High Alchemy Calculator

Understanding High Alchemy Profit

High Level Alchemy converts items into gold coins at their "high alch value" — a fixed number equal to 60% of the item's store sell price. The profit formula is simple: Alch Value minus Buy Price minus Nature Rune Cost. If the result is positive, you profit on every cast. Nature runes are the primary ongoing cost, so tracking their price is critical.

The limiting factor is buy limits. Even if an item has incredible profit per cast, you can only buy so many per 4 hours on the Grand Exchange. The Profit/Hour column above factors this in: it calculates how many of that item you can actually alch per hour given the buy limit. An item with 500GP profit but a buy limit of 100 gives you only 100 alchs per 4 hours (25/hr), or 12,500 GP/hr. Compare that to an item with 50GP profit but a 10,000 buy limit — that is 2,500 alchs per hour at 125,000 GP/hr.

Always consider both profit per cast and sustainable hourly throughput. The best strategy is to diversify across multiple profitable items so you never run out of things to alch. Set buy offers for 3-5 different items, alch through them, and restock. Read the high alch item guide and high alch profit guide for in-depth strategies.