Converse Jack Purcell CP fits in the same number as Air Force 1, Air Jordan 1, Vans Authentic, adidas Superstar, adidas Stan Smith, Nike SB Dunk Low, and Nike Dunk Low — essentially every major sneaker cluster in the Feetlot database except Air Max 90, Air Max 97, and YEEZY Boost 350 V2, which run half a size larger in number. Based on 263 owner-reported pairs in the Feetlot database, the typical wearer takes the same number in Jack Purcell CP as in most sneakers. If unsure: order true to size.
Jack Purcell CP Sizing — What 263 Pairs in the Feetlot Database Tell Us
The Converse Jack Purcell CP is the most-tracked Jack Purcell variant in the Feetlot database. Across 263 owner-reported pairs, the residual variance is tight (standard deviation ≈ 0.25 size units). The notable finding: Jack Purcell CP sits at offset +0.041 — right between AF1 (0.000) and AJ1 (+0.217). This means it rounds to the same size as both AF1 AND AJ1 in 0.5 increments, giving it the broadest "same" coverage of almost any shoe in the database. Only Air Max 90 (+0.314), AM97 (+0.396), AM95 (+0.388), AM1 (+0.307), and YEEZY 350 V2 (+0.476) push past the half-step threshold above Jack Purcell CP.
The Jack Purcell CP uses a canvas or leather upper on a vulcanized cupsole — the same general construction as Chuck Taylor Ox. The slight positive offset (+0.041 vs Chuck Ox's ~-0.202) means Jack Purcell CP sits about a quarter size above core Chuck in the raw model, which rounds to "same" at 0.5 increments. Effectively, Jack Purcell CP and Chuck Taylor Ox are interchangeable in size for most wearers.
Should You Size Up or Down in Jack Purcell CP?
Standard fit — coming from AF1, AJ1, Vans, Superstar, or Dunk (most people)
Order true to size. AF1, Air Jordan 1, Vans Authentic, adidas Superstar, Stan Smith, SB Dunk Low, Dunk Low, Dunk High, Nike Blazer Mid '77, and Sperry Authentic Original all sit in the same bucket as Jack Purcell CP. No adjustment needed from any of these — same number.
Coming from Air Max 90, Air Max 97, or YEEZY 350 V2
Size down half. AM90 (+0.272 delta), AM97 (+0.355 delta), AM1 (+0.266 delta), AM95 (+0.372 delta), and YEEZY 350 V2 (+0.435 delta) all push above Jack Purcell CP. If you wear AM90 in 10, take Jack Purcell CP in 9.5.
Wide feet
Size up half. The Jack Purcell CP uses a medium-width cupsole last — similar to core Chuck. Wide feet report the same forefoot constraints as Chuck Taylor.
Narrow feet
True to size works well. The low-profile last suits narrow feet without extra adjustment.
Jack Purcell CP vs Chuck Taylor Ox
Both use vulcanized construction. In the Feetlot offset model, Jack Purcell CP (+0.041) is about a quarter size above Chuck Ox (~-0.202) by raw offset — but this rounds to "same" at 0.5 increments. In practice: same number in both.
How Jack Purcell CP Compares to Other Sneakers
The Converse Jack Purcell CP fits at the same numerical size as Nike Air Force 1, Air Jordan 1, Air Jordan 4, Nike SB Dunk Low, Nike Dunk Low, Nike Dunk High, Nike Blazer Mid '77, adidas Superstar, adidas Stan Smith, adidas Gazelle, Vans Authentic, Vans Old Skool, New Balance 574, Converse Chuck Taylor Ox, Converse Chuck Taylor Hi, Sperry Authentic Original, and Balenciaga Triple S. According to Feetlot data, all of these round to the same size in 0.5 increments.
The shoes that run larger in number than Jack Purcell CP (size down half): Nike Air Max 90, Air Max 97, Air Max 1, Air Max 95, adidas YEEZY Boost 350 V2, adidas YEEZY Boost 380, adidas YEEZY 700 V3. If you wear AM90 in 10, take Jack Purcell CP in 9.5.
The shoes that run smaller in number: Clarks Desert Boot and Red Wing Iron Ranger both run half a size smaller than Jack Purcell CP. If you wear Jack Purcell CP in 10, take Desert Boot or Iron Ranger in 10.5.
Sign in to Feetlot and add a few of your other sneakers to get a personal Jack Purcell CP size recommendation calibrated to your actual foot.
Converse Jack Purcell CP Size Chart (US / EU / UK)
| US Men's | US Women's | UK | EU |
|---|---|---|---|
| 4 | 6 | 3.5 | 36.5 |
| 5 | 7 | 4.5 | 37.5 |
| 6 | 8 | 5.5 | 39 |
| 7 | 9 | 6.5 | 40.5 |
| 7.5 | 9.5 | 7 | 41 |
| 8 | 10 | 7.5 | 41.5 |
| 8.5 | 10.5 | 8 | 42 |
| 9 | 11 | 8.5 | 42.5 |
| 9.5 | 11.5 | 9 | 43 |
| 10 | 12 | 9.5 | 44 |
| 10.5 | 12.5 | 10 | 44.5 |
| 11 | 13 | 10.5 | 45 |
| 12 | 14 | 11.5 | 46.5 |
Common Sizing Mistakes
- Sizing down based on AM90 experience. AM90 runs about half a size larger in number than Jack Purcell CP. If you wear AM90 in 10, take Jack Purcell CP in 9.5 — don't stay at 10.
- Assuming YEEZY 350 sizing translates directly. YEEZY 350 V2 runs about half a size above Jack Purcell CP. If you wear YEEZY 350 in 10, take Jack Purcell CP in 9.5.
- Overthinking the Converse-to-Nike crossover. Unlike Chuck Taylor Ox (which runs half below AF1), Jack Purcell CP rounds to the same size as AF1, AJ1, and Dunk — no adjustment needed from those.
- Using Chuck Taylor as a reference and expecting a different size. Chuck Ox and Jack Purcell CP round to the same size in 0.5 increments in the Feetlot model. Same number in both.
How Feetlot Computes These Numbers
Every Jack Purcell CP sizing recommendation on Feetlot is the output of a global offset model fit to over 100,000 owner-reported shoe records. Each shoe gets a single number — its "size offset" — that captures how its sizing drifts relative to a reference shoe (the Nike Air Force 1). The result: sizing advice that holds up no matter how unusual a wardrobe is.