人算不如天算

man proposes, God disposes (idiom) / one's plans can be derailed by unforeseen events

person; people / CL:個|个[ge4],位[wei4]

to regard as / to figure / to calculate / to compute

no; not so / (bound form) not; un-

not equal to / not as good as / inferior to / it would be better to

as / as if / such as

day / sky / heaven