Are you talking point-build or increasing characteristics?
Personally, I tend to use random characteristics that can be slightly adjusted afterwards. That way, you can have very different characteristics but then use the same point spend on skills and characteristic increases.
If you are using point-build for characteristics it should be a bit different.
What I would do is to take the standard Legend point build and divide by the number of D6s (or 6s) used for random rolls. Multiply that by the number of D6s (or 6s) used in the different race and round up to the next 10.
So, humans have 3D6 in each stat, with INT and SIZ as 2D6+6, or 21 D6s/6s. The standard points build for humans is 80. Dwarves add up to 21, so they have the same points-spend as humans. Legend Trolls (As in Monsters of Legend) have 24 D6s/6s, so (80 / 21) * 24 = 91, round up to 100, so Trolls get 100 points to spend on characteristics. Elves have 22, so they get (80 / 21) * 22 = 83, rounds up to 90, so Elves get 90 points to spend. Goblins get 15, so (80 / 21) * 15 = 57, rounding up to 60.
It's not exact, but is quite simple to work out.