Edit: Should have visited the Battlestar Wiki - would have made things easier...
Galactica vital stats: 24 twin-turrets (according to the wiki) - I've managed to break it down into: 8 each on the top and bottom (I give them 4x each of AC, BD, CE, DF arcs), 4 at the very front of the nose (G, AB, or 2x A & 2x B arcs), and then on a lucky image I found the other 4 turrets, 2 each on the sides of the front (I'd say 2x AH and 2x BI because the flight pods get in the way). 514 (?!) Anti-fighter batteries. Approx. 80 vipers, 'numerous' Raptors.
Pegasus vital stats: 34 twin turrets (according to the wiki) - 2x front, 2x back, and 3x outside edge of each of the flight pods (2x AC, 2x BD, 2x CE, 2x DF, 3x C (or HJ), 3x D (or IK)), 6 along each of the edges of the front nose (6x AC, 6x BD), and 8 in the front of the nose - 4 turreted (2x A & 2x B, or 4x AB) and 4 fixed forward (4x G). 50 Raptors, 200 Vipers. Unknown amount of anti-fighter batteries.
Information taken from the following sources:
http://en.battlestarwiki.org
http://www.shipschematics.net/bsg/images/colonial/battlestar_galactica.jpg
http://www.shipschematics.net/bsg/images/colonial/battlestar_mercury.jpg