Demand Forecasting Statistics 2026
Forecast accuracy benchmarks, AI adoption, ROI data, and forecasting challenges for ecommerce in 2026.
TL;DR
- 18 statistics across 5 categories, all source-cited.
- Sourced from 12 named research outlets including 8fig / DAVAN Strategic, Accenture "Next stop, next-gen", AlixPartners / US Bureau of Labor Statistics, AlixPartners 2024 Consumer Sentiment Index, Forthcast platform classification.
- Updated August 2026 — refreshed quarterly.
- Forecast accuracy benchmarks, AI adoption, ROI data, and forecasting challenges for ecommerce in 2026.
Stockouts & Lost Sales
What running out actually costs.
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Two-thirds (66%) of consumers will leave and buy from another retailer when an item is out of stock.Source: AlixPartners 2024 Consumer Sentiment Index · 2024
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In a study of 524 Amazon/Shopify products, 51% experienced at least one stockout period.Source: 8fig / DAVAN Strategic · 2024
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Products that stocked out were unavailable for an average of 35 days per year.Source: 8fig / DAVAN Strategic · 2024
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US consumer-reported food out-of-stock rates fell to 9.5% in 2024, down from 12.3% in 2023.
Excess Inventory & Carrying Cost
The hidden tax of carrying too much.
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Excess stock now averages 38% of SMB inventory.Source: Netstock 2024 Inventory Management Benchmark Report · 2024
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Nearly 80% of SMBs suffer from a combination of poor forward planning and being overstocked.Source: Netstock 2024 Inventory Management Benchmark Report · 2024
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US retailers' average days of inventory on hand rose 12% since 2021, while warehouse labor rates rose 13%.Source: AlixPartners / US Bureau of Labor Statistics · 2024
Forecast Accuracy & Demand Sensing
How much accuracy lifts inventory outcomes.
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Demand sensing reduced forecast error by about one-third versus traditional methods through the pandemic.Source: e2open 2024 Forecasting and Inventory Benchmark Study · 2024
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Pairing multi-echelon optimization with demand sensing cut safety stock by 40-50%.Source: e2open 2024 Forecasting and Inventory Benchmark Study · 2024
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AI-driven forecasting can reduce forecast errors 20-50% and cut lost sales from unavailability up to 65%.Source: McKinsey & Company · 2022
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72% of SMBs cite lead-time variability as their top inventory-planning challenge.Source: Netstock 2024 Inventory Management Benchmark Report · 2024
Planning Software Adoption & ROI
Where planning maturity pays off.
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Two-thirds of companies have initiated advanced planning & scheduling (APS) systems, but only 10% have fully deployed them.Source: McKinsey 2024 Supply Chain Risk Survey · 2024
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The most supply-chain-mature companies achieved 23% higher profit margins (11.8% vs 9.6%) over 2019-2023.Source: Accenture "Next stop, next-gen" · 2024
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Supply-chain leaders are 6x more likely to use AI/gen-AI widely — yet only 9% of all companies have.Source: Accenture "Next stop, next-gen" · 2024
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Gartner predicts 70% of large organizations will adopt AI-based supply-chain forecasting by 2030.Source: Gartner · 2025
Forthcast platform data and classifications
First-party event data and explicitly labelled model classifications from the retained Forthcast panel — free to cite with the stated limits.
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Among 21 active non-test stores with at least 10 tracked SKUs, the median Forthcast-classified no-demand-or-excess share was 69.9% (middle half: 58.8%–80.5%). This is a model classification, not an observed outcome or all-Shopify estimate.Source: Forthcast platform classification · 2026
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Across 3,602 completed, directly detected post-install stockout episodes in 23 retained non-test stores, the median resolution was 6 days, p90 was 40 days, and 12.7% lasted longer than 30 days.Source: Forthcast platform data (observed) · 2026
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Within that completed stockout cohort, 2,795 episodes were detected by scheduled inventory scan and 807 by Shopify inventory webhook; open episodes were excluded from duration.Source: Forthcast platform data (observed) · 2026
Frequently asked questions
What are the latest stockouts & lost sales statistics for 2026?
Two-thirds (66%) of consumers will leave and buy from another retailer when an item is out of stock. (Source: AlixPartners 2024 Consumer Sentiment Index, 2024.)
What are the latest excess inventory & carrying cost statistics for 2026?
Excess stock now averages 38% of SMB inventory. (Source: Netstock 2024 Inventory Management Benchmark Report, 2024.)
What are the latest forecast accuracy & demand sensing statistics for 2026?
Demand sensing reduced forecast error by about one-third versus traditional methods through the pandemic. (Source: e2open 2024 Forecasting and Inventory Benchmark Study, 2024.)
What are the latest planning software adoption & roi statistics for 2026?
Two-thirds of companies have initiated advanced planning & scheduling (APS) systems, but only 10% have fully deployed them. (Source: McKinsey 2024 Supply Chain Risk Survey, 2024.)
What are the latest forthcast platform data and classifications statistics for 2026?
Among 21 active non-test stores with at least 10 tracked SKUs, the median Forthcast-classified no-demand-or-excess share was 69.9% (middle half: 58.8%–80.5%). This is a model classification, not an observed outcome or all-Shopify estimate. (Source: Forthcast platform classification, 2026.)
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