Burning calories on an elliptical trainer?

I've got this question I'm a female. 13 years old (soon 14). I weigh 135 pounds. I'm 5'2. I just used my elliptical trainer for exactly 20 minutes and it says that i burnt 274 calories and 87.2 fat calories. I was going at a normal speed. -Not slow-Not fast- and the resistance was on number 2 from 0 to 150 calories and resistance on 3 from 150 to 200 and then back on 2 from 200 to 274. So do you think that this is right? Do you think i really brunt 274 calories...? Do you think i burnt more or less? Thankyou. :) (P.S. I don't have a bigbig fancy elliptical, it's just a 300$ one called Weslo monument 620.)

And I found this way Unlikely you burned that many calories in only 20 minutes, but possible. FWIW, calorie displays on exercise machines are not accurate. There is no way to measure calories you burned without hooking you up to a lot of tubes, hoses, electrodes and a lot of very expensive equipment. Exercise equipment manufacturers put in a SWAG (Silly Wild *** Guess) by estimating human digestive and mechanical efficiency times horsepower required to drive the footpads. There are an awful lot of error margins and individual variation in between your mouth (where the food/fuel/calories go in) and the footpads, where you push the horsepower. Calorie displays are no more than a marketing gimmick. Judge your workout by speed, heart rate, distance, and elapsed time. Did you do better than last time? Go farther? Then its a success.

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