The Forge Reroll Calculator
Calculate the probability and cost of getting your desired race in The Forge
Reroll Calculator
Select your target race and calculate the probability of obtaining it, expected reroll attempts, success rates, and Robux costs at different confidence levels. Each reroll pack (10 rerolls) costs 575 Robux.
How It Works
- Geometric Distribution: Our calculator uses proven mathematical formulas based on geometric distribution to provide accurate probability predictions.
- Robux Cost: Each pack of 10 rerolls costs 575 Robux (57.5 Robux per reroll). Costs are calculated automatically based on reroll requirements.
- Expected Robux Cost vs Cost for Your Rerolls:
- Expected Robux Cost: Based on the mathematical average (expected rerolls = 1/probability). This is the theoretical average cost if you were to get the race "on average".
- Cost for Your Rerolls: Based on the exact number of rerolls you entered. This shows the actual cost for your planned reroll attempts.
- Pack Success Rate: Shows the probability of getting at least one target race in a single 10-reroll pack using the formula: P_pack = 1 - (1 - p)^10
- Confidence Levels: 50%, 90%, and 99% confidence levels show how many rerolls you need for each probability of success.
Reroll Strategy Tips
For Common Races (25%)
- Very high success rate with just a few rerolls
- Expected to get within 1-4 rerolls
- Good starting point for new players
- Save rerolls for rarer races if you already have a common one
For Uncommon Races (14-15%)
- Moderate success rate with 5-10 rerolls
- Expected to get within 5-7 rerolls
- Good balance between rarity and obtainability
- Consider if you need specific bonuses
For Rare Races (8-10.5%)
- Lower success rate, need 10-15 rerolls typically
- Expected to get within 9-12 rerolls
- Plan ahead and save rerolls
- Use promo codes to maximize attempts
For Epic Races (6-7%)
- Requires significant reroll investment
- Expected to get within 14-17 rerolls
- Save all free rerolls before attempting
- Consider if the bonuses match your playstyle
For Legendary Races (1.25-1.75%)
- Very rare, requires many rerolls
- Expected to get within 57-80 rerolls
- Use all available reroll sources
- Be patient and persistent
For Mythical Races (0.5%)
- Extremely rare, very difficult to obtain
- Expected to get within 138-200 rerolls
- Consider using alt accounts to test
- Focus on free reroll sources first
Race Rarity Reference
How to Get More Rerolls
Starter Freebies
Talk to Sensei Moro at spawn for 3 free rerolls when you first start.
Quest Rewards
Complete main questline, reach World 2, and finish Captain Rowan quests for reroll rewards.
Daily Logins
Log in consistently to receive occasional reroll spins as daily rewards.
Promo Codes
Redeem promo codes in Settings → Codes for 2-5 rerolls each. Check our codes page regularly for updates.
View Promo CodesRelated Tools
Frequently Asked Questions
How does the reroll calculator work?
The calculator uses probability mathematics to determine your chances of getting a specific race. It calculates the success rate based on the race's drop probability and the number of rerolls you have available.
What does "Expected Rerolls Needed" mean?
This is the average number of rerolls you would need to get the target race. It's calculated as 1 divided by the probability. For example, a 10% chance race has an expected value of 10 rerolls.
What is the confidence level?
Confidence levels show how many rerolls you need for a certain probability of success. 50% confidence means you have a 50% chance of getting the race, while 90% confidence means a 90% chance.
Are the probabilities guaranteed?
No. These are statistical probabilities. You might get the race on your first reroll, or you might need many more than expected. The calculator shows the mathematical likelihood, not a guarantee.