Forecast Accuracy BASIC Template

DecisioTool

Forecast Accuracy BASIC Template

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Know exactly how accurate your forecasts are — and why they're missing.

Most supply chain teams track forecast accuracy as a single number. This template shows you the full picture: which SKUs are on target, which are consistently over- or under-forecasting, and where to focus your improvement efforts first.

Open it Monday morning, enter your data, and walk into your next S&OP meeting with a clear, defensible view of forecast performance.


What's Inside

  • Inputs Sheet — Enter up to 15 SKUs with Forecast Units, Actual Units, and Root Cause notes per period
  • Calculations Engine — Auto-calculates MAPE, Forecast Accuracy %, Mean Bias %, and per-SKU APE% using industry-standard formulas
  • Dashboard — One-page summary showing overall accuracy, MAPE, Mean Bias, SKUs on target count, and Best/Worst SKU identification with ✓/✗ status indicators
  • Root Cause Tracking — Log the reason behind each SKU's miss to identify systemic patterns over time

Key Metrics Calculated Automatically

  • MAPE (Mean Absolute Percentage Error) — the industry-standard measure of forecast accuracy
  • Forecast Accuracy % — expressed as 1 − MAPE for easy executive reporting
  • Mean Bias % — tells you whether you're systematically over- or under-forecasting
  • SKUs On Target — count of SKUs meeting your ≤15% APE threshold
  • Best & Worst SKU — automatically identified so you know where to focus

Who This Is For

Demand planners, supply chain analysts, S&OP leads, and operations managers who need a fast, structured way to measure and report forecast performance — without building a model from scratch.


How to Use It

  1. Download the Excel file
  2. Open in Microsoft Excel or Google Sheets
  3. Enter your reporting period, product line, and analyst name in the Inputs tab
  4. Enter your SKU codes, forecast quantities, and actual quantities
  5. Add a root cause note for any SKU that missed target
  6. View your Dashboard for a complete accuracy summary — ready to share with leadership

This is the BASIC version — free, no strings attached. It handles up to 15 SKUs for a single period. Looking for multi-period trending, more SKUs, or advanced bias analysis? The PRO version is coming soon.

Format: Microsoft Excel (.xlsx) | Compatible with Google Sheets
SKU Capacity: Up to 15 SKUs per period
Sheets: Inputs, Calculations, Dashboard

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