How to Measure Your Bra Size at Home in 5 Simple Steps

Quick Answer

Measure your band size snugly around your ribcage directly under your bust, then measure your bust at the fullest point. Subtract the band measurement from the bust measurement: each inch of difference equals one cup size. Re-measure twice to confirm, and treat the result as a starting point, not a final verdict.

A bra that fits well should feel supportive without digging in, and the numbers on the tag are only useful if they match your actual measurements. Learning how to measure bra size at home takes about ten minutes and a soft tape measure, and it gives you a reliable starting point before you order anything online.

This bra size measurement guide walks through five steps in order, with the checkpoint that matters at each stage. You will measure band size, measure cup size, and finish with a fit check that catches the mistakes a tape measure alone cannot.

Before You Start: What You Need

You need a soft measuring tape, a mirror, and a bra that is not padded or molded if you have one. Wear the least bulky bra you own, or go without if that is comfortable. A padded or push-up bra adds volume that will throw off your bust measurement, so save it for later.

Stand in front of a mirror so you can keep the tape level all the way around your body. A tape that dips at the back is one of the most common reasons a home measurement comes out wrong. If you do not have a soft tape, use a piece of string and measure it against a ruler afterward.

• Keep the tape parallel to the floor at every step.
• Measure in inches unless the brand's size chart uses centimeters.
• Write each number down as you go so you can compare them.

Why Measuring at Home Beats Guessing

Most people wear a band that is too loose and a cup that is too small, because a loose band feels comfortable at first and a smaller cup feels supportive. Measuring at home replaces that guesswork with two numbers you can check against any brand's size chart before you buy.

It also helps you shop more confidently online. When you know your band and cup measurements, you can compare them directly to the fit notes on a product page instead of ordering three sizes and returning two. The steps below are the same ones a fitter would use, just without the fitting room.

• Re-measure every six months or after any significant weight change.
• Different brands cut differently, so always check the specific size chart.
• A measurement is a starting point, not a guarantee.

Reading Your Result and Choosing a Style

Once you have a band and cup number, the style you choose matters as much as the size. A soft, wire-free bralette like the Ribbed Bralette - Thin Straps uses ribbed microfibre with lightweight stretch, thin adjustable straps, and removable cups for flexible shaping, which makes it a forgiving option if you are between sizes. The Bralette - Twin Straps takes a similar approach with soft microfibre, removable cups, and light support suited to lounging or layering.

If you want more structure, the Lace Balconette Bra uses delicate lace cups, a half-cup silhouette, and underwire construction for gentle lift, with unlined cups that stay lightweight. The Lace Longline Bra takes a different route with a longline mini-corset band, lace triangle cups, and a wire-free design for soft comfort. Match the construction to the support you actually want, not just the size on the tag.

• Wire-free styles suit lighter support and everyday comfort.
• Underwire styles suit shaping and a more defined silhouette.
• Check the fit tip on each product page before ordering.

Your 5-Step Bra Size Measurement Routine

1. Step 1: Measure your band size: Wrap the tape snugly around your ribcage, directly under your bust, keeping it level with the floor. Exhale normally and read the number where the tape meets. If the number is even, that is your band size; if it is odd, round up to the next even number. Checkpoint: the tape should feel snug but not tight enough to leave a mark.
2. Step 2: Measure your bust size: Wrap the tape around the fullest part of your bust, usually across the nipple line, without compressing the tissue. Keep the tape level and parallel to the floor all the way around. Stand straight and let your arms rest at your sides for the reading. Checkpoint: if the tape slips down at the back, the number will read too small.
3. Step 3: Calculate your cup size: Subtract your band measurement from your bust measurement. Each inch of difference equals one cup size: 1 inch is an A, 2 inches is a B, 3 inches is a C, and so on. If the difference is less than 1 inch, you may need a smaller band rather than a smaller cup. Checkpoint: a difference of 0 or a negative number usually means the band measurement was taken too loosely.
4. Step 4: Repeat both measurements: Measure your band and bust a second time, and a third if the first two readings differ. Take the average of the band measurements and the average of the bust measurements, then recalculate the cup difference. Consistency between readings is a sign the tape stayed level. Checkpoint: readings that vary by more than half an inch mean you should slow down and re-level the tape.
5. Step 5: Do a real-world fit check: Try on a bra in your calculated size and check three things: the band sits level and stays put when you lift your arms, the center front lies flat against your sternum, and the cups contain your breast tissue without spilling or gaping. Adjust the straps and hook position before deciding the size is wrong. Checkpoint: if the band rides up, go down a band size; if the cups spill, go up a cup size.

Products That Work With Your Measurements

• Ribbed Bralette - Thin Straps: Ribbed microfibre fabric with lightweight stretch, thin adjustable straps, and removable cups for flexible shaping. The adjustable straps and removable cups let you fine-tune the fit, which helps if your measurement lands between two sizes.
• Lace Balconette Bra: Half-cup silhouette with underwire construction, unlined lace cups, and a choice of cup size. Because you can select a cup size, this style rewards an accurate cup measurement more than a one-size bralette does.
• Lace Longline Bra: Longline mini-corset band with delicate lace triangle cups, wire-free design, and adjustable straps. The deeper band spreads pressure across the ribcage, which can feel more comfortable if a standard band tends to dig in.

Measure twice, write the numbers down, and treat the result as a starting point you can refine with a real try-on. A soft tape and ten minutes at home will get you closer to a comfortable fit than guessing ever will.