WordWeb Online

1. Not able to be computed or enumerated
   "What I owe to them all is incalculable"
    
2. Too much to be measured
   "incalculable riches";
   - untold

See also: beaucoup [US, dialect, informal], countless, immeasurable, incomputable, indeterminable, inestimable, infinite, innumerable, innumerous, much, mucho [informal], multitudinous, myriad, numberless, uncounted, undeterminable, unnumberable, unnumbered, unnumerable

Antonym: calculable