Engineering leveling route 1–300

How this route is computed

1. Skill-up chance: orange = 100%; yellow and green = (gray − skill) ÷ (gray − yellow); gray = 0. Expected crafts per point = 1 ÷ chance.
2. At every skill point we pick, among the recipes you can already learn that still give skill, the one with the lowest material cost per expected point (keeping the current recipe unless another is at least 10% cheaper).
3. Material cost uses the client’s vendor prices: exact for trade-supply items (thread, vials, dyes, flux…) and an estimate for gathered materials; items with no vendor price (dusts, essences…) take the median price of trade goods of the same item level. Enter your server prices to replace the estimates.
4. Materials your profession can make (bolts, cured hides, bars…) are crafted when that is cheaper than buying them, and anything made earlier in the route is reused.
5. Recipes with a cooldown (transmutes, Mooncloth) are never used; specialization recipes only when you pick that specialization; with “Prefer trainer recipes”, recipes learned from a recipe item count at triple cost.
6. Trainers are server data: for trainer recipes we estimate the required skill as yellow − 20 (the usual gap for this profession’s recipe items) and mark those steps.
7. Not in the material cost: trainer fees (shown apart, at Classic's prices: trainers are server data, so Forever's are in no file), the cost of recipe items and auction-house fluctuations. The level each rank asks for is Forever's when its files give one, else Classic's.

Orange Yellow Green GrayBar: orange (always gives a point) → yellow → green → gray (no more points).