How to Measure Chest Size – Guide for Men, Women & Perfect Fit

Knowing how to measure chest size is one of the most practical skills for anyone shopping for clothing online, ordering a tailored shirt, or following a sewing pattern. A single measurement can determine whether a jacket fits across the shoulders or a dress sits comfortably. Yet many people guess incorrectly, rely on a single brand’s size label, or measure over bulky layers. This guide covers the methods that work for men and women, with and without a tape measure, and explains where common mistakes happen.

Chest measurement is not the same for every person or every garment. For men, the standard reference point is the fullest part of the chest, usually at nipple height. For women, the equivalent is the fullest part of the bust. In both cases, the tape must be level, snug, and parallel to the floor. Small variations in tape placement or posture can shift the result by an inch or more, which is enough to change a size.

This article draws on official fitting guides from menswear brands, women’s retail help centres, and tailoring resources. It also covers alternative approaches when no tape measure is available, and explains how to use an existing well-fitting garment as a reference point for online shopping.

How to Measure Chest Size for Men?

Men’s chest measurement is most commonly used for dress shirts, T-shirts, jackets, and custom tailoring. The process is straightforward when the key reference points are understood. Many men’s style guides, including those from traditional shirtmakers, emphasise the same landmarks for consistent results.

The following insights summarise what fitting sources consistently recommend:

• The most accurate method uses a soft tape measure placed at the widest part of the chest, typically at nipple height for men.
• Men measure at nipple height; women measure over the fullest part of the bust.
• The tape must be level all the way around, parallel to the floor, and snug but not tight.
• Women’s chest measurement often requires two steps: under-bust and over-bust.
• Without a tape measure, a string or belt can be used and then measured against a ruler.
• Measuring on a shirt that fits well can give a reliable chest size for ordering clothes online.
• Repeating the measurement two to three times improves overall accuracy.

Key facts drawn from official guides and tailoring practice are listed below.

The Charles Tyrwhitt fitting guide, a reference for men’s shirt sizing, states: “Wrap the tape measure round the fullest part of your chest, positioning it horizontally across your nipples.” That instruction aligns with the approach used by most tailoring brands for dress shirts and jackets. Charles Tyrwhitt Men’s Fitting Guide provides further detail on where to place the tape and how to read the result.

How to Measure Chest Size for Women?

For women, chest measurement is usually referred to as bust measurement in fitting guides and size charts. The process differs from men’s measurement because it typically involves two readings: under-bust and over-bust. Resources from women’s apparel retailers offer similar step-by-step instructions for taking both measurements.

How to measure chest size female in cm

The under-bust measurement is taken by wrapping the tape around the rib cage directly under the breast. The tape should be snug and level. The over-bust measurement is taken around the fullest part of the bust, with the tape passing across the back at the same height. Both measurements are commonly recorded in centimetres in European sizing systems.

How to measure your chest size female with tape

The New Look Help Centre advises: “Measure round your rib cage under the breast. Measure around the fullest part of your breast.” Wearing a bra that you would normally wear with the garment is recommended, as it affects the shape and position of the bust. The tape should remain straight across the back and not be pulled tight enough to compress the bust. New Look Women’s Sizing Help includes diagrams and further advice for taking both measurements accurately.

Under-bust and over-bust measurement

These two values together are used to determine bra band size (under-bust) and cup size (the difference between over-bust and under-bust). For garments such as dresses, blouses, and jackets, the over-bust measurement is the one most directly comparable to a size chart. Many sewing patterns also require both measurements to grade between sizes.

How to Measure Chest Size with a Measuring Tape?

Using a soft tailor’s tape measure is the most reliable method for both men and women. The technique is the same regardless of gender, with only the landmark point changing. Tailoring and sewing resources consistently reinforce this approach for accurate body measurement.

Where to place the tape for chest measurement

For men, the tape should pass under the armpits and across the nipples. For women, the tape should pass under the armpits and across the fullest part of the bust. In both cases, the tape must be at the same height on the front and back of the body. Letting the tape droop in the back is one of the most common errors and can add up to several centimetres to the reading.

Should the tape be snug or loose?

The tape should be snug against the skin or light clothing, but not tight enough to indent the surface. A tape that is too loose will produce a measurement larger than the true chest size. A tape that is too tight will compress tissue and produce a measurement smaller than what the garment needs for a comfortable fit. The Tommy John blog describes the process as: “Take a soft tape measure and wrap it under your armpits at the widest part of your chest.” Tommy John Chest Measurement Blog expands on this with guidance on tape tension and body position.

