What does it cost to level Engineering right now?

12.2kg in reagents at today's KR auction prices, over about 104 crafts. Sell the results and it comes back to 12.2kg.

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 17:26 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 · KR · prices as of 17:26 UTC

Engineering leveling 1 → 75 · Pandaria Engineering

12.2kg in reagents over about 104 crafts. Sell what you make and it comes back to 12.2kg.

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

Total12,215

Step 1 · Skill 1 → 25

Orange

Goblin Glider

trainer

About 24 crafts.215

per skill point8

Tinker's Kit×24

Step 2 · Skill 25 → 35

Green

Flashing Tinker's Gear

trainer

About 40 crafts.2,000

per skill point200

Ghost Iron Bar×80

Step 3 · Skill 35 → 75

Orange

Jard's Peculiar Energy Source

needs the recipe item

About 40 crafts.10,000

per skill point250

Ghost Iron Bar×400

Skill 75 — done. Now sell what you made.

Crafted itemUnitsEachTotal

Flashing Tinker's Gear401

4040

Jard's Peculiar Energy Source405

402

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

Back in your pocket12,173

What's worth crafting with Engineering right now

Questions

How this route is built

What does it cost to level Engineering right now?: 12.2kg in reagents at today's KR auction prices, over about 104 crafts. Sell the results and it comes back to 12.2kg.
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 17:26 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.