38 Inches in CM: Converter, Waist & Bust Size Chart

Whether you’re ordering jeans online or comparing your measurements against a European size chart, a 38-inch number shows up more often than you’d expect. The math is straightforward—multiply by 2.54 and you get 96.52 cm—but what that means for your waist, bust, or chest depends on which brand’s chart you’re reading. This guide cuts through the variation to give you the exact conversion plus a clothing-size breakdown across US, UK, and EU sizing.

38 inches equals: 96.52 cm · 1 inch equals: 2.54 cm · 40 inches equals: 101.6 cm · 42 inches equals: 106.68 cm

These conversion values are used across multiple sizing contexts in clothing retail.

How many cm is a 38 inch waist?

A 38-inch waist converts to exactly 96.52 cm. This figure comes from multiplying 38 by the international conversion factor of 2.54 centimeters per inch, established in 1959 for standardized metric measurement (Answers.com measurement database). The calculation checks out to the decimal: 38 × 2.54 = 96.52.

Conversion formula

To convert any inch measurement to centimeters, multiply the inch value by 2.54. That’s the only step:

• 38 × 2.54 = 96.52 cm
• 40 × 2.54 = 101.6 cm
• 42 × 2.54 = 106.68 cm

Waist size context

For women’s US sizing, a 38-inch waist sits at the upper end of standard misses’ sizes and crosses into plus territory. According to Grivet Outdoors sizing data (outdoor retailer with detailed size charts), US women’s Large (sizes 12-14) covers a waist of 30.5-32 inches—meaning a 38-inch waist falls 6 inches larger than a typical size L.

However, plus-size charts tell a different story. Kiyonna plus-size fitting guide (plus-size women’s retailer) places size 10-12 at 35.5-38 inches waist, and their 1X size spans 38.5-42 inches. So a 38-inch waist lands squarely in the upper range of straight sizes or the lower range of extended sizes, depending on the brand.

The implication: a 38-inch waist often corresponds to sizes 14-16 in standard women’s sizing, or 1X/0X in plus collections. Lane Bryant fit guidance advises shoppers to choose between two sizes based on fit preference—snug or relaxed—to account for this variation.

What is 38 inches in cm bust?

The same 96.52 cm figure applies to bust measurements—38 inches bust equals 96.52 centimeters. The conversion doesn’t change based on body location. However, what a 38-inch bust means for your dress size varies significantly by region and brand.

Bust measurement conversion

Per ASOS sizing reference (UK fashion retailer), a UK size 12 corresponds to a 38-inch bust in their tall sizing, which translates to 96 cm. Meanwhile, Wikipedia sizing standards documents US standard sizing where Size 20 carries a 38-inch bust. The range is wide because sizing systems differ by country and market segment.

• ASOS UK 12 (tall): 38 inches / 96 cm bust
• US Standard Size 20: 38 inches bust (per Wikipedia sizing overview)
• Edee’s Place measurement charts women’s Large: 36-38 inches bust/waist

Clothing fit implications

A 38-inch bust typically signals a larger frame size, but the gap between bust and waist matters for fit. According to Future Fusion international conversion guide (international size chart aggregator), one size bracket shows 97 cm bust with only a 72 cm waist—a 25 cm difference. That differential determines whether you need room in the shoulders versus the midsection.

What this means: retailers may list “38” as either a waist or bust measurement depending on the garment type. A pair of pants labeled “38” likely means 38-inch waist. A dress labeled “38” may mean 38-inch bust. Always verify which measurement the size refers to before ordering.

What is 40 inch in cm?

Forty inches converts to 101.6 cm using the same 2.54 multiplier. This measurement sits two inches above 38 and often appears alongside 38 in size progressions for waists, busts, and chests.

Exact 40 inch conversion

The arithmetic:

• 40 × 2.54 = 101.6 cm
• 38 × 2.54 = 96.52 cm
• The difference: 2 inches = 5.08 cm

Comparison to 38 inches

Size charts typically increment by 2-inch intervals. According to Enfield Safety measurement table (UK safety gear retailer with metric conversions), their women’s waist chart shows XL at 36-38 inches (92-96 cm) and the next size up crosses into 40+ territory. This pattern repeats across brands—38 and 40 represent consecutive standard size breaks.

For Grivet Outdoors sizing documentation men’s sizing, XXL covers 36-38 inches waist, placing 40 inches at the top of XXL or into the next size up. The catch: men’s and women’s charts don’t align. A 38-inch waist in women’s misses’ sizing sits at a different body position than a 38-inch chest in men’s outerwear.

For shoppers comparing sizes across brands, the 5.08 cm gap between 38 and 40 inches can mean the difference between a snug fit and a relaxed one—particularly in fitted styles like pencil skirts or tailored blazers.

What is 42 inch in cm?

Forty-two inches converts to 106.68 cm. Four inches above 38 and just 1.08 cm above 40, this measurement often marks the upper boundary of extended straight sizing or the start of plus categories.

