OSRS Moons of Peril Calculator
What a Lunar Chest is worth for the Moons you kill, every unique with duplicate protection, the chests to each Moon set, supplies and the repair cost of Moon armour.
What a chest gives
| Reward | Each roll | Chance | A chest | Value |
|---|
Which Moons to kill
| Moons | A unique | A chest | Chests an hour | An hour | Chests to your pieces |
|---|
Your Moon sets
Tick the pieces you already have. A Moon only gives a piece of its own set, and never one you have until the set is done.
| Piece | Price | Chance a chest |
|---|---|---|
| Blood Moon | ||
| — | — | |
| — | — | |
| — | — | |
| — | — | |
| Blue Moon | ||
| — | — | |
| — | — | |
| — | — | |
| — | — | |
| Eclipse Moon | ||
| — | — | |
| — | — | |
| — | — | |
| — | — | |
Chests to finish
| Chests | Chance done | Time |
|---|
Supplies at your levels
Everything is made inside Neypotzli from the supply crates and the caverns, so it costs nothing, and it all turns to dust when you leave.
| Supply | Gives | Needs |
|---|
Repairing Moon armour
The helm, chestplate and tassets wear down in combat; the weapons never do. Type the charges each piece has left (0 when broken) for the cost at an NPC such as Bob in Lumbridge, or yourself at an armour stand in your house.
| Piece | NPC | Armour stand | Saved | Buy new instead |
|---|
Sacrificing a piece to Eyatlalli
| Piece | Sells for | Sacrifice returns | Better to |
|---|
How lucky you have been
Chances are exact. Each Moon you defeat gives its own 1 in 56 roll at a piece of its set, never one you already have until that set is done. Only a chest with no unique rolls the standard table: once for one Moon, 3 times for two and 6 times for three. Values are today's Grand Exchange instant-sell prices after the 2% tax; anything bought is at instant-buy. Blessed bone shards and sun-kissed bones cannot be traded and are counted as Prayer experience. Figures marked with a ~ are estimates. Checked against the OSRS Wiki on 26 October 2026.
How the Lunar Chest rolls
Each Moon of Peril you defeat before opening the chest gives a 1 in 56 chance at a piece of that Moon's own set: the Blood Moon gives the dual macuahuitl and Blood Moon armour, the Blue Moon the Blue Moon spear and armour, and the Eclipse Moon the Eclipse atlatl and armour. The three rolls are separate, so one chest can hold pieces from two or three Moons, and there is no extra roll for killing all three. With all three a chest has a unique 1 time in 19, and each of the twelve pieces is 1 in 224.
| Moons | A unique | Each piece | Standard rolls | Standard loot |
|---|---|---|---|---|
| 1 | 1/56 | 1/224 | 1 | 98.21% |
| 2 | 1/28.25 | 1/224 | 3 | 96.46% |
| 3 | 1/19 | 1/224 | 6 | 94.74% |
Duplicate protection
A Moon never gives a piece of its set that you already have until you own all four, so a whole set takes exactly four successful rolls: 224 chests on average with that Moon killed, and any one piece you lack 140. The sunfire armour on the Colosseum calculator works the same way. The table is how many chests it takes with all three Moons killed each time and nothing owned.
| Chance | One piece | One set | Every piece |
|---|---|---|---|
| 1% | 3 | 48 | 134 |
| 10% | 23 | 99 | 196 |
| 25% | 57 | 143 | 243 |
| 50% | 117 | 206 | 305 |
| 75% | 198 | 286 | 381 |
| 90% | 287 | 373 | 463 |
| 99% | 476 | 559 | 641 |
The standard table
When no Moon gives a unique, the chest rolls this table instead: once with one Moon defeated, 3 times with two and 6 times with three. Atlatl darts come whichever Moons you killed. The last column is the average with all three.
| Reward | Each roll | Chance a roll | A chest of three |
|---|---|---|---|
| Atlatl dart | 72–120 | 5/30 | 90.9 |
| Blessed bone shards | 160–179 | 2/30 | 64.2 |
| Wyrmling bones (noted) | 42–54 | 1/30 | 9.09 |
| Sun-kissed bones (noted) | 6–12 | 3/30 | 5.12 |
| Swamp tar | 79–119 | 4/30 | 75.0 |
| Water orb (noted) | 30–45 | 2/30 | 14.2 |
| Supercompost (noted) | 6–12 | 3/30 | 5.12 |
| Soft clay (noted) | 15–25 | 3/30 | 11.4 |
| Grimy harralander (noted) | 12–18 | 3/30 | 8.53 |
| Grimy irit leaf (noted) | 12–18 | 1/30 | 2.84 |
| Maple seed | 1–2 | 2/30 | 0.57 |
| Yew seed | 1 | 1/30 | 0.19 |
Blessed bone shards are worth 5 Prayer experience each at the libation bowl with blessed wine, or 6 with blessed sunfire wine, and a jug does 400 shards. A sun-kissed bone breaks into 45 shards with a chisel, and a wyrmling bone into 21 once blessed.
Repairs
Moon armour has 3,000 charges and loses one as a fight starts and one every 54 seconds in combat, so a piece lasts 45 hours of fighting. An NPC charges 500 coins for each charge used, 1,500,000 for a broken piece. An armour stand in your house takes 1% off for every 2 Smithing levels, boosts included, so about half at 99. Bob in Lumbridge, Tindel Marchant in Port Khazard, Dunstan in Burthorpe, the squire at the Void Knights' Outpost and Aneirin in Prifddinas all repair it. Barrows equipment follows the same armour stand rule, priced by slot on the Barrows calculator.
| Repaired at | A broken piece | A broken set | An hour, one piece |
|---|---|---|---|
| NPC | 1,500,000 | 4,500,000 | 33,333 |
| Stand at 1 | 1,492,500 | 4,477,500 | 33,167 |
| Stand at 60 | 1,050,000 | 3,150,000 | 23,333 |
| Stand at 99 | 757,500 | 2,272,500 | 16,833 |
| Stand at 104 | 720,000 | 2,160,000 | 16,000 |
A piece can only be traded new or broken, and a broken piece often sells for nearly as much as it costs to repair, so the repair table above also gives what it costs to sell yours broken and buy a new one.
Supplies and Eyatlalli
A cooked moss lizard heals a third of your Cooking level or half your Hunter level, whichever is lower, rounded down. A cooked bream heals a third of the lower of your Cooking and Fishing levels. A moonlight potion dose restores the higher of a quarter of your Prayer level and three tenths of your Herblore level, plus 7, and boosts Attack, Strength and Defence more as your Herblore rises: like a super attack from 45, a super strength from 55, a super defence from 66 and more than that from 70. With 75 Hunter and an insect net (85 without), a moonlight moth restores 22 Prayer.
Eyatlalli, beside the chest, takes an undamaged piece of Moon equipment for about a 1 in 50 chance at any of the twelve, the same piece included, with no duplicate protection.
Update history
Every change to this calculator
- The moonlight moth tips now name the insect net, the butterfly net's new name.
- Calculator added