = 115 Kcal.

The average yield of the human body is 25%.

Therefore, the energy consumption is multiplied by 4

so on your calculation the body would have burned 344 kcal (of course just approx. not exactly).

Watch you don't burn the light bulb at both ends!