Use this suit size converter to convert jacket sizes between US, UK, EU, Australia, and Japan.
For a full body-measurement recommendation, try the suit size calculator.
This suit size converter helps translate suit jacket sizes between common international sizing systems. It is designed for shoppers who know one suit size and want the closest equivalent in another country or region.
The converter turns your selected size into a base US jacket size, then converts that number into the target sizing system. It also shows nearby international equivalents so you can compare US, UK, EU, Australian, and Japanese suit sizes in one result.
Suit sizing systems often use different numbers for similar jacket measurements. A US or UK size is usually close to the jacket chest measurement in inches, while EU sizing is commonly about 10 numbers higher. Japanese sizing often uses centimeter-based sizing.
Suit sizes such as 40R, 42L, or 38S include both a jacket size number and a jacket length code. S means Short, R means Regular, and L means Long. These length codes are most common in US, UK, and Australian sizing.
US and UK suit jacket sizes are often similar for the numeric size. For example, a US 40R and UK 40R may be close starting points. However, the fit can still vary by brand and cut.
A common rough conversion from US to EU suit sizing is to add 10 to the jacket size number. For example, a US 40 is often close to an EU 50, and a US 42 is often close to an EU 52.
Japanese suit sizing often relates more closely to centimeter measurements. This converter estimates the closest Japanese size by converting the base jacket size from inches to centimeters.
International suit size conversions are not exact across every retailer. A converted size should be treated as a starting point because suit fit can change based on brand, fabric, shoulder shape, jacket cut, and tailoring.
This suit size converter is useful for quick comparison, but it does not replace a brand-specific size chart. Always check the retailer’s measurements before buying, especially for slim fit, classic fit, or tailored fit suits.
Choose the sizing system you are converting from, enter the jacket size number, select the target system, and choose jacket length if the original system uses Short, Regular, or Long.
US and UK suit sizes are often similar for men’s jacket numbers, but sizing is not guaranteed to be identical. Brand fit, cut, and tailoring can still change the final fit.
A common estimate is to add 10 to the US jacket size. For example, a US 40 is often close to an EU 50. The converter uses this as a practical starting point.
A size like 40R usually means a 40 inch jacket size with a regular jacket length. The number refers to the jacket size, and the letter refers to the length.
No. Suit size conversions are approximate because different brands use different patterns, cuts, and fit styles. Use the converted result as a starting point and compare it with the brand’s own chart.
