M&S Bra Size Charts (UK)

A comprehensive guide to help you find the right fit for every M&S bra style.

1. Dual-Size Bras

Placeholder image of the M&S Dual-Size Bra Chart

Dual-Size Bra Chart

Dual-size bras group similar band and cup measurements into a single, flexible fit (e.g., S, M, L). They are popular for everyday comfort, offering a convenient way to accommodate a range of bust sizes.

Step 1: Measure your bust with a soft tape at its fullest point. Ensure the tape is level and snug.

Step 2: Record your measurement in inches or centimeters. Refer to the corresponding "Inch" or "Cms" row on the chart.

Step 3: Identify your size category: Small, Medium, Large, or X-Large. For example, 37½ inches fits in the Medium range (36¼ - 38 inches).

Placeholder image showing how to locate your measurement in the chart

Step 4: If your measurement falls between ranges (e.g., 35 inches), choose a smaller size for a firmer fit or a larger size for a relaxed fit.

Placeholder image demonstrating how to identify your size category

Step 5: If your measurement significantly exceeds the chart’s upper limit—for example, if you measure 49 inches when the maximum is 47½ inches—consider custom fitting, as even the X-Large option may be too snug.

Placeholder image for selecting the appropriate size when measurements fall between ranges

These expert-approved steps follow industry standards. For optimal fit, consult a professional fitter or try the bra in-store.

2. Nursing Bras

Nursing bras offer practical features for new mothers, including easy feeding access and gentle support. M&S provides a specific chart to cover different band and cup sizes for nursing needs.

Placeholder image of the M&S Nursing Bra Size Chart

Nursing Bra Size Chart

Step 1: Measure under your bust for the band size and around the fullest part for the cup size.

Step 2: Match these measurements to the rows and columns in the chart (EU/FR/UK conversions).

Step 3: Identify the correct band and cup combination (e.g., S, M, L, XL, etc.) based on your measurements.

Need Additional Assistance?

Use our online calculator to confirm your size, or visit an M&S store for a professional fitting.

Calculate Your Bra Size

By Sarah on 3/29/2025