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
where:
- 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.