To get a more accurate calculation, follow the steps below

• Remove all buff, even personal buffs
• Record down current stats(1) like EXP, HP, MP etc
• Remove all gears, including Pets, Jewels, Styles
• Record down Raw Stats(2), like EXP, HP, MP etc
• Take Current stat(1) and minus Raw Stats(2)
• Use the difference for the conversion

The reason for using the method above is because equipment optimized by a Rebirth Flame will scale its stats based on the current stats of a targeted item. Meaning they only take stats which includes the following:

• Equipment & Equipment Set Options (including pets)
• Soul & Soul Set Options
• Jewel & Jewel Set Options
• Style & Style Set Options
• Potential Options

For possible max % of each Rebirth Rank. Click here to visit astralmist's MSM info sheet