do objects contain calories too?
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Well, yes and no.
The calorie is a unit of measurement for energy, like the meter is a unit of length. A calorie is defined by the energy needed to heat up a kilogram of water by one degree Celsius. You could totally convert it to other units of energy, like the kilowatt-hour (the unit in which your electric bill is measured) : one kilowatt-hour is equal to around 860 calories.
Saying that there are 1000 calories in a meal mean that, if you eat that meal, your body could theoretically extract 1000 calories of energy from it, and use that energy to heat itself, move your muscles, or thinking about things.
So are there calories in, say, a table ? Well, in a sense, no, because you cannot eat a table (no, don’t try), so there is no energy in it that you can use.
But there definitely is some energy inside a table. Your body may not be able to use it, but machines could. For example, put that table in a wood-burner and it will extract energy from it (by burning it), and heat up your house.
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