Prayer potion decanting profit

Bob Barter at the Grand Exchange decants Prayer potion between dose sizes for free, so the price per dose of each size is what matters. Buying one dose costs (1) 2,434 gp, (2) 2,510 gp, (3) 2,383 gp, (4) 2,491 gp. The best direction now is to buy the (3) and sell the (2), keeping +94,667 gp per 1,000 doses after the 2% GE tax. 1,654,857 potions of all sizes traded in the last 24 hours.

Data age: the oldest price used here is from a trade 10m ago. Prices refresh every minute.

Best direction now

Buy (3), decant at Bob Barter, sell (2): +94,667 gp per 1,000 doses after tax.

Per dose: pay 2,383 gp, keep 2,478 gp after tax. 1,000 doses is 334 (3) potions in and about 500 (2) potions out.

Cost per dose by size

Potion	Buy now	Cost / dose	Sell now	Kept / dose	Vol / 24h	Buy limit
Prayer potion(1)	2,434	2,434	2,340	2,294	5,446	2,000
Prayer potion(2)	5,019	2,510	5,057	2,478	4,897	2,000
Prayer potion(3)	7,150	2,383	7,055	2,305	300,739	2,000
Prayer potion(4)	9,963	2,491	9,880	2,421	1,343,775	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)	(2)	+94,667
(1)	(2)	+44,000
(3)	(4)	+37,417
(4)	(2)	-12,750
(1)	(4)	-13,250
(2)	(4)	-88,750

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.