Synonym of reckon on

(historical) A printed book or table containing precalculated values, often multiples of given amounts. / A computer program which calculates values; an online calculator.

simple past tense and past participle of reckon upon

present participle of reckon upon

plural of ready reckoner

(religion) The final and eternal judgment by God of all nations; Final Judgment. / (by extension) Any time or event at which responsibility will be assigned.

(UK, slang) An expression of disbelief or doubt at what one has just heard.

plural of day of reckoning

plural of dead reckoning

present participle of reckon without