Statistics Calculators

Decile Calculator

Calculate the nine decile boundaries (D1 through D9) that split a sorted dataset into ten equal-sized parts.

D1 (10th percentile) —

D2 (20th percentile) —

D3 (30th percentile) —

D4 (40th percentile) —

D5 (50th percentile / median) —

D6 (60th percentile) —

D7 (70th percentile) —

D8 (80th percentile) —

D9 (90th percentile) —

About the Decile Calculator

Deciles divide a sorted dataset into ten equal-sized groups, each containing 10% of the values. D1 marks the boundary below which 10% of the data falls, D5 is the median, and D9 marks the boundary below which 90% of the data falls.

Formula: Each decile Dᵌ is found using linear interpolation at position (k ÷ 10) × (n − 1) in the sorted dataset

Deciles are commonly used to rank incomes, test scores and performance metrics into ten comparable bands, such as reporting that a value falls in the "top decile."