Last Updated on July 13, 2026 by Mat Diekhake

The HeatingUp Impact Index is designed to combine traditional basketball statistics with player role and offensive responsibility to provide additional context when evaluating performance. Below are answers to some of the most common questions about how the metric works.

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 that combines points, rebounds, assists, and defensive playmaking with contextual adjustments for a player’s role and offensive usage.

Rather than relying on box score production alone, the metric recognizes that players perform under different responsibilities within their team’s system.

How is the HeatingUp Impact Index calculated?

The 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 the final Impact Index score.

What is STK?

STK is a proprietary statistic used by the HeatingUp Impact Index.

It combines:

STK = Steals Per Game + Blocks Per Game

The purpose of STK is to give defensive playmaking an appropriate place within the overall calculation while keeping the formula simple and transparent.

What is a Role Tier?

Role Tier measures a player’s responsibility within the team’s rotation during a particular season.

The HeatingUp Impact Index currently uses three Role Tiers:

  • Bench
  • Key Contributor
  • Starter/Star

These categories recognize that players contribute in different ways depending on their role within the team.

What is a Usage Tier?

Usage Tier measures a player’s offensive responsibility during a season.

The HeatingUp Impact Index currently uses three Usage Tiers:

  • Low
  • Medium
  • High

Usage Tier reflects offensive involvement rather than simply how many points a player scores.

Are Role Tier and Usage Tier based on one statistic?

No.

Neither category is assigned using a single statistic.

Both are determined using season-specific context, including minutes, offensive role, defensive responsibilities, coaching trust, lineup position, and independent basketball reporting.

Can a player’s Role Tier change?

Yes.

Role Tier is assigned on a season-by-season basis. A player may be a Bench contributor early in a career, become a Key Contributor after earning more minutes, and eventually develop into a Starter/Star.

Can a player’s Usage Tier change?

Yes.

A player’s offensive responsibilities often change because of roster moves, coaching changes, injuries, or player development. As a result, Usage Tier is evaluated independently for each season.

Does a higher Role Tier mean a player is more talented?

No.

Role Tier measures responsibility, not ability.

A productive reserve can outperform a struggling starter, while an emerging player may move into a higher Role Tier in future seasons.

Does a High Usage Tier mean a player is better?

No.

High Usage simply indicates greater offensive responsibility. Some elite defenders, rebounders, and complementary players make significant contributions without leading their team’s offense.

Why doesn’t the HeatingUp Impact Index include shooting percentages?

The HeatingUp Impact Index is intentionally designed to remain transparent and easy to understand.

Points, rebounds, assists, and defensive playmaking form the foundation of the calculation, while Role Tier and Usage Tier provide contextual adjustments. Future versions may evolve, but the current methodology prioritizes consistency across different eras of basketball.

Does the HeatingUp Impact Index replace advanced analytics?

No.

The HeatingUp Impact Index is intended to complement—not replace—existing basketball statistics and advanced metrics.

It offers another perspective by combining production with contextual player responsibilities in a straightforward formula.

Can the HeatingUp Impact Index compare players from different eras?

Yes.

Because the calculation uses widely available box score statistics and season-specific context, it can be applied to players from different eras, leagues, and levels of competition where reliable statistical data is available.

Why are independent basketball sources used when assigning Role Tier and Usage Tier?

Statistics explain what happened on the court, but they do not always explain a player’s responsibilities.

Independent basketball journalism provides valuable context about coaching decisions, offensive roles, defensive assignments, lineup changes, injuries, player development, and how players were viewed during a particular season. That information helps ensure that Role Tier and Usage Tier reflect how a player was actually used rather than relying solely on numerical production.

Will the HeatingUp Impact Index change over time?

Possibly.

Basketball analytics continue to evolve, and the HeatingUp Impact Index may be refined as additional research, testing, and feedback become available. Any significant changes to the methodology will be documented so readers can understand how future versions differ from earlier ones.

For more methodology articles, including multipliers, tier definitions, and version history, visit the Impact Index methodology hub.

See the definition of the Impact Index.