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

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