[pjuarez]

Has anyone ever seen a formula or "rule of thumb" for the number of miles a typical Spinning class might equate to. I know it's different for every class, but I'm just looking for an average to put into my weekly mileage spreadsheet.

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[Big R]

Sorry...impossible to calculate. That's one of the interesting things about spinning--everyone gets a unique workout.

The only suggestion I would have would be to use a heart rate monitor OUTSIDE for about the same amount of time as your class, then try to duplicate the effort INSIDE.

Good luck

[park]

We all want to get proper credit for the miles logged, but it probably isn't that important unless your goal is to improve endurance. I did a hard workout on my trainer last night and I have no idea what kind of miles I did. Instead I focused on the amount of time spent doing work at certain heart rates and wattages.

[SSP]

Most users of my CycliStats software only log their time for spinning class and stationary trainer rides, and leave the miles field blank.

As others have noted, you can't accurately calculate equivalent "mileage" for indoor rides, and it doesn't seem right to me to claim to have ridden 4000 mile in a year, if 500 or so of those "miles" were done on a stationary bike.

[RiPHRaPH]

that's a toughie. i have a HRM that calculates calories burned, so i try and equate it with a ride i've done, but the terrain of the jump-up's, etc. is tough to match to a specific ride.
a 55-60 minute ride, repleat with warm up and cool down i log as 15 miles. so every 10 sessions is 150 miles for me. if i do 5000 miles a year, then less than 10% of them are indoor miles, so guesstimate so i know, but i tend to count rides per year. 300 rides per year is great for me,.