July 28, 2026 · 7 min read
A gp/hr figure looks like a fact. It's actually the output of several assumptions stacked together, and most published numbers get at least one of them wrong — not through dishonesty, usually just because it's tedious to get all of them right and nobody checks.
The simplest version of a flip calculator takes today's margin and multiplies it by however many units you could theoretically buy in an hour. That number is fiction the moment an item has a buy limit or thin trade volume — you can't actually buy 10,000 units of something with a 4-hour limit of 100, and you can't sell into a market that only trades 40 units a day without moving the price against yourself.
A sustainable gp/hr figure has to account for the buy limit and the real trade volume, which usually means the honest number is meaningfully lower than the naive one — and that's fine. A lower, real number is more useful than a bigger, fictional one.
"380 logs/hr" means nothing on its own — is that at the level where the method unlocks, or at 99 with best-in-slot gear? A rate that needs a dragon axe is a completely different number from the same method with a rune axe, and F2P can't use a dragon axe at all. A lot of guides quote the best-case rate and let the requirement stay vague, which quietly overstates the number for most of the people reading it.
The honest fix is boring: state the exact assumption a rate is built on, right next to the rate.
A monster's drop rate — 1 in 512, say — is a fact about the game itself, not something that changes with the market. But the gp value of that drop absolutely does change, hourly. The two need to stay visibly separate: this is what the game guarantees (the rate), this is what today's market says it's worth (the price). Blend them into one silent number and you can't tell which part is stale.
Read the full methodology for this site →
What counts as live-priced vs a labelled estimate, and why
Every gp figure on this site is computed at the moment you load the page, from the same real-time price API the Grand Exchange itself is read from — not a number someone typed in once. Where a rate is a recalled fact rather than a live price (a drop chance, a kills-per-hour estimate), it's labelled as exactly that, with the assumption it's built on stated next to it.
See it in practice — every gp/hr figure, live →