Hill giants in AD&D 1: 2d8 dmg, a THACO of 12, AC 4. However, remember that AD&D 1 10th level fighters only had Max 9d10 +0 to 40 more hit points, with an average of about 63 hp, and an AC between 2 to -2, unless the DM was giving out lots of magic armor. This means that the Giants are hitting about 30% to 50% of the time, and slicing off about 10 points per slice.
OK.
AD&D1 hill giants translated to D&D3:
AC 16, Attack +8, Damage 2d8 [~10]
AD&D1 fighter translated to D&D3:
AC 20, hit points 71 (9 x5.5, +18 [+2 con bonus], +4 [10th level])
[Edit: fixed miscalc on hit points]
Hill giant hits fighter 40% of the time (1 try per round), doing 10 damage each hit (or 4 points per round figuring the average hit chance in), needing 18 rounds to kill the AD&D1 fighter.
D&D3 hill giants:
AC 20, Attack +16/+11, Damage 2d8+10 [~20]
D&D3 10th-level fighter:
AC 20, hit points 79 (10, + 9x5.5, +20 [+2 con bonus])
Hill giant hits fighter 80%/55% of the time, doing 20 damage each hit (or 27 [16 +11] per round figuring the average hit chance in), needing 3 rounds to kill the D&D3 fighter.
Is my math right?
Quasqueton