Ancient brew decanting profit

Bob Barter at the Grand Exchange decants Ancient brew between dose sizes for free, so the price per dose of each size is what matters. Buying one dose costs (1) 588 gp, (2) 513 gp, (3) 386 gp, (4) 505 gp. The best direction now is to buy the (3) and sell the (1), keeping +128,667 gp per 1,000 doses after the 2% GE tax. 90,924 potions of all sizes traded in the last 24 hours.

Data age: the oldest price used here is from a trade 6h ago. Prices refresh every minute.

Best direction now

Buy (3), decant at Bob Barter, sell (1): +128,667 gp per 1,000 doses after tax.

Per dose: pay 386 gp, keep 515 gp after tax. 1,000 doses is 334 (3) potions in and about 1,000 (1) potions out.

Cost per dose by size

Potion	Buy now	Cost / dose	Sell now	Kept / dose	Vol / 24h	Buy limit
Ancient brew(1)	588	588	525	515	61	2,000
Ancient brew(2)	1,025	513	1,022	501	220	2,000
Ancient brew(3)	1,159	386	1,175	384	18,776	2,000
Ancient brew(4)	2,019	505	1,902	466	71,867	2,000

Cost per dose is the instant-buy price divided by the doses. Kept per dose is the instant-sell price minus the 2% GE tax, divided by the doses. Per-dose figures are rounded to the gp; profits use the unrounded values.

Every direction, per 1,000 doses

Buy	Sell	Profit / 1,000 doses
(3)	(1)	+128,667
(3)	(2)	+114,667
(3)	(4)	+79,667
(4)	(1)	+10,250
(2)	(1)	+2,500
(4)	(2)	-3,750

Buy limits apply per dose size, so the source size's limit caps how many doses you can move every 4 hours.

Prices are instant execution on both sides, so patient offers usually do better than these numbers. See the decanting table for every profitable potion right now.