Originally Posted by Looigi

Garmin calorie calculations are primitive and notoriously far off, usually over by 50% or more. I have a Garmin but use an equation plugging in gender, age, weight, Avg HR, and duration. I checked the eqn against calories determined by doing some rides with a power meter and found that for me I needed to correct the equation downward by multiplying by 0.7.

Calories Burned = [[(years x 0.2017) + (lbs x 0.09036) + (BPM x 0.6309) - 55.0969] x minutes / 4.18] x 0.7

On my typical ride I burn 600-700/hr.