standing

i was just wondering if standing on my feet for my job at a department store really burns a lot of calories? I stand to do the cashier work ...i had a 1/2 hour break in 9 hours. So for the remainder of the time i was standing. I typed into fitday.com standing/lifting/unpacking light moderate effort for 6 hours and it told me about 865 calories! can this be correct?
 
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