osu! Rework Calculator

Estimate the impact of map reworks on PP and Star Rating.

Beatmap Rework Estimation

Estimated Rework Impact

Estimated New PP: —

PP Change (%): —

Star Rating Difference: —

Formula used: The new PP is estimated by scaling the original PP based on the ratio of the new star rating to the original star rating, adjusted by the mod multiplier.
New PP ≈ Original PP * (New Star Rating / Original Star Rating) * Mod Multiplier
PP Change = New PP – Original PP
PP Change % = (PP Change / Original PP) * 100
Star Rating Difference = New Star Rating – Original Star Rating

Rework Impact Analysis

This calculator estimates how changes to a beatmap’s star rating, often due to reworks or updates, might affect the Performance Points (PP) a player would achieve on a top play. When a beatmap is updated, its difficulty (and thus its star rating) can change. This directly impacts the PP awarded for plays on that map. Our calculator uses a proportional model to predict these changes.

Estimated PP Change Scenarios

Scenario	Original Star	New Star	Original PP	Mods	Estimated New PP	Est. PP Change	Est. PP Change (%)

Chart showing how PP changes based on the ratio of new to old star rating.

What is osu! Rework Impact?

The “osu! Rework Impact” refers to the potential changes in a beatmap’s difficulty and the associated Performance Points (PP) that players can achieve, typically after the beatmap has undergone significant modifications or “reworks.” In the rhythm game osu!, beatmaps are assigned a star rating which serves as an indicator of their difficulty. This star rating is crucial because it directly influences the amount of PP a player earns for a specific play. A rework can involve changes to the arrangement of notes (sliders, spinners, hit circles), the overall flow, the timing, or even the intended difficulty curve. Such alterations can lead to an increase or decrease in the map’s perceived difficulty, resulting in a revised star rating. Consequently, plays on the re-worked map might award more or less PP than they did previously, impacting player rankings and the perceived value of their achievements.

Who Should Use This Calculator?

This calculator is primarily designed for:

• Beatmap Mappers: To estimate how potential changes to their map might affect the PP value for players, helping them gauge the impact of their creative decisions before submitting or updating a beatmap.
• Players: To understand how a map they’ve played might change in value if it’s reworked, and to anticipate potential shifts in their PP and rank.
• Community Observers: Anyone interested in the dynamics of PP gain and how map updates influence the competitive landscape of osu!.

Common Misconceptions

A common misconception is that any rework automatically leads to more PP. In reality, a rework can increase, decrease, or even maintain the PP value if the difficulty remains largely unchanged. Another misconception is that PP is solely determined by the star rating; while it’s a primary factor, other elements like map length, accuracy requirements, and mods also play a significant role. This calculator focuses on the proportional impact of star rating changes, assuming other factors remain constant for simplicity.

osu! Rework Calculator Formula and Mathematical Explanation

The core of the osu! Rework Calculator relies on estimating the new PP value based on the change in star rating and the original PP achieved. The underlying principle is that PP awarded is generally proportional to the difficulty of a beatmap, represented by its star rating.

Step-by-Step Derivation

1. Calculate the Star Rating Ratio: This is the ratio of the new star rating to the original star rating. It quantifies the relative change in difficulty.
   
   Star Ratio = New Star Rating / Original Star Rating
2. Estimate New PP based on Star Ratio: The original PP is scaled by this star ratio. This assumes a direct linear relationship between star rating and PP, which is a simplification but provides a good estimate for moderate changes.
   
   Estimated New PP (without mods) = Original PP * Star Ratio
3. Apply Mod Multiplier: The effective PP value is also influenced by the mods used. The estimated new PP is then multiplied by the appropriate mod multiplier.
   
   Final Estimated New PP = Estimated New PP (without mods) * Mod Multiplier
4. Calculate PP Change: The absolute difference between the estimated new PP and the original PP.
   
   PP Change = Final Estimated New PP – Original PP
5. Calculate PP Change Percentage: The percentage difference relative to the original PP.
   
   PP Change (%) = (PP Change / Original PP) * 100
6. Calculate Star Rating Difference: The absolute difference between the new and original star ratings.
   
