I figure that most people have yet found out how to calculate there CP so here is how I do it.

First know that there is the equation by hand

C = x + 0.5y + h + 0.5m + 0.5q + f + 0.2n + 0.1d + 0.5w + 0.1u

with

• C=Combat Power
• x=highest cp giving skill
• y=second highest cp giving skill
• h=Base Health
• m=Base Mana
• q=Base Stamina
• f=Base Strength
• n=Base Intelligence
• d=Base Dexterity
• w=Base Will
• u=Base Luck

This information can be found on mabi wiki Combat Power page.

The equation above is based on the base stats (the white stats), not the yellow highlighted. The diffacualty is knowing your CP highest and second highest skill labled as x and y in the equation.

First to find these you should go to the combat power page on wiki. 

Second go to the Skill "CP table." this should be the first table you see.

Third, click the box next to the rank 1 column with 2 triangles inside it 2x. This will make the list of highest to lowwest skill CP skills.

Lastly, find the 2 skills that you have that is closest to the top and enter there cp into the calculator. The CP of that skill will be the number that it corresponds to in the column.

If you don't want to maualy do this you can always use the CP generator here. Just imput your base stats and the rank of your highest and second highest cp skills found in Skill CP table. 

Below has the list of r1 highest to lowest skills with out there CP if you have problems. This will make the generator  faster to set up.

Thunder, Fireball, Blaze, Hailstorm.

Shock.

Final Hit, Wind Guard, Arrow Revolver.

Heat Buster, Frozen Blast.

Final shot, Defence, Windmill, Charge, Taunt.

Flame Burst, Water Cannion, Life Drain.

Support Shot, Magmum Suot, Mirage Missile.

Lightning bolt.

Combat Mastery, Smash, Ranged Attack, Evation.

Fire Bolt, Magic Mastery.

Throwing Attack, Assult Slash.

Magic Masteries.

Sand Burst, Wind Blast.

Stomp, Melee Masteries, Critical Hit.

Ice bolt, Ice Spear.

Alchemy Mastery.

Production Mastery.

Counterattack.

Healing, Party Healing.

Barrier Spikes.

Meditation.

First Aid.

Rest.

Note some of these are yet to exist to caping. After the highest 2 CP skills the others don't count towards your CP unless by stats. These will be already shown as part of your base stats. For that reason, aging and leveling already is acounted also.