Runescape combat level question?

these are my combat stats:83 attack, 75 strength, 74 defense, 78 ranging, 54 prayer, 65 magic, and 4 summoning. my combat level is currently 97 and i want to be 99 attack and still be below 100 cb. I've used a skill calculator but i have no idea what my hp level will be once i reach 99 attack. is it possible for me to have 99 attack and still be below cb level 100?