Last Updated on August 8, 2026 by Mat Diekhake
The HeatingUp Impact Index was created to provide a transparent and consistent way to evaluate basketball players using measurable production and player context. By combining traditional box-score statistics with adjustments for offensive responsibility and team role, the metric offers a broader view of overall player impact.
For the complete formula, weighting system, and worked example, see the Impact Index calculation page.
What is the HeatingUp Impact Index?
The HeatingUp Impact Index is a proprietary basketball metric developed by HeatingUp to estimate a player’s overall statistical impact.
The formula combines:
- Points per game (PPG)
- Rebounds per game (RPG)
- Assists per game (APG)
- STK (Steals + Blocks)
- Usage Tier
- Role Tier
The goal is to create a simple, transparent rating that recognises complete basketball production rather than focusing on scoring alone.
How is the HeatingUp Impact Index calculated?
The current formula is:
Impact Index = 2 × (PPG + RPG + APG + STK) × Usage Tier × Role Tier
Where:
- PPG = Points Per Game
- RPG = Rebounds Per Game
- APG = Assists Per Game
- STK = Steals Per Game + Blocks Per Game
The statistical total is then adjusted using Usage Tier and Role Tier to produce a final Impact Index rating.
What is STK?
STK is a HeatingUp statistic that combines a player’s steals and blocks into a single defensive metric.
STK = Steals Per Game + Blocks Per Game
The purpose of STK is to recognise defensive playmaking while keeping the methodology simple, transparent, and easy to calculate.
Why does the Impact Index use STK instead of separate steals and blocks?
Steals and blocks are different defensive skills, but both represent defensive plays that directly disrupt an opponent’s possession.
Combining them into STK creates a straightforward measure of defensive playmaking that can be applied consistently across different positions and eras.
What is Role Tier?
Role Tier reflects a player’s responsibilities within their team’s structure.
Rather than relying solely on box-score production, Role Tier recognises that players are asked to perform different jobs depending on their role within the rotation.
Examples of Role Tiers include:
- Franchise Cornerstone
- Primary Offensive Engine
- Two-Way Star Wing
- Lead Playmaking Guard
- Defensive Anchor Center
- Secondary Scoring Star
- 3-and-D Wing
- High-Usage Sixth Man
- Energy Big
- Developmental Prospect
Role Tier provides context for how a player contributes to team success.
How is Role Tier assigned?
Role Tier is determined through a combination of factors, including:
- Minutes played
- Starting status
- Offensive responsibility
- Defensive responsibility
- Team hierarchy
- Usage Tier
- Coaching trust
- Closing lineup appearances
- Overall importance to team success
No single statistic determines a player’s Role Tier.
What is Usage Tier?
Usage Tier reflects a player’s level of offensive responsibility.
The HeatingUp Impact Index currently uses three Usage Tier classifications:
- Low Usage
- Medium Usage
- High Usage
Usage Tier measures offensive involvement rather than simply scoring volume.
How is Usage Tier determined?
Usage Tier is assigned using a combination of factors such as:
- Ball-handling responsibility
- Shot creation duties
- Playmaking workload
- Offensive initiation responsibilities
- Team offensive structure
- Statistical production
The objective is to reflect how heavily a player is involved in generating offence for their team.
Can a player’s Role Tier change?
Yes.
Player roles evolve throughout their careers and sometimes within a season.
Factors that may affect Role Tier include:
- Trades
- Injuries
- Coaching changes
- Roster moves
- Player development
- Changes in team strategy
Role Tier is evaluated on a season-by-season basis.
Can a player’s Usage Tier change?
Yes.
A player’s offensive workload can change significantly from season to season depending on roster construction, coaching decisions, injuries, and overall team needs.
Does a higher Role Tier mean a player is more talented?
No.
Role Tier measures responsibility, not talent.
Some players thrive in specialised roles, while others carry larger workloads. The classification reflects how a player is used, not necessarily how skilled they are.
Does a High Usage Tier mean a player is better?
No.
High Usage simply indicates greater offensive responsibility.
Many elite defenders, rebounders, and complementary players make enormous contributions despite carrying relatively modest offensive workloads.
Why doesn’t the Impact Index include advanced tracking data?
The HeatingUp Impact Index is intentionally built around statistics that are publicly available, easy to verify, and historically consistent.
This approach allows the metric to remain transparent, reproducible, and applicable across multiple eras and leagues.
Does the Impact Index replace advanced analytics?
No.
The HeatingUp Impact Index is designed to complement—not replace—existing basketball statistics and advanced metrics.
It provides another perspective by combining statistical production with contextual player responsibilities.
How does the Impact Index differ from PER, BPM, Win Shares, RAPTOR, or EPM?
Most advanced metrics rely on sophisticated mathematical modelling, play-by-play data, lineup data, or proprietary calculations.
The HeatingUp Impact Index takes a different approach by prioritising:
- Transparency
- Simplicity
- Consistency
- Player context
Its methodology is fully documented and can be independently verified using publicly available information.
Can the Impact Index compare players from different eras?
Yes.
Because the formula uses widely available box-score statistics and contextual role information, it can be applied across different eras where reliable statistical records exist.
However, historical comparisons should always consider differences in pace, rules, competition, and playing style.
Can the Impact Index be used for the WNBA?
Yes.
The methodology is designed to work across both the NBA and WNBA.
WNBA players are evaluated using the same core principles of production, offensive responsibility, and role context.
Can the Impact Index be used for international leagues?
Yes.
The long-term goal of the HeatingUp Impact Index is to expand coverage across major international basketball competitions where reliable statistical data is available.
League-specific rankings will remain separate to preserve competitive context.
Why are independent basketball sources used when assigning Role Tier and Usage Tier?
Statistics explain what happened on the court.
Independent reporting often explains why.
Basketball journalism, scouting reports, coaching analysis, and season coverage provide important context regarding player responsibilities, offensive roles, defensive assignments, lineup changes, and overall team structure.
This helps ensure that Role Tier and Usage Tier accurately reflect how players were actually used.
Will the HeatingUp Impact Index change over time?
Possibly.
Basketball analytics continues to evolve, and the HeatingUp Impact Index may be refined as additional research, testing, and feedback become available.
Any significant methodology changes will be documented so readers can understand exactly what changed and why.
Final Thoughts
The HeatingUp Impact Index was created to provide a transparent, consistent, and easy-to-understand framework for evaluating basketball players. By combining traditional production with player context, it offers another way to compare athletes, explore historical performance, and better understand the many ways players contribute to winning basketball.
For a complete breakdown of the methodology, calculations, and supporting resources, explore the full HeatingUp Impact Index section.
For more methodology articles, including multipliers, tier definitions, and version history, visit the Impact Index methodology hub.
See the definition of the Impact Index.