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Demand Forecast Accuracy (MAPE/MAD/Bias) Calculator

Format: Excel file (.xlsx)Free
The Problem

Most teams only have a gut sense their forecast was 'roughly right,' without actually measuring the error size or whether there's a systematic pattern like consistent under-forecasting.

Track demand forecast accuracy over time with three complementary metrics: MAPE, MAD, and Bias.

Features
  • Automatic error, absolute error, and % error per period
  • MAD, MAPE, and Bias summary at the bottom of the table
  • Extendable to any number of periods
Who It's For

Demand planners and S&OP analysts

Related Domain: Demand & Inventory Optimization