extrapolate
verb [ I or T ]
/ɪkˈstræpəleɪt/ ukusto use existing information to discover what is likely to happen or be true in the future:
Speaking about global warming, she said that time periods of 15 and even 30 years are too brief to extrapolate changes in climate patterns.
extrapolate (sth) from sth We as economists tend to just predict the future by extrapolating from the past.
extrapolate trends/patterns/risks
extrapolate figures/data/numbers