Wiktionary
reckon on
vb. 1 To count on or depend on. 2 To plan on; to expect.
Usage examples of "reckon on".
We can reckon on having prodgies around the place at least one night a week.
Percival reckons there's plenty of big reservoirs on the island but he doesn't reckon on two things.
Only what I didn't reckon on was that full details of the affair would be carefully recorded in some great computer file where it would lie sleeping for all these years till Prince Charming here came along and woke it with a kiss!