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Data & Insights

Walmart Forecasting:
What Vendors Need to Know

A practical guide to Walmart and Sam’s Club forecasting, why it matters, and how OCM helps suppliers stay prepared.

Updated: May 2025

Understanding Walmart Forecasts

Forecasts help predict seasonality, promotional demand, and other business trends. For Walmart and Sam’s Club suppliers, this predictive modeling is supported through the Global Replenishment Solutions System (GRS). This system archives sales data for up to two years, helping form the foundation for forecast planning.

Why Forecasts Matter to Vendors

Forecasts play an important role for suppliers working with Walmart and Sam’s Club. They help guide production quantities, timing, and frequencies so products can stay in stock and available when needed.

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Well-informed forecasting can also help vendors better manage costs and improve sales potential. Factors such as labor, raw material procurement, manufacturing, and transportation can all be influenced by forecast planning.

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For Walmart and Sam’s Club, a well-calibrated forecast helps create better alignment between vendors and internal teams, supporting the shared goal of strong in-stock performance.

Key Times When Forecasting Matters

Forecasting becomes especially important during:

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  • New product launches

  • Modular transitions or updates

  • Upcoming promotions, featured items, or holiday periods

  • Assortment item selection

  • Item deletions or discontinued ordering

  • Routine weekly orders

Key Insights and Guidelines

Within Walmart and Sam’s Club systems, the Supply Plan reflects anticipated supplier orders, while the Demand Forecast reflects projected customer sales.

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It is important to understand that these forecasts are directional tools. They are helpful for planning, but they are not guarantees of sales or orders. Because of that, decisions related to equipment, raw materials, or staffing should be made with care and should not place responsibility on Walmart or Sam’s Club if actual outcomes differ from forecasted expectations.

How OCM Supports Your Forecasting Strategy

OCM helps vendors interpret forecasting data on an ongoing basis so it becomes more useful and easier to act on. We use tools such as pivot tables and charts to turn complex forecasting data into a clearer, more vendor-friendly format.

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We also stay in communication with Walmart and Sam’s Club merchant teams to help suppliers prepare for product launches, seasonal changes, promotional activity, and other shifts that may affect demand.

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