OSRS Drop Calculator › Perfect shell

Best way to farm Perfect shell

All 2 monsters that drop Perfect shell, ranked by realistic quantity per hour — not just drop rate. Change the seconds-per-kill for any monster to match your own speed. 1 other source isn’t ranked; see why below.

Drop data: Perfect shell on the OSRS Wiki

Currently fastest method
Warped Tortoise
5.2 / hr
Monster Drops (rarity · quantity) Avg/kill Sec/kill Kills/hr Qty/hr
Warped Tortoise
Combat lvl 121 · Slayer 56
2/64 · 1–3
 0.062 43 84 5.2
Tortoise (With riders)
Combat lvl 92
2/128 · 1–3
 0.031 29 124 3.9

Other sources (not ranked)

Mutated Tortoise is a superior slayer monster: it only appears randomly (~1 in 200 kills) while you’re on a slayer task. So it’s not included in the ranking above.

Monster Drops (rarity · quantity) Avg/kill
Mutated Tortoise
Combat lvl 247 · Slayer 56
2/64 · 1–3 (3 rolls)
 0.188
How this is calculated: items/hr = (3600 ÷ seconds per kill) × average items per kill. Each monster's drop lines are listed as the wiki shows them (rarity · quantity); the average adds them all up, each as rarity × average quantity × rolls — so a guaranteed drop plus a rarer bonus drop both count. Drop rates and quantities come from the OSRS Wiki's community-verified drop tables. Seconds-per-kill is an editable estimate based on each monster's hitpoints and defence — your real speed depends on your stats and gear, so adjust it and your edits are remembered on this device. Rates marked ~ are approximate on the wiki.