Runescape Prayer Calculator

Calculate exactly how many bones you need for your next Prayer goal.

Comparison of Common Bones for your Target

Bone Type	XP per Bone	Total Needed

What is a Runescape Prayer Calculator?

A runescape prayer calculator is an essential tool for players of Old School RuneScape (OSRS) and RuneScape 3 who want to train their Prayer skill efficiently. Prayer is one of the most expensive and time-consuming skills to train, as it often involves sacrificing bones or ashes at various altars. Using a runescape prayer calculator allows you to input your current experience points and your target level, helping you determine exactly how many resources you need to purchase from the Grand Exchange.

Whether you are a hardcore Ironman looking to grind out 99 Prayer at the Chaos Altar or a main account calculating the cost of Dragon Bones at a Gilded Altar, this tool provides the precision needed to avoid over-purchasing supplies. Many players mistakenly believe that burying bones is the only way to train, but a runescape prayer calculator highlights the massive experience multipliers available through alternative methods.

Runescape Prayer Calculator Formula and Mathematical Explanation

The math behind Prayer training is straightforward but varies significantly based on the method used. The basic formula used by our runescape prayer calculator is:

Bones Needed = (Target XP – Current XP) / (Base Bone XP × Method Multiplier)

Variables used in the calculation:

Variable	Meaning	Unit	Typical Range
Target XP	Experience required for the goal level	Points	0 – 200,000,000
Current XP	Your current character experience	Points	0 – 199,999,999
Base Bone XP	XP gained from burying the bone manually	Points	4.5 – 150
Method Multiplier	The bonus applied by the altar or tool	Multiplier	1.0x – 7.0x

Practical Examples (Real-World Use Cases)

Example 1: The Road to Level 70 (Piety)
A player has 101,333 XP (Level 50) and wants to reach Level 70 (737,627 XP) for the Piety prayer. They plan to use Dragon Bones at a Gilded Altar.

Input: Current XP: 101,333 | Target: 737,627 | Bone: Dragon Bones (72 XP) | Method: Gilded Altar (3.5x).

Calculation: (737,627 – 101,333) / (72 * 3.5) = 2,525 Dragon Bones.

Example 2: Ironman at the Chaos Altar
An Ironman has 5,000,000 XP and wants to hit 13,034,431 XP (Level 99) using Superior Dragon Bones at the Chaos Altar.

Input: Current XP: 5,000,000 | Target: 13,034,431 | Bone: Superior Dragon Bones (150 XP) | Method: Chaos Altar (7.0x effective).

Calculation: (13,034,431 – 5,000,000) / (150 * 7.0) = 7,652 Superior Dragon Bones.

How to Use This Runescape Prayer Calculator

1. Enter Current XP: Log into your game account and copy your exact Prayer XP from the skills tab into the “Current Prayer XP” field.
2. Set Your Goal: You can enter a level (like 99) or a specific XP amount if you are chasing a post-99 milestone.
3. Select Your Bone: Choose the bone type you can afford or have gathered. Dragon bones are the most common for high-level training.
4. Choose Your Method: This is critical. Selecting “Chaos Altar” will significantly reduce the number of bones required compared to regular burying.
5. Analyze the Results: The runescape prayer calculator will instantly show you the total bones needed and the number of inventory trips required.

Key Factors That Affect Runescape Prayer Calculator Results

• Method Efficiency: The Chaos Altar in the Wilderness offers the same 3.5x multiplier as a Gilded Altar but has a 50% chance to not consume the bone, effectively doubling your XP per bone (7.0x average).
• Travel Time: While the runescape prayer calculator tells you the quantity, your actual XP per hour depends on how fast you can bank. Using a Player Owned House (POH) with a mounted Glory or Teleport Nexus is vital.
• Bonecrusher: This item automatically buries bones from defeated monsters. While it provides lower XP than an altar, it offers “passive” XP that adds up over time during Slayer tasks.
• Ensouled Heads: Not all prayer training uses bones. Arceuus spellbook allows you to reanimate heads, which provides excellent XP but is calculated differently than traditional bone burying.
• Wilderness Risk: Using the Chaos Altar is the most cost-effective method shown by the runescape prayer calculator, but it carries the risk of being attacked by other players.
• Input Accuracy: Always ensure you are using the correct target XP. Level 99 is exactly 13,034,431 XP; entering 13,000,000 will leave you just short of your cape.

Frequently Asked Questions (FAQ)

1. Is the Chaos Altar better than the Gilded Altar?

Mathematically, yes. The runescape prayer calculator shows that you need half the bones at the Chaos Altar compared to the Gilded Altar on average due to the 50% save chance.

2. Can I calculate XP for levels above 99?

Yes, the calculator accepts XP inputs up to 200,000,000, which is the maximum experience possible in RuneScape.

3. What are the most cost-effective bones to use?

This changes with Grand Exchange prices. Usually, Big Bones are cheaper per XP but much slower, while Dragon Bones offer a balance of speed and cost.

4. Does the Bonecrusher work with the altar multipliers?

No, the Bonecrusher only provides the base burying XP (or a percentage thereof depending on the version).

5. How many burners do I need for a Gilded Altar?

You must have two burners lit with Marrentill to receive the 3.5x multiplier (350%) from a Gilded Altar.

6. Does this calculator work for RuneScape 3?

The bone XP values are primarily based on OSRS, but the mathematical logic of the runescape prayer calculator remains the same for both games.

7. Is Ectofuntus still worth using?

Ectofuntus gives a 4.0x multiplier, which is higher than a Gilded Altar (3.5x), but it is much slower due to the bone meal grinding process.

8. What is the fastest way to 99 Prayer?

Using Superior Dragon Bones on a Gilded Altar or Chaos Altar is currently the fastest training method in the game.