42 inch to cm formula

The math is consistent:

• 42 × 2.54 = 106.68 cm
• 40 × 2.54 = 101.6 cm
• 38 × 2.54 = 96.52 cm

Size progression

According to Grivet Outdoors sizing reference, plus-size 2X spans 39-41 inches waist, meaning 42 inches sits above 2X or at the lower edge of 3X. Meanwhile, Enfield Safety conversion chart shows Euro sizes DE/BE/NL 48-50 covering 36-38 inches (92-96 cm)—placing 42 inches (106.68 cm) well beyond that European size range.

Regional variation plays a role here. Per Answers.com regional data, South African women’s size 38 has a waist around 78 cm (30.7 inches) and bust 96 cm. The same numeric “38” means different actual measurements across markets.

What this means: a 42-inch waist or bust (106.68 cm) typically requires plus sizing or extended sizes in most US and UK retailers, while European sizing may jump several numbers to accommodate the same measurement.

Is a 38 waist big for a woman?

Context matters here. A 38-inch waist is above average for adult women in the US. According to Wikipedia sizing reference, US standard misses’ sizes use even numbers from 2 to 16 based on bust girth—with waist typically running 6-8 inches smaller than bust. A woman with a 38-inch waist would likely need a size 16+ in misses’ sizing, or a size 1X-2X in plus ranges.

Average waist sizes

National health data from multiple sources suggests average adult women’s waist circumference in the US trends toward 34-38 inches, though this varies by age and body composition. A 38-inch waist falls at or slightly above the median for women overall, but at the lower end for taller or broader frames.

The pattern: in misses’ sizing (standard straight sizes for women not labeled “plus”), 38 inches exceeds the size 16 range. In plus sizing, 38 inches often sits in the middle. Kiyonna sizing documentation shows their 1X at 38.5-42 inches waist—meaning 38 inches lands at the start of their extended range.

Clothing size equivalents

Here’s how a 38-inch waist maps across systems:

Retailers often stock different size ranges across store locations, forcing shoppers to check inventory before visiting. Some brands may not carry a 38-inch waist in-store, requiring online orders or specialty retailers.

For women shopping in US retail stores, a 38-inch waist often means navigating two different size sections. Standard misses’ sizes may max out below you, while plus collections start higher. The workaround: check brand-specific size charts before visiting a store, or shop retailers known for extended straight sizing.

Conversion steps

Converting inches to centimeters requires one multiplication. Here’s the step-by-step process:

1. Identify your inch value — this could be waist, bust, chest, or any body measurement listed in inches.
2. Apply the conversion factor — multiply the inch value by 2.54 (the standardized centimeters-per-inch ratio).
3. Read your result — the product is your measurement in centimeters, exact to two decimal places.

Example calculations:

• 38 inches → 38 × 2.54 = 96.52 cm
• 40 inches → 40 × 2.54 = 101.6 cm
• 42 inches → 42 × 2.54 = 106.68 cm
• 36 inches → 36 × 2.54 = 91.44 cm

Size chart reference

Six common measurements and their centimeter equivalents, useful for reading clothing size charts:

Retailers typically use 2-inch intervals in their size progressions, so once you know 38 = 96.52 cm, you can calculate 40, 42, and beyond without a calculator.

Clarity check: What we know vs. what varies

The catch: clothing sizing has no single global standard. The 38-inch measurement (96.52 cm) is mathematically fixed, but what that means for a size label varies by manufacturer, region, and garment type. The confirmed facts above are universal; the varying information requires checking each retailer’s specific chart.

Expert perspectives

“38 inches × 2.54 cm/inch = 96.52 cm. This formula works every time for any inch-to-centimeter conversion.”— Answers.com Math Reference

“Sizing can vary between different brands and styles. Always check the specific retailer’s size chart before purchasing.”— Answers.com Sizing Guide

“US standard clothing sizes use even-numbered sizes from 2 to 16, with measurements based originally on bust girth in inches.”— Wikipedia U.S. Standard Clothing Size

For online shoppers navigating international retailers, the consistent takeaway from sizing experts: the mathematical conversion (96.52 cm for 38 inches) never changes, but the meaning of a size label shifts by brand and market. Cross-reference your actual body measurements against the retailer’s specific chart—not the size number alone.

Summary

Thirty-eight inches converts to exactly 96.52 centimeters using the 2.54 multiplication factor established in 1959. For clothing shoppers, this measurement most commonly appears in waist and bust sizing, where it falls at or above misses’ straight sizes (size 16+) and within the lower range of plus sizing (1X/0X). UK size 12 (ASOS) shows a 38-inch bust, while European sizing places 38 inches closer to size 48-50 for waist. The mathematical fact is fixed; the clothing-size interpretation varies by brand, region, and garment type. Always verify the retailer’s specific measurement chart before ordering to avoid fit surprises.