A tool used within the Old School RuneScape (OSRS) community to estimate the amount of experience points (XP) required to reach a specific Prayer level, along with the resources and costs associated with various training methods. These tools generally allow users to input their current Prayer level, their target level, and the desired training method (e.g., burying bones, using an altar with specific bonuses). The calculator then outputs the number of bones, dragon bones, or other items needed, as well as the total experience points required and the estimated Grand Exchange (GE) cost.
The importance of these tools stems from the time and resource investment required to train the Prayer skill effectively in OSRS. The skill is vital for accessing powerful prayers that enhance combat abilities, making it a crucial element for player progression. These calculators provide players with a transparent view of the resources required, enabling informed decision-making regarding training methods and resource allocation. They also serve as a valuable planning aid, allowing players to set realistic goals and track their progress towards achieving desired Prayer levels. Historically, these calculating tools emerged as player-created utilities due to the lack of official in-game support for detailed training planning.