What does it cost to level Engineering right now?

14.4kg in reagents at today's TW auction prices, over about 144 crafts. Sell the results and it comes back to 14.4kg.

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 18:54 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 · TW · prices as of 18:54 UTC

Engineering leveling 1 → 75 · Pandaria Engineering

14.4kg in reagents over about 144 crafts. Sell what you make and it comes back to 14.4kg.

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 Bar×48029

14,395

×48014,395

High-Explosive Gunpowder×6447

×6430

Total14,425

Step 1 · Skill 1 → 25

Yellow→Green

Serpent's Heart Firework

needs the recipe item

About 64 crafts.30

per skill point1

High-Explosive Gunpowder×64

Step 2 · Skill 25 → 35

Green

Flashing Tinker's Gear

trainer

About 40 crafts.2,399

per skill point239

Ghost Iron Bar×80

Step 3 · Skill 35 → 75

Orange

Jard's Peculiar Energy Source

needs the recipe item

About 40 crafts.11,996

per skill point299

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

Serpent's Heart Firework3205

32016

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

Back in your pocket14,383

What's worth crafting with Engineering right now

Questions

How this route is built

What does it cost to level Engineering right now?: 14.4kg in reagents at today's TW auction prices, over about 144 crafts. Sell the results and it comes back to 14.4kg.
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 18:54 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.