Calories burned calculations— using avg heart rate

Zombierawr

So I have a heart rate monitor I use to find my average heart rate during exercise. Then I use to equation found on livestrong's website—

Calories Burned = [(0.4472HR+ 0.1263W + 0.074A - 20.4022) / 4.184] * T

Which normally gives me a relatively reliable amount of calories burned. But today it told me I burned nearly 2000 calories playing tennis this morning for 2 hours, and it just doesn't seem right!

Does anyone know what equation is most reliable? I mean, MFP says I only burned 800ish calories. More than anything, I jus don't want to go into starvation mode by not eating enough.

And my HRM says I only burned 55 calories, so don't tell me to go by that haha.

13pointUNO

Let someone else do the work:

http://www.shapesense.com/fitness-exercise/calculators/heart-rate-based-calorie-burn-calculator.aspx

MoreBean13

What's your VO2max? Try this calculator:
http://www.easycalculation.com/health/heart-rate-calorie-burn-known-vo2.php

It's extremely unlikely that you burned 2000 calories in 2 hrs. And you won't go in to starvation mode in one day, it is a long term thing based on chronic undereating. I would use the 800 cal estimate, personally. I'd rather undershoot than eat an extra 1200 calories in a day.

Jynus

Let someone else do the work:

http://www.shapesense.com/fitness-exercise/calculators/heart-rate-based-calorie-burn-calculator.aspx

Thats about 100% too high according to the metabolic chamber data I have.o.O