OSRS Prayer Calculator
Compare bone-burying and altar methods by XP per offering. Enter exact current XP and a target, then compare the distinct methods in this skill’s public training data.
Loads public levels; manual entry always remains available.
| Action | Req. | XP | Actions | Gross cost |
|---|---|---|---|---|
| Bones | 1 | 4.5 | 2,896,541 | 347,584,920 gp |
| Big bones | 1 | 15 | 868,963 | 330,205,940 gp |
| Dragon bones | 1 | 72 | 181,034 | 561,205,400 gp |
| Dragon bones — gilded altar | 1 | 252 | 51,724 | 160,344,400 gp |
| Superior dragon bones — altar | 70 | 525 | 24,828 | 310,350,000 gp |
How the Prayer calculator works
Prayer methods multiply the base experience of bones. A gilded altar with both burners lit gives 3.5 times base XP; the Chaos altar uses the same displayed XP while its save chance changes expected bone consumption.
Worked example
Using Bones at 4.5 XP per successful action, a goal from zero XP to level 2 needs 19 complete actions because level 2 starts at 83 XP. The same ceiling rule prevents a fractional final action.
Reading the Prayer methods
Compare bone-burying and altar methods by XP per offering. The dataset begins with Bones at level 1, worth 4.5 XP per listed action, and reaches Superior dragon bones — altar at level 70. That level range is why the minimum-level filter is useful: it removes methods the account does not want to consider without changing the XP calculation itself.
Among the rows shown for Prayer, Superior dragon bones — altar has the largest single listed reward at 525 XP. A larger reward per action does not automatically mean better XP per hour. One action may be a lap, a catch, a spell, a health check, a completed item or a quantity of damage, so compare an action count with the real completion rate for that exact row.
The individual methods are materially different. Bones requires level 1, gives 4.5 XP, and carries a rounded 120 gp input snapshot; Big bones requires level 1, gives 15 XP, and carries a rounded 380 gp input snapshot; Dragon bones requires level 1, gives 72 XP, and carries a rounded 3,100 gp input snapshot; Dragon bones — gilded altar requires level 1, gives 252 XP, and carries a rounded 3,100 gp input snapshot; Superior dragon bones — altar requires level 70, gives 525 XP, and carries a rounded 12,500 gp input snapshot.
For a costed method, “gross cost” is action count multiplied by the stored input snapshot. It is not net loss: valuable outputs, recovered ammunition, harvest value, or alchemy proceeds may offset it. For an unpriced method, the dash means the dataset intentionally avoids inventing a cost; it does not mean the method is always free.
Filter by minimum level to remove early methods without changing current XP. This keeps the distance to the target exact while narrowing the comparison to methods the account intends to use. To estimate session time, divide the result by a personally measured actions-per-hour rate for the same method and setup.
Prayer questions
How much XP is level 99 Prayer?
How are Prayer actions rounded?
Are Prayer costs live?
What can change a Prayer training estimate?
Sources
The fixed XP and requirement rows were transcribed from the public skill and training tables and reviewed on 4 September 2026. Price fields are editable data snapshots, not live quotes.
- Old School RuneScape Wiki — Experience — Public XP table and level formula, reviewed 2026.
- Old School RuneScape Wiki — Combat level — Seven-stat combat-level formula, reviewed 2026.
- Old School RuneScape Wiki — Maximum melee hit — Effective Strength and maximum-hit formula, reviewed 2026.
- Old School RuneScape Wiki — Attack roll — Accuracy and defence-roll mechanics, reviewed 2026.
- Old School RuneScape Wiki — Calculators — Public skill, activity and reward tables, reviewed 2026.