##  [Normalized Discounted Cumulative Gain (nDCG)](/normalized-discounted-cumulative-gain-ndcg) 

  ##  [Normalized Discounted Cumulative Gain (nDCG)](https://information.quantumdictionary.io/normalized-discounted-cumulative-gain-ndcg-0) 

  

 [![Information & Communication Dictionary](/sites/default/files/styles/large/public/2026-01/Information%20%26%20Communication.png.webp?itok=g4emS-T7)](/topic-specific-dictionaries/information-communication)



**Information & Communication Dictionary**

 







 

 

 

 



 

 

 

 

Definition

A position-sensitive ranked-retrieval metric that sums graded relevance gains across result positions with a logarithmic discount by rank (commonly using 1 / log2(rank+1)), producing Discounted Cumulative Gain (DCG), and then normalizes DCG by the ideal DCG (IDCG) for that query to yield nDCG in the range [0,1]. It supports multi-level (graded) relevance judgments.