Chest Binder Size Guide — Find Your Safe, Comfortable, Affirming Fit

Binding should never hurt.
This guide helps you measure with confidence—so you can move freely, breathe deeply, and feel seen.

Non-binary person with a radiant smile and tousled dark curls wearing a black TOMSCOUT chest binder, standing in a sun-drenched room filled with lush houseplants. Sunlight highlights their confident, gender-affirming presence, showcasing the breathable comfort and sleek fit of TOMSCOUT's binder—ideal for daily wear and authentic self-expression.
Non-binary person with a radiant smile and tousled dark curls wearing a black TOMSCOUT chest binder, standing in a sun-drenched room filled with lush houseplants. Sunlight highlights their confident, gender-affirming presence, showcasing the breathable comfort and sleek fit of TOMSCOUT's binder—ideal for daily wear and authentic self-expression.

The Right Fit Changes Everything

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Safe Fit

Safe compression that protects.
Flexible support that moves with you.

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All-Day Comfort

Move freely. Breathe easily.
Comfort that lasts all day.

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Stress-Free Sizing

Just a few quick measurements.
No guesswork, no stress.

Illustrated front-facing chest diagram showing how to measure top bust and underbust, with dashed red lines and labels—TOMSCOUT’s visual guide for trans men, non-binary, and gender-diverse folks seeking an accurate chest binder fit.
FTM-presenting person in a black tank with red dashed lines across the chest and underbust—demonstrating how to take binder measurements while wearing a shirt, making the TOMSCOUT fit process inclusive and accessible.

How to Measure Your Chest

Two simple numbers help us find your safest, most affirming fit—tailored just for your body.

Measure Your Top Bust

Wrap a soft measuring tape snugly around the fullest part of your chest—across the nipples and under your arms.
For the most accurate result, measure against bare skin.

Know Your Weight

Enter your current weight to receive a safe, personalized size recommendation—based on your unique body composition.
This helps ensure your fit is both supportive and comfortable.

How to measure top bust and under bust

No tape? Use a string and a ruler.
Wrap gently—your comfort always comes first.

Not Sure Which Binder’s Right for You?

Take our quick fit quiz — it’s fast, safe, and built for gender-diverse bodies.

✅ Privacy-safe. No login. 100% guidance.

Take the Fit Quiz →

Takes less than 60 seconds

Find Your Best Binder Fit
In Seconds

Enter your top bust and current weight. We'll recommend your safest, most affirming size — personalized to your body.

Measured across the fullest part of your chest (nipple level).
Your weight helps us find the safest compression level, so your binder fits just right.

This recommendation is based on real customer fit data — but every body is different. If you’re unsure, use the full chart and fit tips below to confirm your best fit.

TOMSCOUT Sizing Chart

Use this chart to confirm your size based on your top bust and weight. Between sizes? Keep scrolling for expert tips on choosing your ideal fit.

Size Top Bust (cm) Weight (kg)
XS72 – 7740 – 45
S77 – 8245 – 50
M82 – 8750 – 55
L87 – 9255 – 60
XL92 – 9760 – 65
2XL97 – 10265 – 70
3XL102 – 10770 – 75
4XL107 – 11275 – 80

Between Sizes? Here’s What to Do

Choose your size based on how your body feels — not just the numbers.

Go one size up if you:

  • Have broad shoulders or a muscular build
  • Are above the listed weight range
  • Prefer more room to breathe and move

Go one size down if you:

  • Have a lean or lightweight frame
  • Prefer a snug, flatter look

We recommend sizing up — especially if you’re new to binding or between sizes. Comfort and safety always come first.

No Measuring Tape?
We’ve Got You Covered

You can still find your binder size using your bra size — no tools required.

Bra Size to Top Bust Converter

Bra Size to Bust Conversion Chart

Use this chart to estimate your top bust in centimeters based on your regular bra or sports bra size.

This method is a helpful backup — but for the most accurate fit, we recommend measuring with a soft tape whenever possible.

Avoid Common Sizing Mistakes

Use these smart reminders to get your safest, most comfortable fit — no guesswork required.

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Brand sizes aren’t universal

TOMSCOUT binders are uniquely designed. Always use our sizing guide — not another brand’s chart.

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Always re-measure

Even if you’ve bought before, a fresh measurement takes seconds — and prevents returns or discomfort.

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Don’t guess — measure

Measuring beats guessing every time — it’s the fastest way to get a binder that feels right.

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Choose your compression level

Some want firm flattening. Others prefer light, breathable support. Pick what feels right for your body.

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Re-check over time

Weight, muscle, or hormone changes? A quick re-measure keeps your fit safe and affirming.

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Fabric impacts fit

Different materials stretch, support, and compress differently. Check our Binder Comparison Guide to find what works best for you.

Choose Your Binder Style

Now that you’ve found your size, choose the binder that fits your goals—whether it’s comfort, structure, or something in between.

TOMSCOUT STRENGTH chest binder

TOMSCOUT STRENGTH

High Compression. Clean Silhouette.
Built to Affirm.

TOMSCOUT BECOMING chest binder

TOMSCOUT BECOMING

Gentle Compression. Full Ease.
Made to Evolve.

Frequently Asked Questions

Nope. Every brand fits differently.
For your best TOMSCOUT fit, always use our size guide—not past sizes from other brands.

Use centimeters for the most accurate fit — our testing and sizing are based on metric measurements.

📏 If you're using inches:
  • Always round up (e.g. 33¾″ → 34″)
  • Never round down — that leads to a too-tight fit

Your binder should:
  • Let you move freely and breathe with ease
  • Flatten more than a sports bra
⚠️ Warning signs:
  • Can’t breathe or feel back pain? → You likely need a larger size
  • Chest still looks similar to a sports bra? → Consider sizing down

  • Want a firmer, more compressed fit? → Choose the smaller size
  • Have broad shoulders or a higher BMI? → Go larger for comfort

No stress — it happens.
We offer a fast, no-hassle exchange policy so you can switch sizes easily and get the fit you deserve.

Every product page includes one.
Just click the “Size Chart” link beside the size options to compare your measurements.