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Mean Absolute Percentage Error Calculator

The mean absolute percentage error (MAPE) or mean absolute percentage deviation (MAPD) is a metric used in regression analysis to measure the accuracy of a forecast system as a percentage.

MAPE = (1/n) *( Σ|Pi – Oi| / Oi ) * 100


  • Σ = Sum over all considered values
  • Pi = ith Predicted or forecast value
  • Oi = ith Observed value
  • n = sample size

You can use the MAPE calculator below by entering a list of observed and predicted values in the boxes below, then click Calculate MAPE.