What does it cost to level Alchemy right now?

2.4kg in reagents at today's TW auction prices, over about 93 crafts. Sell the results and it comes back to 2.2kg.

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 17:54 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 · Northrend Alchemy · TW · prices as of 17:54 UTC

Alchemy leveling 1 → 75 · Northrend Alchemy

2.4kg in reagents over about 93 crafts. Sell what you make and it comes back to 2.2kg.

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

Crystallized Earth×824

Total2,371

Step 1 · Skill 1 → 40

Orange→Yellow

Mighty Arcane Protection Potion

needs the recipe item

About 41 crafts.450

per skill point11

Crystallized Earth×82

Crystal Vial×41

Step 2 · Skill 40 → 70

Orange→Green

Earthsiege Diamond

trainer

About 47 crafts.940

per skill point31

Dark Jade×47

Huge Citrine×47

Step 3 · Skill 70 → 75

Orange

Flask of Pure Mojo

trainer

About 5 crafts.980

per skill point196

Skill 75 — done. Now sell what you made.

Crafted itemUnitsEachTotal

Earthsiege Diamond473

141

47141

Mighty Arcane Protection Potion4150

4120

Flask of Pure Mojo1025

102

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

Back in your pocket2,207

What's worth crafting with Alchemy right now

Questions

How this route is built

What does it cost to level Alchemy right now?: 2.4kg in reagents at today's TW auction prices, over about 93 crafts. Sell the results and it comes back to 2.2kg.
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 17:54 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.