Data & Analytics
RMSE (Root Mean Squared Error)
Also known as:
Root Mean Squared Error
RMSD
Updated: 2/12/2026
The square root of MSE – has the same unit as the target variable.
Quick Summary
RMSE = √MSE – the most interpretable regression metric in the unit of the target variable.
Explanation
RMSE = √(MSE). In Euro prediction: RMSE=50 means "typical error ~€50".
Marketing Relevance
RMSE is the most widely used regression metric – interpretable in the unit of the target variable.
Common Pitfalls
Not robust to outliers. Scale-dependent.
Origin & History
RMSE is a natural derivation of MSE and has been in use since the 19th century.
Comparisons & Differences
RMSE (Root Mean Squared Error) vs. MAE
RMSE penalizes large errors more; MAE treats all errors equally.