Prayer bonus: 0.33333% per prayer point (notice the percentage). A bonus of +46 (the maximum from equipment) can slow the drain rate by 1.5. For example: Steel Skin drains 1 prayer every 3 sec, with +1 prayer bonus from mace, you instead lose 1 prayer every 5 sec. Str bonus: it is a bit more complicated with calculation: Formula: Max Hit = Floor[(your Strength level * (1 + other strength bonus, including those from prayer and pot) + Combat Style Bonus) * ((Equipment Strength Bonus * 0.00175) + 0.1) + 1.05] Note: Floor means to round down the decimals to the nearest whole value; When calculating Prayer bonus, divide that % by 100; Combat Style Bonus: +3 for Aggressive and +1 for Controlled Defence and Attack bonus: A * [(your current Attack level * attack type bonus) / (your current Defence level * defence type bonus)] Note: attack/defence type bonus refers to Stab, Crush, Slash, Magic, and Ranged. The constant A is currently undetermined, but proven to be less than 1