Sure, just give me the number of zombies per level, the hit‑point average of each, and the ammo cost of your weapons. Then I’ll crunch the math: bullets per zombie = (average zombie HP / bullet damage) × (miss rate factor). In practice, you’ll want a 2:1 or 3:1 ratio if you’re a fan of the “shoot‑and‑regret” style, but if you’re into efficiency, 1.5:1 keeps you alive until the next patch. Remember, hoarding spare ammo never hurts.