What does it cost to level Engineering right now?

5.5kg in reagents at today's US auction prices, over about 79 crafts. Sell the results and it comes back to 5.4kg.

Where do these numbers come from?

The skill thresholds are read from the game client data for build 12.1.0.68914. The prices are the region-wide auction house, refreshed every few minutes; these are the snapshot taken at 16:57 UTC.

Why does the route change when I reload?

Because the prices did. The cheapest recipe for a stretch of skill is whichever one's reagents are cheapest at that moment, and that moves through the day.

Profession leveling · Pandaria Engineering · US · prices as of 16:57 UTC

Engineering leveling 1 → 75 · Pandaria Engineering

5.5kg in reagents over about 79 crafts. Sell what you make and it comes back to 5.4kg.

Start skill

Trainer recipes only

Recipe names carry the colour the profession window gives them: orange is a point every craft, yellow is three in four, green is one in four.

Before the first craft — buy it all at once

One trip to the auction house. Vendor lines are cheaper from the profession vendor than from the board.

ReagentNeedEachTotal

Ghost Iron Bolts×10423

High-Explosive Gunpowder×6412

Total5,453

Step 1 · Skill 1 → 25

Orange

Goblin Glider

trainer

About 24 crafts.95

per skill point3

Tinker's Kit×24

Step 2 · Skill 25 → 55

Orange→Yellow

Tinker's Kit

trainer

About 32 crafts.2,305

per skill point76

Ghost Iron Bolts×64

Windwool Cloth×64

High-Explosive Gunpowder×64

Step 3 · Skill 55 → 62

Yellow

Mirror Scope

trainer

About 10 crafts.1,005

per skill point143

Ghost Iron Bolts×40

Lapis Lazuli×20

Step 4 · Skill 62 → 75

Orange

Jard's Peculiar Energy Source

needs the recipe item

About 13 crafts.2,047

per skill point157

Ghost Iron Bar×130

Skill 75 — done. Now sell what you made.

Crafted itemUnitsEachTotal

Jard's Peculiar Energy Source135

1365

Capped at what the market takes in 3 days, so a route never pretends to sell hundreds at once.

Back in your pocket5,425

What's worth crafting with Engineering right now

Questions

How this route is built

What does it cost to level Engineering right now?: 5.5kg in reagents at today's US auction prices, over about 79 crafts. Sell the results and it comes back to 5.4kg.
Where do these numbers come from?: The skill thresholds are read from the game client data for build 12.1.0.68914. The prices are the region-wide auction house, refreshed every few minutes; these are the snapshot taken at 16:57 UTC.
Why does the route change when I reload?: Because the prices did. The cheapest recipe for a stretch of skill is whichever one's reagents are cheapest at that moment, and that moves through the day.

A first craft pays Knowledge, not skill, so it is shown as a badge and left out of the craft count. Vendor reagents are priced at the lower of the vendor and the auction house.