Synonyms for Reckon up:

• v.

  •add (verb)
  • count up,
  • sum,
  • count,
  • calculate,
  • do addition,
  • tote,
  • cast,
  • tot up,
  • total,
  • enumerate,
  • tally,
  • compute,
  • tot,
  • figure,
  • summate.
  •simple arithmetical process of increase; accumulation (verb)
  • add.
  •tot (verb)
  • foot.

• Other synonyms:

  •add
  • Summing,
  • Summed,
  • summates,
  • counting up,
  • Tallied,
  • totting up,
  • summating,
  • totalize,
  • summated,
  • counted up.
  •tot
  • footed.

Antonyms for Reckon up:

• v.

  • add
    estimate, diminish, subtract, remove, deduct, withdraw, guess, decrease, lessen, reduce.