to estimate; to assess; to calculate · (coll.) to reckon; to think (that...)

It is estimated that only a few hundred pandas remain, with a small number of them being raised in zoos in China and abroad.

How much time do you estimate it'll take you to do that?

Last time I counted, I estimated that I know around 2500 Chinese characters.

We calculated that we could reach the place within two weeks.

I don't think that I'll be able to get there on time.