Is my stationary bike accurate?

Hey,

I am relatively new to fitness. I have been overweight for bout 10 years now, and wanted to get back in shape.

I bought a stationary bike last year, the ProForm 10.8X and it has a calories burned feature/heart rate monitor, but I am not all that sure if it is accurate.

I also bought a heart rate watch, the Sportline Cardio 630, but I am not sure if this is accurate too.

Here is what I did:

Bike: 5 min warm up.
25 min. Level 8/10 resistance at 15 mph
5 min cool down.

The bike said I burned 240 calories, but my watch said I burned 540.

The watch keeps track of your weight and height, but the bike does not. Which one is accurate? That is a huge difference.

Also if it helps I just had on my watch/chest strap while resting for 30 minutes after waking up and it says I burned 85 calories. This seems way high.

If it helps here is my stats:

Male.
25.
215 pounds.
Resting heart rate is 60-65.
During the workout my heart rate was 150-175.

Thanks!
 
Sorry, but neither of those are very accurate. There are so many factors to take into account when calculating calorie expenditure that a small piece of equipment generally can't give an accurate reading at all. However, the more information input that these devices receive (height, weight, workout intensity, etc.) the closer it will be. Still, I wouldn't put too much faith in these things.
 
I used to have an exercise bike and both the calories burned and heart rate was a joke! Very inaccurate and at times it would show no heart rate at all and at other times when my heart was racing it would say my heart rate was just 70bpm. Ignore these indicators. A machine would need to have way more info to calculate your calories burned including your weight, metabalic rate, fitness level etc
 
This is really a big difference and if it continue then i would like to say that those stuff will not give you any more accurate result. I would like to suggest you that you need to forget the result of those stuffs and keep focusing on regular exercise. When you loss your health you would fell the difference by yourself.
 
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