How many calories are there in this nutritional drink called 'boost? manufactured by glaxosmithkline

Depends Which: http://www.boost.com/nutritional-drinks they range from 190 to 360 per drink.

Read the label: This information should be marked on the label on the back of the bottle, if you read it. Information i found online shows that each bottle of the "original" formula contains 240 calories. This could differ by specific product.

Read label: Many companies are global & manufacture products for specific country w/different serving sizes (ml vs ounce) & even ingredients. There are many different versions of boost. Check label on yours to get specific answer. Or search internet for your specific version. Look here to start: http://www.Boost.Com/nutritional-drinks (sorry but i couldn't find india's version).