   Star Rating Difference = New Star Rating – Original Star Rating

Variable Explanations

Variable	Meaning	Unit	Typical Range
Original Star Rating	The star difficulty of the beatmap before the rework.	Stars (e.g., 5.50)	0.50 – 12.00+
New Star Rating	The estimated star difficulty of the beatmap after the rework.	Stars (e.g., 6.20)	0.50 – 12.00+
Original PP (Top Play)	The Performance Points awarded for a specific top play on the original map, considering mods used.	PP	0 – 1500+
Mod Multiplier	A factor applied based on the mods used (e.g., DT, HR, EZ).	Multiplier (e.g., 1.12 for EZ)	~0.98 (NF) to ~1.65 (HRNC)
Star Ratio	The ratio of new star rating to original star rating.	Ratio (unitless)	Typically 0.5 – 2.0, but can be outside this range.
Estimated New PP	The calculated PP value for the same play on the re-worked map.	PP	Can increase or decrease.
PP Change	The absolute difference in PP.	PP	Can be positive or negative.
PP Change (%)	The relative change in PP as a percentage.	Percent (%)	Can be very large for small original PP values.
Star Rating Difference	The absolute change in star rating value.	Stars	Can be positive or negative.

Practical Examples (Real-World Use Cases)

Here are a couple of scenarios illustrating how the osu! Rework Calculator can be used:

Example 1: Increased Difficulty Rework

Scenario: A mapper is updating a popular 5-star map. They feel it’s slightly too easy for its PP value and want to add more complex patterns and increase the overall flow intensity. They estimate the map’s star rating will increase from 5.50 to 6.20.

Player’s Top Play (Original Map):

• Original Star Rating: 5.50
• Original PP: 450 PP
• Mods Used: Double Time (DT) – Multiplier: 1.12 (osu!standard DT multiplier is 1.12)

Using the Calculator:

• Original Star Rating = 5.50
• New Star Rating = 6.20
• Original PP = 450
• Mod Multiplier = 1.12

Calculated Results:

• Star Ratio = 6.20 / 5.50 ≈ 1.127
• Estimated New PP (without mods) = 450 * 1.127 ≈ 507.15
• Final Estimated New PP = 507.15 * 1.12 ≈ 568.01 PP
• PP Change = 568.01 – 450 ≈ 118.01 PP
• PP Change (%) = (118.01 / 450) * 100 ≈ 26.22%
• Star Rating Difference = 6.20 – 5.50 = 0.70 stars

Interpretation: The rework significantly increased the map’s difficulty, leading to an estimated boost of approximately 118 PP (a 26.22% increase) for the same play. This suggests the reworked map will be more rewarding.

Example 2: Decreased Difficulty Rework (Simplification)

Scenario: A mapper realizes a section of their map is unnecessarily frustrating or poorly timed, making it feel unfairly difficult. They decide to simplify this section, aiming to improve the map’s overall flow and playability. They predict the star rating will drop from 7.00 to 6.75.

Player’s Top Play (Original Map):

• Original Star Rating: 7.00
• Original PP: 650 PP
• Mods Used: Hard Rock (HR) – Multiplier: 1.06

Using the Calculator:

• Original Star Rating = 7.00
• New Star Rating = 6.75
• Original PP = 650
• Mod Multiplier = 1.06

Calculated Results:

• Star Ratio = 6.75 / 7.00 ≈ 0.964
• Estimated New PP (without mods) = 650 * 0.964 ≈ 626.6
• Final Estimated New PP = 626.6 * 1.06 ≈ 664.19 PP
• PP Change = 664.19 – 650 ≈ 14.19 PP
• PP Change (%) = (14.19 / 650) * 100 ≈ 2.18%
• Star Rating Difference = 6.75 – 7.00 = -0.25 stars

Interpretation: Although the star rating decreased slightly, the impact on PP is minimal (a small increase in this case due to the specific values). This might indicate that the simplified patterns, while easier, are still challenging enough or that the decrease in star rating wasn’t drastic enough to significantly alter the PP value for this particular play. It’s important to note that the relationship isn’t always perfectly linear, especially with very high star ratings or complex mod combinations.

How to Use This osu! Rework Calculator

Using the osu! Rework Calculator is straightforward. Follow these steps to estimate the potential impact of a map rework on PP values:

1. Input Original Star Rating: Enter the current star rating of the beatmap.
2. Input New Star Rating: Estimate and enter the target star rating after the rework. This might be based on mapper intuition, community feedback, or other difficulty analysis tools.
3. Input Original PP (Top Play): Provide the PP value of a significant play on the *original* map. This value should correspond to the mods you intend to select.
4. Select Active Mods: Choose the mods that were used for the top play you entered. The calculator uses these to adjust the PP calculation.
5. Calculate Changes: Click the “Calculate Changes” button.

How to Read Results

• Estimated New PP: This is the predicted PP value for the same play on the re-worked map.
• Estimated PP Change: The absolute difference between the new estimated PP and the original PP. A positive value means more PP, negative means less.
• Estimated PP Change (%): The percentage change in PP relative to the original PP. This provides context for the magnitude of the change.
• Star Rating Difference: The numerical difference between the new and original star ratings.

