reck·on 
(rĕkən)
(rĕkən)v. reck·oned, reck·on·ing, reck·ons
v.tr.
1. To count or compute: reckon the cost. See Synonyms at calculate.
2. To consider as being; regard as: a book that was reckoned a masterpiece. See Synonyms at consider.
3. Chiefly Southern & South Midland
a. To think or conclude: I reckon what you say is true.
b. To expect or intend (to do something): "You reckon to call the sheriff?" (Cormac McCarthy).
v.intr.
Phrasal Verbs: 1. To make a calculation; figure.
2. Chiefly South & South Midland To think or believe: I reckon so.
reckon on Chiefly Southern & South Midland
To expect or anticipate: When do you reckon on coming back?
reckon with
To take into account or deal with: a man to be reckoned with.
reckon without
To fail to consider or deal with; ignore.
[Middle English rekenen, from Old English gerecenian, to recount, arrange; see reg- in the Appendix of Indo-European roots.]