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Trimmed Mean and Data Percentile Calculator

α-trimmed mean removes top and bottom α% of values.

Calculates the 10% trimmed mean (removes top 10% and bottom 10%) given n, overall mean, and the sum of the α-fraction values at each end. Robust to outliers.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

T_mean = (Σ all − Σ excluded) / (n × (1 − 2α))

In depth

Calculates the 10% trimmed mean (removes top 10% and bottom 10%) given n, overall mean, and the sum of the α-fraction values at each end. Robust to outliers.