Calculator
Example Data Table
| Tree | Base Chance | Level 99 Chance | Example Actions | Example Chance |
|---|---|---|---|---|
| Teak tree | 1 in 264,336 | 1 in 261,861 | 10,000 | 3.746829% |
| Yew tree | 1 in 145,013 | 1 in 142,538 | 10,000 | 6.775253% |
| Magic tree | 1 in 72,321 | 1 in 69,846 | 10,000 | 13.339599% |
| Redwood tree | 1 in 72,321 | 1 in 69,846 | 10,000 | 13.339599% |
| Willow tree | 1 in 289,286 | 1 in 286,811 | 10,000 | 3.426540% |
Formula Used
The calculator uses the known beaver pet chance formula:
Actual denominator = Base chance - Woodcutting level × 25
Single roll chance = 1 ÷ Actual denominator
Chance after actions = 1 - (1 - Single roll chance)actions
The expected action count equals the actual denominator. This is not a guarantee. It is only the average point across many similar grinds.
How to Use This Calculator
- Select the tree you are cutting.
- Enter your current Woodcutting level.
- Add completed actions to check your current pet odds.
- Add planned actions to estimate a future session.
- Enter actions per hour for time estimates.
- Set a target chance, such as 50 or 90 percent.
- Press Calculate to view the result above the form.
- Use CSV or PDF buttons to save the report.
Why Use an OSRS Beaver Pet Calculator
The beaver is a rare Woodcutting pet. It can appear while cutting many trees in Old School RuneScape. The roll is small, so players often want clear numbers before planning long sessions. This calculator turns tree choice, Woodcutting level, completed cuts, future cuts, and hourly speed into useful probability estimates.
What This Tool Measures
The tool estimates the chance of receiving at least one beaver pet across a chosen number of rolls. It also shows the dry chance, expected rolls, expected hours, and the number of actions needed for a target confidence level. This does not promise a drop. It only models independent random rolls. You can still receive the pet early. You can also go far beyond rate.
Why Tree Choice Matters
Each tree has its own base chance. Magic and redwood trees have low denominators, but they are slower. Teaks have a higher denominator, yet their speed can make them attractive for active training. The best option depends on your goal. Some players want relaxed logs. Others want faster rolls. This calculator supports both views by using your personal action rate.
Planning Long Sessions
Pet hunting can feel unclear without probability context. A large number of cuts may still produce a modest chance. The expected roll count is useful, but it is not a guarantee. A fifty percent chance means many players still miss the pet. A ninety percent chance still leaves a real dry path. These outputs help you plan realistic time, logs, and expectations.
Advanced Options
The extra fields help compare routes without changing the formula. Change actions per hour for active, semi active, or relaxed play. Change planned actions to test short trips, weekend goals, or very long grinds more clearly.
Using Results Wisely
Enter your current Woodcutting level first. Pick the tree that matches your method. Add completed cuts if you want to check your current dry streak. Add planned cuts and logs per hour to estimate future sessions. The result card will update after submission. Download the CSV or PDF when you need a record. Always treat the answer as an estimate, because game rolls are random. Use it as a planning guide, not a promise.
FAQs
What does this beaver pet calculator do?
It estimates your chance of receiving the OSRS beaver pet from Woodcutting actions. It uses your tree, level, completed actions, planned actions, and speed.
Does the calculator guarantee the pet?
No. It only gives probability estimates. OSRS pet drops are random. You can get the pet early or go very dry.
Why does Woodcutting level matter?
The denominator is reduced by your Woodcutting level multiplied by 25. Higher levels give a slightly better chance per action.
Which tree is best for the beaver pet?
It depends on your action speed and play style. Fast methods can produce more rolls, while slower methods may offer better per-action odds.
What are completed actions?
Completed actions are the successful tree cuts or resource rolls you already made. They help estimate your current dry streak probability.
What are planned future actions?
Planned actions are the extra cuts you expect to perform. The calculator uses them to estimate future chance and session time.
Can I use virtual Woodcutting levels?
Yes. The level input supports values up to 126. Use 99 if you prefer standard visible level calculations.
Why add CSV and PDF downloads?
Downloads let you save your result, compare methods, track grinds, or keep records for later planning without recalculating everything.