I find the sparknotes calorie counter for cycling to be a gross overestimate. The best way to get an idea of the amount of calories your burning is by measuring your power. If you have a means of doing this (gym bikes and spin bikes usually have power meters) than I suggest doing a few workouts on one and getting an idea of how hard your working at different power levels. Once you have an accurate idea of exertion vs power output its very simple. Just multiply your power out put (in average watts/hour) by 3.6 and presto. You have your hourly calorie expenditure! Example. If I ride at 200 watts for 2 hours. 200 watts * 3.6=720 Calories per hour Now, if I want to learn my total calories expended...... 720 calories per hour * 2 hours=1440
200 watts is a pretty high power output for a non-racer but it was a nice round number for the example lol.
original poster- If you pm me I'll give you a fairly accurate estimate of you average calorie expenditure on the bike.
My HRM and SP give me pretty much the same total of calories burned, and with different lengths and intensities of riding. I tend to ride at about 25kms/hr for a 40 minute ride, and 22 for an hour or more.
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Fitness Minutes: (2,602) Posts: 26 9/14/10 9:23 P
If you ride in an area like I ride in where there are hills everywhere you can burn quite a few calories biking!! Just one more reason among many why it's my exercise of choice. I use a Polar HRM too and find it very helpful to track calories burned but also to help me push a little harder.
If you use the -Cycling-Under 10 mph- category in the SP fitness tracker you will get much closer to what you HRM is telling you.
I realize you were going about 10.5 mph on your shorter (15 mile) ride, but using the under 10 mph category, I came up with something like 425 cals burned. If you enter in 150 minutes at this rate, it comes out to 749 calories.
Hope that helps.
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Fitness Minutes: (35,633) Posts: 1,187 9/14/10 5:13 P
I think your Polar is closer to right, and is in line with the values I get off my Garmin HRM. www.nutristrategy.com/activitylist.h tm gives the calories burned per hour for different activities. You're going ~10 mph, so ~250 calories/hr. Therefore, 350 for the 15 mile ride, and 625 for the 24 mile ride. It's frustrating, but cycling just doesn't burn as many calories per hour as a lot of other activities. Plus, I'd rather underestimate than overestimate my calories burned.
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