OSRS Prayer Calculator: How to Use It (2025 Guide)

The OSRS Prayer Calculator is an online tool that helps Old School RuneScape players estimate how many bones they need to reach their desired Prayer level based on bone type and altar multipliers.

What is the OSRS Prayer Skill?

In Old School RuneScape (OSRS), Prayer is a combat skill that grants players special abilities, such as protection prayers and stat boosts. Players train Prayer primarily by burying bones, using altars, or grinding bones into ectoplasm for the Ectofuntus.

Prayer is one of the more expensive skills to train, so knowing exactly how many bones you need (and which training method is most cost-effective) can save you millions of GP.

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How to Use the OSRS Prayer Calculator

Follow these steps to get accurate results:

Step 1 – Enter Current Prayer Level

Type your current Prayer level into the “Current Prayer Level” box.
Example: 43 (Protection prayers unlocked).

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Step 2 – Enter Target Prayer Level

Enter your desired Prayer level.
Example: 70 (Piety unlocked).

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Step 3 – Select Bone Type

Choose from a list of popular bones in OSRS, each with a different base XP:

• Bones → +15 XP
• Big Bones → +50 XP
• Dragon Bones → +72 XP
• Dagannoth Bones → +252 XP
• Ourg Bones → +437 XP
• Superior Dragon Bones → +546 XP

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Step 4 – Choose Altar Multiplier

Pick your training method:

• No Altar (1x) – Simply burying bones.
• Gilded Altar with 2 Burners (2x) – Best for XP per bone.
• Ectofuntus (3.5x) – Highest XP, but slower.

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Step 5 – Calculate

Click “Calculate Bones Needed” to see:

• Total XP needed to reach your target.
• Number of bones required (factoring in XP multipliers).

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Example Calculation

• Current Level: 43
• Target Level: 70
• Bone Type: Dragon Bones (+72 XP)
• Method: Gilded Altar (2x)

Result:

• Total XP Needed: 737,627 XP
• Bones Required: 5,124 Dragon Bones

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Pro Tips

• XP Efficiency: If time is not an issue, the Ectofuntus offers the highest XP per bone.
• Cost Efficiency: Consider the GP/XP ratio; sometimes cheaper bones with an altar yield better value.
• Level Milestones: Many players aim for level 43 (protection prayers) or level 70 (Piety) before endgame bosses.

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FAQ – OSRS Prayer Calculator

Does this work for all Prayer levels?
Yes. It supports calculations for levels 1–99.

Is the XP table accurate to OSRS standards?
Yes, it uses the official OSRS XP formula for exact results.

Does it account for XP-boosting events or bonus XP weekends?
No. It’s based purely on standard XP rates.

Can I use it for the Gilded Altar in my own house?
Yes, simply select Gilded Altar (2x).

Is Ectofuntus worth it over Gilded Altar?
Ectofuntus gives more XP but is slower. If you value GP savings over speed, it’s worth considering.