What does it cost to level Leatherworking right now?

6.3kg in reagents at today's US auction prices, over about 84 crafts. Sell the results and it comes back to 6.3kg.

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 17:57 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 · Northrend Leatherworking · US · prices as of 17:57 UTC

Leatherworking leveling 1 → 75 · Northrend Leatherworking

6.3kg in reagents over about 84 crafts. Sell what you make and it comes back to 6.3kg.

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

Arctic Fur×5435

1,890

×541,890

Icy Dragonscale×13041

1,825

×13041,825

Heavy Borean Leather×4032

Crystallized Shadow×402

107

×40107

Total6,319

Step 1 · Skill 1 → 5

Yellow

Borean Armor Kit

About 6 crafts.107

per skill point26

Borean Leather×24

Step 2 · Skill 5 → 20

Orange→Yellow

Heavy Borean Leather

trainer

About 19 crafts.509

per skill point33

Borean Leather×114

Step 3 · Skill 20 → 40

Orange

Scaled Icewalkers

trainer

About 20 crafts.947

per skill point47

Icy Dragonscale×600

Crystallized Shadow×40

Step 4 · Skill 40 → 55

Orange→Yellow

Eaglebane Bracers

trainer

About 17 crafts.952

per skill point63

Icy Dragonscale×680

Step 5 · Skill 55 → 65

Orange→Yellow

Icescale Leg Armor

trainer

About 12 crafts.1,473

per skill point147

Arctic Fur×24

Icy Dragonscale×24

Frozen Orb×12

Step 6 · Skill 65 → 75

Orange

Belt of Arctic Life

needs the recipe item

About 10 crafts.2,330

per skill point233

Heavy Borean Leather×40

Arctic Fur×30

Skill 75 — done. Now sell what you made.

Crafted itemUnitsEachTotal

Heavy Borean Leather191

1925

Icescale Leg Armor122

1224

Borean Armor Kit675

Scaled Icewalkers2015

203

Eaglebane Bracers1715

172

Belt of Arctic Life1079

107

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

Back in your pocket6,259

What's worth crafting with Leatherworking right now

Questions

How this route is built

What does it cost to level Leatherworking right now?: 6.3kg in reagents at today's US auction prices, over about 84 crafts. Sell the results and it comes back to 6.3kg.
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 17:57 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.