OSRS Prayer Calculator
Find the XP and the number of bones you need to hit a target Prayer level — pick your bone and training method (gilded altar, chaos altar, ectofuntus).
OSRS Prayer Calculator
- Gilded altar — POH or a host's house; both incense burners must be lit (marrentill) for 350%.
- Chaos altar — level 38 Wilderness; 350% and each bone has a 50% chance not to be used, roughly halving bones needed. PKers camp it.
- Ectofuntus — 400%, but each bone needs a pot, a bucket of slime and a trip through the grinder; slowest per hour.
- Prayer pieces don't stack XP boosts here; the Morytania legs 4 make bonemeal to the bank at the Ectofuntus.
Runs in your browser — nothing you enter is uploaded or stored.
Scratchpad auto-saved
How it works — in four simple steps
No signup and nothing to install — it all runs in your browser.
Enter current and target levels
Type your current Prayer level and the level you're aiming for.
Pick your bone
Choose the bone you'll be offering, from regular to superior dragon.
Pick your method
Bury, a gilded/chaos altar (×3.5), or the ectofuntus (×4).
Read the bone count
See the XP needed and exactly how many bones to buy.
Pick “Chaos altar” and the bone count halves — each offering has a 50% chance to keep the bone. Wyvern bones give 72 XP, the same as dragon bones.
Features
XP and bone count in one
Enter your current and target level and get both the Prayer XP needed and the exact number of bones.
Every bone and method
Regular to superior dragon bones, and bury / gilded altar / ectofuntus multipliers.
Official XP table
Uses the real OSRS experience table, so the XP gap is exact.
Instant and private
Recalculates as you change anything; nothing is uploaded.
About the OSRS Prayer Calculator
Training Prayer is about feeding bones for experience. Each bone gives a base amount of Prayer XP — 4.5 for regular bones, 72 for dragon bones, 150 for superior dragon bones — and your training method multiplies it: burying is ×1, a gilded altar with both burners lit is ×3.5, and the ectofuntus is ×4.
This calculator works out the XP gap between your current and target Prayer level using the official XP table, then divides by the XP per bone to tell you exactly how many bones to buy. Pick your bone and method to compare costs — dragon bones on a gilded altar is the classic fast route.
Everything runs in your browser.