Guild Wars 2

Just based on the three damage stats (you can further modify for boons like fury/might), assume all else equal (enemy toughness, weapons, traits, etc. but if you know what said traits modify you can add them in). Mostly used to determine tradeoffs from tweaking your gear.

Long Run Direct Damage = P * (1 + C * (0.5 + D)

P = Power
C = crit rate (%)
D = crit damage (%)

Plug in current stats to get X1, C and D as % (e.g. 40% = 0.40).
Plug in what you are thinking of modifying (e.g. more/less D, more/less C, more/less P) to get X2.

Compare X1 to X2, whichever is higher will do more damage for you in the long run.

The percentage difference will tell you much extra time it will take for you to kill something with direct damage. You can test this on golems in the mist, 10% difference in long term damage means 10% more time for the smaller number to kill something.

Learn it. Use it. Love it.

Forgot weapon dmg…. this just takes stats into account.