Inaccurate calorie count

[KPhukan]

Hi, I have some concerns regarding the calorie count given by my Versa watch. I had no intense activity today except 1hour of workout session. And my watch says I burned around 1500 cals which is very strange for a lazy day. I know there is a +/- of around 27% but this figure of 1500 is way too up. Any idea why that might be the case? Am I missing on anything?

[JohnnyRow]

Are you considering BMR (basal metabolic rate) calories, the calories you are always burning just by being alive.  These often make up more than half your daily calorie burn.  Fitbit always credits these, even when you are not wearing the tracker.

From How does my Fitbit device calculate my daily activity? 

How does my Fitbit device calculate calories burned?

Fitbit devices combine your basal metabolic rate (BMR)—the rate at which you burn calories at rest to maintain vital body functions (including breathing, blood circulation, and heartbeat)—and your activity data to estimate your calories burned. If your device tracks heart rate, your heart-rate data is also included, especially to estimate calories burned during exercise. The number you see on your Fitbit device is your total calories burned for the day.

Your BMR is based on the physical data you entered in to your Fitbit account (height, weight, sex, and age) and accounts for at least half the calories you burn in a day. Because your body burns calories even if you’re asleep or not moving, you see calories burned on your device when you wake up and will notice this number increase throughout the day.