How to measure chest size in inches

Inches are the standard unit for US menswear and many shirt sizing systems. The tape measure is read at the point where the zero end meets the scale after wrapping it around the chest. If a size chart uses inches, the measurement should be taken in inches and not converted unless necessary. Converting between inches and centimetres introduces small rounding differences that can affect fit.

How to Measure Chest Size Without a Measuring Tape?

A tape measure is the ideal tool, but several alternatives exist when one is not available. Each alternative has trade-offs in accuracy.

How to measure chest size with hand

Using the hand as a measuring tool is the least accurate method. One approach is to stretch the hand across the chest from armpit to armpit and then measure that span with a ruler. This provides a rough estimate but is prone to error because hand span varies between individuals and the stretch is difficult to keep consistent.

How to estimate chest size using string

A piece of string, ribbon, or any non-stretch cord can be wrapped around the chest at the correct level. Mark the point where the string overlaps, then lay it flat against a ruler or any straight measuring tool. The string-and-ruler method is significantly more accurate than using a hand alone, provided the string does not stretch during the process.

Using a shirt as a reference

A shirt that fits well can be laid flat on a surface and measured from side seam to side seam, just below the armpits. Doubling that number gives the half-chest measurement, which can be compared to the garment’s flat measurements. This method is useful when ordering online from a brand whose sizing is already known.

What Are the Correct Steps for Measuring Chest Size?

Following a consistent sequence of steps reduces the chance of error and makes the result repeatable. The procedure below comes from standard fitting guidance used across tailoring and retail sources.

1. Stand straight with arms relaxed at your sides.
2. Find the widest part of your chest (nipple line for men, fullest bust for women).
3. Wrap the tape measure horizontally around the chest at that height, passing under the armpits and across the back.
4. Ensure the tape is snug against the skin or light clothing but not tight enough to compress tissue.
5. Read the measurement at the point where the end of the tape meets the scale, in either inches or centimetres.

Repeating the process two to three times and averaging the results improves accuracy. If possible, having another person assist can help keep the tape level and at the correct height.

How Does Chest Measurement Vary Between People and Methods?

Some aspects of chest measurement are well established across fitting guides, while others depend on body shape, the garment type, or the tailor’s preferred technique.

Why Does Accurate Chest Measurement Matter for Clothing Fit?

An accurate chest measurement reduces the likelihood of returns and ensures that garments fit comfortably across the torso. For shirts and jackets, the chest measurement determines how the garment sits across the back, shoulders, and armholes. A measurement that is too small will pull at the buttons or restrict arm movement. A measurement that is too large will look loose and may cause the shoulder seams to fall off the natural shoulder line.

Size charts vary significantly between brands. A size medium from one brand may correspond to a chest measurement of 38 inches, while another brand’s medium may start at 40 inches. Always checking the specific brand’s size chart against your own measurement is the only reliable way to choose a size. Body measurements alone, such as height and weight, are not a substitute. For users interested in related body measurements, the article on 163 Cm in Feet – Height Conversion, Comparison and BMI covers height conversion and comparison, while 12 Stone in Lbs – Exact Conversion and NHS Weight Chart provides context on weight measurement standards.

Chest size can also change over time with weight fluctuation, muscle gain, or changes in posture. For ongoing accuracy, it is worth remeasuring at least once a year or before ordering garments from a new brand.

What Guidance Do Official Fitting Guides Provide?

Retailers and tailoring brands publish fitting guides that explain their specific measurement conventions. These guides are among the most reliable sources because they are tied directly to the size charts used by that brand.

“Wrap the tape measure round the fullest part of your chest, positioning it horizontally across your nipples.”

— Charles Tyrwhitt fitting guide

“Measure round your rib cage under the breast. Measure around the fullest part of your breast.”

— New Look Help Centre

“Take a soft tape measure and wrap it under your armpits at the widest part of your chest.”

— Tommy John blog

Each of these sources reinforces the same core principles: the tape must be horizontal, placed at the widest point, and snug without compressing the body. The differences in wording reflect the different garment types each brand focuses on, but the underlying technique remains consistent.

What to Do After Measuring Your Chest Size?

Once the chest measurement is recorded, it should be compared to the size chart of the specific garment being considered. For women, combining the under-bust and over-bust measurements helps determine bra band and cup size. If the measurement falls between two sizes, the choice depends on the garment’s intended fit: a slim-fit garment may require the smaller size, while a regular or relaxed fit may suit the larger size. After measuring, the value can also be used for sewing pattern selection, where it is typically paired with waist, hip, and shoulder measurements to choose or grade a size.

Frequently Asked Questions