COMPLETE ANSWER · FUNDAMENTALS

How do Walmart weeks work? WM weeks, quarters, and the 53-week year

Walmart supplier weeks run Saturday to Friday with a 4-5-4 month pattern. Learn the fiscal-year boundary, WMYYWW and Scintilla labels, and a worked conversion.

By Matt Drake, practicing retail advisor ·

DIRECT ANSWER

Walmart supplier reporting uses a 4-5-4 month pattern: weeks run Saturday through Friday, the fiscal year ends on the last Friday of January, and the WMYYWW code names fiscal year and week, so WM27W14 is fiscal 2027, week 14 (May 2 to 8, 2026). As of September 2026, FY27 runs January 31, 2026 to January 29, 2027.

Walmart supplier reporting uses Saturday-through-Friday weeks arranged into 4-5-4 months. Its year boundaries need the Walmart calendar; shifting an NRF calendar by a day can put the extra week in the wrong year. The fiscal year ends on the last Friday of January and the next one begins the following Saturday, so fiscal 2027 (FY27) runs Saturday, January 31, 2026 through Friday, January 29, 2027. Weeks are numbered from the start of the fiscal year and written in the WMYYWW format: WM27W14 means fiscal year 2027, week 14. Nearly every supplier-facing surface (scorecards, reporting dashboards, and week-keyed reports) keeps time in these weeks, not calendar weeks.

What does the WMYYWW format mean?

WMYYWW breaks apart as WM, a two-digit fiscal year, then W and a two-digit week number. WM27W14 is week 14 of Walmart fiscal 2027, which runs Saturday, May 2 through Friday, May 8, 2026. The count starts at W01 on the fiscal year’s opening Saturday and runs Saturday to Friday from there.

The trap sits in the year label. Because FY27 opens on January 31, 2026, almost all of fiscal 2027 happens during calendar 2026. A report stamped WM27 is not describing calendar 2027; it is describing the fiscal year that ends in early 2027. Scintilla’s numeric week code runs the other way: it numbers the year by its starting calendar year, so the same week reads 202614 there, and January weeks continue the prior year’s count. When Walmart data refuses to tie to systems keyed on calendar months, the year label is one of the first places to look.

When does Walmart’s fiscal year start and end?

The fiscal year ends on the last Friday of January, and the next fiscal year begins the Saturday after it. FY27 runs January 31, 2026 through January 29, 2027; FY28 begins Saturday, January 30, 2027. The rule bites when the Friday nearest the 31st falls in February: FY24 closed on January 26, 2024, a 52-week period ended that day in the fourth-quarter FY24 release, and the extra week went into FY25 instead.

One nuance worth filing: Walmart Inc.’s corporate financial year, the one in the 10-K and earnings releases, ends exactly on January 31 every year, and the fourth-quarter FY26 release shows both clocks at once, comparable sales through Friday, January 30, 2026 beside a corporate year through January 31, 2026. The week calendar is the structure suppliers actually work in; the two share the FY label and end within days of each other, close enough to ignore day to day and just far enough apart to matter when reconciling against Walmart’s financial filings.

How do Walmart quarters map to calendar months?

Approximately: Q1 is February through April, Q2 is May through July, Q3 is August through October, and Q4 is November through January. The 4-5-4 in the name is the NRF’s fiscal-month pattern: a four-week month, a five-week month, then a four-week month, so each quarter is thirteen weeks. In a 53-week year the extra week lands in Q4, which is why the fourth-quarter FY25 comparable sales cover a 14-week period ended January 31, 2025.

The placement of Q4 is the point. It holds Thanksgiving, Christmas, and New Year in a single quarter, which makes it the largest selling quarter, and explains why pre-Q4 planning conversations with buyers typically happen in July, at the end of Q2, months before the season itself.

How do I convert a calendar date to a Walmart week by hand?

