You can value something at its current market value, if the asset is one that has such a thing. And fair market value will generally correspond to what you would estimate to be net present value, plus whatever risk premiums and holding costs and so on that the market is accounting for.
According to Merrian-Webster [1]:
calculate: 1 b: to reckon by exercise of practical judgment : ESTIMATE
But sure, let me clarify it to: you can’t calculate a precise NPV.
You can only estimate one.
Which, when we are trying to do things like ‘calculate the total assets a bank has’, makes the net present value of their assets a not very reliable number to use.
I wasn't taking a math test. I was saying something about NPV using a common meaning of an English word. You chose to ascribe a different meaning to that word, and pedantically - and incorrectly - tried to correct me.