Grabbing footwear built on a male last and matching it for a female foot is not a one-to-one swap. US labels sit on different molds, so the printed number alone can mislead you. A simple formula, a clear size chart, and a quick width check usually get you closer to a perfect fit and the right size.
This guide covers the +1.5 to +2 rule, a US table, brand notes for major makers, how measurement matters, and the quick size conversions shoppers ask about most — no fancy calculator required. If you sell on Shopify, a product-page guide helps customers choose without guessing.
Why the numbers do not match
A shoe is shaped on a last that sets length, width, and volume. Male lasts tend to run wider through the midfoot. Female lasts are often narrower at the back of the foot and more tapered in the forefoot. Same digit, different fit — so you still need to convert before you order.
The formula that works for most US pairs
The practical rule for US sizing:
Women’s size ≈ men’s size + 1.5 to +2
Athletic models often sit near the lower bump. Canvas and some lifestyle styles lean toward +2. When you land between options, start smaller, then go up if the pair runs long.
US 6 (M) → 7.5 (W)
US 7 (M) → 8.5 (W)
US 8 (M) → 9.5 (W)
US 9 (M) → 10.5 (W)
Those examples use 1.5 sizes. With +2, US 7 (M) maps to 9 (W) and US 8 (M) maps to 10 (W).
US men-to-women shoe size chart
The table below follows the half-to-two-size pattern many US makers use for sneakers and a typical running shoe. If a model runs large, try a half size down after you convert.
US (M) | US (W) | Approx. foot length (cm) |
|---|---|---|
5 | 6.5 | 23.5 |
6 | 7.5 | 24.5 |
7 | 8.5 | 25.5 |
8 | 9.5 | 26.5 |
9 | 10.5 | 27.5 |
10 | 11.5 | 28.5 |
11 | 12.5 | 29.5 |
12 | 13.5 | 30.5 |
Centimeter length often beats chasing a label alone. Measure both feet, use the longer one, and match that length of the foot before buying shoes. For international sizing or UK sizes, rely on length first — numbers shift across regions.
Brand notes: Nike, Adidas, Converse
Brand-specific lasts vary slightly, so the same math can feel different on your foot.
Nike — Often a touch narrow; many shoppers use the +1.5 path (US 8 → 9.5).
Adidas — Some lifestyle models feel roomy; start with the same bump and drop a half size if the back of the foot floats.
Converse — Chuck Taylors are frequently sold unisex with a clear pairing; +2 is common.
New Balance and Puma follow the same broad US math. Width options (especially on New Balance) can matter more than the half-size tweak — skim each product’s size chart to find what that model recommends.
Width and how to measure
US width letters differ by gender. On male pairs, D is usually standard; on female pairs, B is standard and D is wide. A wide forefoot often prefers the roomier last after you convert.
If length looks right but the heel slips, try width, a thicker insole, or a lace lock before jumping a full size larger.
Stand with your heel against a wall on paper.
Mark the longest toe; measure heel-to-toe in cm.
Use the longer foot length; apply the formula; adjust for brand and width.
Common quick pairings
US 5.5 (M) ≈ 7 (W)
US 7 (M) ≈ 8.5–9 (W)
US 8 (M) ≈ 9.5–10 (W)
US 9 (M) ≈ 10.5–11 (W)
US 10 (M) ≈ 11.5–12 (W)
Reverse checks matter too: a women’s 9 is roughly a men’s 7–7.5, and a women’s 7 is roughly a men’s 5–5.5 — not a men’s 7. Same digit, different shoe.
For Shopify merchants
A clear on-page size chart cuts returns when shoppers need help picking without leaving the product. DEVNZO Size Chart & Size Guide adds charts per product or collection; browse more tools from Apps by Devnzo if you want a fuller sizing setup.
FAQ: frequently asked questions
What is women’s size 9 in men’s?
About US 7 to 7.5 (M), depending on the formula.
Is men’s 5.5 the same as women’s 7?
Usually yes under the half-size rule. Confirm with foot length if the brand runs long.
What size is 7 in female to male?
Women’s 7 is roughly US 5–5.5 (M) — not US 7 (M).
Is a women’s 7 a men’s 7?
No. Always convert before you order.
Do Adidas models use the same rule as other big brands?
Most sit near the same bump, but some Adidas models feel larger while narrower lasts feel tighter. Trust the model guide when they disagree.
Conclusion
Men’s to women’s shoe size conversion is mostly add one-and-a-half to two sizes, then check width and brand fit. Use a size conversion chart for speed, lean on foot length when numbers conflict, and you will find the right fit more often — whether you shop for yourself, compare mens and womens labels, or help customers pick a women’s shoe size on your store.