Find the Saturday that opened the fiscal year, count the days elapsed since it, divide by seven, and add one. The full conversion for October 15, 2026:

  1. Place the date in a fiscal year. October 15, 2026 falls on or after January 31, 2026 and before January 30, 2027, so it belongs to FY27.
  2. Find the W01 anchor. FY27’s first week began Saturday, January 31, 2026.
  3. Count days elapsed. From January 31 to October 15, 2026 is 257 days.
  4. Divide by seven. 257 ÷ 7 = 36 remainder 5. Thirty-six full weeks have finished, so the date sits in week 37.
  5. Write it out. October 15, 2026 is WM27W37, the week running Saturday, October 10 through Friday, October 16, 2026.

The cross-check: the week’s opening Saturday should be the anchor plus 36 × 7 days, which lands on October 10, 2026, a Saturday, as it must be. A week that opens on any day other than Saturday means the anchor is off. The free Walmart week converter runs this same calculation in both directions: date to WM week, or WM week to its Saturday-to-Friday date range. The full week-by-week table for FY2026 through FY2028 is on the Walmart fiscal calendar page.

Why does “week 47” almost never mean calendar week 47?

In a Walmart context, an unqualified week number is read as a Walmart fiscal week. When a buyer says “let’s hit it by week 47,” they mean the WM week, and the gap from the calendar week of the same number is large: calendar week 47 of 2026 falls in mid-November, while WM27W47 runs December 19 through 25, 2026, which is Christmas week. The two readings sit roughly five weeks apart: the week before Thanksgiving versus Christmas week.

The ambiguity only appears where Walmart weeks meet calendar-keyed systems, and the full WMYYWW form removes it downstream.

What is a 53-week year and why does it matter?

Fifty-two weeks cover 364 days, so a fifty-third week is inserted every five to six years to absorb the drift. Walmart’s most recent one was FY25, which ran January 27, 2024 through January 31, 2025; the one before it was FY20, which the fourth-quarter FY20 release reports as a 53-week period ended January 31, 2020. The extra week lands at the end of the fiscal year, and the following year’s year-over-year comparisons carry a one-week offset unless the comparison is restated. Walmart’s placement is not the NRF’s: the NRF calendar lists 2006, 2012, 2017, and 2023 as its 53-week years, and NRF 2023 covers the same months as Walmart’s 52-week FY24, so a generic 4-5-4 table puts the insert a year early.

The FY25 earnings presentation distinguishes originally reported periods from equal-length comparison bases. The comp week finder simply pairs the same week number in consecutive years. Scintilla’s LY calculations normally use a 364-day offset, with an adjustment after a 53-week year. For example, FY26 W01 starts February 1, 2025: the same-numbered FY25 W01 begins January 27, 2024, but going back 364 days lands on FY25 W02, February 3, 2024. Confirm the report’s comparison basis before using a calendar pair as its LY value.

A related structural point: the calendar year-end always lands deep inside the fiscal year, never at the W01 boundary. December 31, 2024 fell in WM25W49, and calendar 2025 began mid-week inside that same WM25W49. Event weeks also move year to year even without an insert (Thanksgiving and Easter float), so a holiday’s week number is a property of that year’s W01 anchor, not of the holiday; last year’s number does not carry over.

What do you do with a WM week once you have it?

The conversion is the easy half; the converter handles it. The hard half is what a WM week implies mid-task: which scorecard week a late shipment counts against, which fiscal year’s OTIF invoicing schedule governs a deduction (Walmart publishes that schedule per fiscal year), whether the reset week a buyer quoted came from this year’s anchor or last year’s. Retail Reason can help work through those follow-up questions. Chat displays the guidance verification date when available; a connected guidance response includes its as-of date and confidence class. Learn how to request a plan check for calendar assumptions, or see pricing.

What are the limits of this answer?

The year boundaries above are the ones Walmart has published through FY26, plus the FY27 and FY28 anchors that follow from the same last-Friday rule; a future year can be restated, so confirm any money-adjacent week in the fiscal calendar that Retail Link or Scintilla displays before you invoice, forecast, or schedule on it. The Scintilla week-code convention is current as of May 2026, and quarter-to-month mappings are approximate by design. Last verified September 6, 2026.

Retail Reason is an independent service. It is not affiliated with, sponsored by, or certified by Walmart Inc. It does not connect to Retail Link or Scintilla and holds no credentials; it reasons from the calendar rule and the context you provide. See the full service limitations.

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