To think; to “guess”; to “reckon.”

1

bef. 1812.  Capital, gentlemen! capital! You are right humorsome, I calculate. What’s to pay?—John Bernard, ‘Retrospections of America,’ p. 307 (N.Y., 1887).

2

1850, 1857, &c.  N.E.D.

3

1851.  I kalkilated them curs o’ hisn wasn’t worth shucks in a bar fight.—‘Polly Peablossom’s Wedding,’ &c., p. 51.

4

1852.  The New Englander calculates, the Westerner reckons.—Yale Lit. Mag., xvii. 177 (March).

5

1867.  

        ‘Wal, Square, I guess so. Callilate to stay?
I ’ll ask Mis’ Weeks; ’bout thet it ’s hern to say.’
Lowell, ‘Fitz-Adam’s Story.’    

6

1869.  Kalklate to quit the business [of stage-driving] next trip. I’m getting well on in years, you see, and don’t like it so well as I used to, afore I was busted in!—J. Ross Browne, ‘Adventures in the Apache Country,’ p. 313.

7