I reciently got a Polar A5 and used it on my last ride. I rode in zone for 2hr 13min (2hr 30min total) with an average HR of 146. Anyways the monitor said I had burned 1819kcal, and I'm wondering if that's a reasonable estimate? It asked for my height, age, and weight. I also checked my HR manually and that matched up to the Polar readings.
I'm 18 years old. 5'9 at 164lbs.