OSRS Prayer Calculator (Bones, Altars & GP Cost to 99)

✨ Old School RuneScape Prayer

OSRS Prayer Calculator (Bones, Altars & GP Cost to 99)

Calculate exact bones, ashes, and GP required for level 43, 77 (Rigour/Augury), or 99 Prayer using the Chaos Altar, Gilded Altar, and Ectofuntus.

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Bone Type & Altar Multiplier




⚠️ Values modified — Click “Calculate Prayer XP” to update

📊 Calculated Outputs
Experience Required
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XP to target level

Bones / Ashes Required
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Inventory items to sacrifice

Estimated Total GP
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Approximate Grand Exchange cost

Effective XP per Bone
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Including altar & bone-save multipliers

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How to Use the OSRS Prayer Calculator (Bones, Altars & GP Cost to 99)

Prayer is the most crucial defensive skill in Old School RuneScape, unlocking damage-nullifying protection prayers and massive combat buffs like Piety, Rigour, and Augury. However, Prayer is also a 'buyable' skill that can consume tens of millions of GP if trained without an optimal altar multiplier.

Our OSRS Prayer Calculator calculates the exact number of bones, ashes, and gold pieces required to reach key prayer levels, contrasting safe POH Gilded Altars with high-efficiency Wilderness Chaos Altar methods.

Formula & Calculation Methodology

\text{Effective XP} = \text{Base XP} \times M_{\text{Altar}} \times S_{\text{Chaos}}, \quad \text{Bones} = \left\lceil \frac{\Delta\text{XP}}{\text{Effective XP}} \right\rceil
  • M_Altar: 3.5x for Gilded/Chaos Altar, 4.0x for Ectofuntus, 1.0x for Burying
  • S_Chaos: 2.0x effective multiplier at Wilderness Chaos Altar due to 50% bone preservation
  • Target 77: Unlocks Rigour (74) and Augury (77), essential PvM prayers

XP progression matches official Old School RuneScape exponential level tiers. Altar multipliers reflect 3.5x for Gilded/Chaos and 50% geometric retention at the Chaos Altar.

OSRS Prayer Training Comparison (Dragon Bones, Level 43 to 77)

Training Location Effective XP / Bone Bones Needed (43-77) Total Cost (~2,600 GP) Risk Level
Wilderness Chaos Altar 504.0 XP ~2,875 Bones ~7.47M GP Wilderness PvP Risk
POH Gilded Altar 252.0 XP ~5,750 Bones ~14.95M GP 100% Safe (No Risk)
Ectofuntus 288.0 XP ~5,031 Bones ~13.08M GP Safe (Very Click Intensive)
Regular Burying 72.0 XP ~20,125 Bones ~52.32M GP Inefficient (Waste of GP)

Frequently Asked Questions

Why is the Wilderness Chaos Altar considered the best method?
The Chaos Altar grants the exact same 350% XP multiplier as a Gilded Altar, but provides a 50% chance for bones not to be consumed. This effectively doubles your XP per bone (700% equivalent XP), cutting prayer training costs in half.
How do you protect bones from PKers at the Chaos Altar?
Bring an unnoted inventory of 28 bones with burning amulets to teleport to the Lava Maze. Do not bring noted bones unless unnoting with the nearby NPC in small batches. Use the 'Suicide' method on the wine of zamorak upon finishing each inventory to quickly respawn in Lumbridge.
What is the most important Prayer milestone in OSRS?
Level 43 unlocks all protection prayers (Protect from Melee, Missiles, Magic). Level 70 unlocks Piety (King's Ransom quest). Level 74 unlocks Rigour, and Level 77 unlocks Augury.
Can you use bones on altars in F2P?
No. The Gilded Altar and Wilderness Chaos Altar are members-only features. F2P players can only bury bones normally or use bone fragments in the Ruins of Camdozaal.
Are Superior Dragon Bones worth the extra cost?
Superior Dragon Bones (requiring 70 Prayer to use) yield 150 base XP and achieve up to 1.1M XP/hour. They are worth it for wealthy players seeking fast level 99s, but Dragon Bones offer better GP-to-XP efficiency.

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