Heartrate Monitor On Treadmill

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I have a Garmin Forerunner 305 with a heart rate monitor. I just walked 30 minutes on the treadmill at various angle degrees from 5 to 10. It measured my heart rate and I was able to record that, but since it could not record elevation or distance is there a way I can take the information from the treadmill with the average heart rate from the Garmin device and calculate how many calories I burned?

The treadmill said 200 but it knows nothing about my heart rate.

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