Decision-Making Guidance

Use these results to inform decisions:

• Mappers: If the estimated PP change is significantly higher than intended, you might need to adjust the difficulty downwards. Conversely, if it’s lower, you might consider increasing it.
• Players: Understand that if a map you value highly gets reworked and its star rating increases, your top play might become worth even more PP. If it decreases, the PP value might drop.
• Community: The calculator helps foster discussion about map balance and the impact of updates on the PP economy.

Key Factors That Affect osu! Rework Results

While the calculator simplifies the process, several real-world factors influence the actual PP outcome of a map rework:

1. Accuracy & Performance: The calculator assumes the player performs identically on the re-worked map. In reality, a rework might make the map harder or easier to acc, affecting the achieved accuracy and thus the actual PP. For example, a harder section might lead to lower accuracy, reducing the final PP even if the star rating increased.
2. Map Length and Streaminess: Longer maps or maps with intense streams can sometimes receive disproportionately higher PP due to how scoring and difficulty are calculated. Reworks affecting these aspects can have a significant impact beyond simple star rating ratios.
3. Specific Accusations (AR, OD, HP, CS): While star rating is a primary driver, the underlying accuracy settings (Approach Rate, Overall Difficulty, HP Drain, Circle Size) also contribute to a map’s feel and difficulty. Changes to these can affect perceived difficulty and player performance in ways not fully captured by the star rating alone.
4. Mod Combinations and Interactions: Some mod combinations have complex interactions or are not always linearly scaled. For instance, combining EZ with HR can have unusual effects. The calculator uses general multipliers, but the actual PP system might have nuances.
5. Changes in ppv2 Algorithm: The PP calculation algorithm in osu! (ppv1, ppv2) has evolved. While this calculator uses a simplified model based on current ppv2 principles, future algorithm changes could alter the precise PP values awarded.
6. Subjectivity of Difficulty: Player skill sets vary. What one player finds easier or harder might differ for another. A rework might appeal more to certain playstyles, leading to different PP outcomes for different players, even with the same mods.
7. The “Star Rating Gap”: Jumps in star rating (e.g., from 4.0 to 6.0) are much more impactful than smaller adjustments (e.g., 5.5 to 5.7). The calculator reflects this, but the actual ppv2 formula has non-linear elements that make extreme shifts particularly sensitive.
8. Mapper Intent vs. Player Perception: A mapper might intend a section to be harder, but players might find a different, unintended section more challenging. Reworks that misalign with player perception can lead to surprising PP changes.

Frequently Asked Questions (FAQ)

Q: Does the calculator predict the exact new PP value?

A: No, this calculator provides an *estimation*. The actual PP awarded depends on the complex osu! scoring algorithm (ppv2), which considers many factors beyond just the star rating, such as accuracy, combo, and specific note patterns. This tool uses a proportional model based on star rating changes.

Q: Can I use this calculator if the map is ranked?

A: Yes, you can use it to estimate changes for any map, whether it’s ranked, unranked, or in WIP. It’s particularly useful for mappers updating their own beatmaps.

Q: What if the map becomes significantly easier or harder? Will the estimate still be accurate?

A: The proportional model works best for moderate changes. For extreme shifts in difficulty (e.g., a 2-star increase or decrease), the estimation might be less precise due to the non-linear nature of the ppv2 algorithm.

Q: What does “Original PP (Top Play)” mean?

A: It’s the PP value you achieved for your best play on the *original* version of the map. This value is crucial because the calculator scales it based on the star rating change.

Q: Why is the Mod Multiplier important?

A: Mods like Double Time (DT), Hard Rock (HR), and Hidden (HD) significantly affect a map’s difficulty and the PP awarded. The multiplier adjusts the estimated new PP to account for the specific mods used in your top play.

Q: What if I want to see how PP changes with different mods?

A: You would need to run the calculator multiple times, each time entering the Original PP and selecting the desired Mod for that specific calculation scenario.

Q: How accurate is the star rating input?

A: The accuracy of the “New Star Rating” input depends entirely on your estimation. This calculator assumes your predicted star rating is correct. Tools like the osu! Difficulty Analyzer can help estimate star ratings.

Q: Does this calculator account for changes in combo or accuracy?

A: No, this calculator assumes that the player would achieve the same combo and accuracy on the re-worked map as they did on the original. The PP change is purely based on the star rating adjustment and mods.

Q: Can this calculator be used for osu!mania or Catch the Beat?

A: No, this calculator is specifically designed for osu!standard and its PP system. Other game modes have different scoring and PP mechanics.