🎯 Mouthpiece Size Calculator
Choose your brass instrument and playing level to get a suggested cup rim diameter in millimetres — a sensible starting point to try, not a substitute for playing a few in person.
🎯 Find a Starting Size
What is a Mouthpiece Size Calculator?
It gives you a ballpark cup rim diameter for your instrument and stage of playing. Bigger instruments — trombone, euphonium, tuba — use wider rims than a trumpet or cornet, and the suggestion inches up with level as your embouchure develops.
Use it as a reference when you're starting out, comparing options, or thinking about a change. Then try a few in person: comfort, range, and the sound you want should always guide the final choice.
❓ Frequently Asked Questions
How does the mouthpiece size calculator work?
Choose your instrument and playing level and it suggests a cup rim diameter in millimetres — the width across the rim where your lips meet the mouthpiece. Larger instruments use larger rims, and the suggestion nudges up slightly as a player advances and develops the strength for a bigger, fuller sound.
Is rim diameter the only thing that matters?
No. Rim diameter is a great starting reference, but cup depth, rim contour, throat, and backbore all shape comfort, range, and tone. Two mouthpieces with the same rim can feel and sound very different, so treat this as a first estimate, not a final answer.
Should a beginner use a bigger or smaller mouthpiece?
Beginners usually start with a moderate, versatile size that balances comfort, endurance, and tone. Very large mouthpieces can be tiring before the embouchure is developed; very small ones can limit sound. The suggestion here leans toward a sensible middle ground and grows with level.
Should I get fitted by a teacher?
If you can, yes. A teacher or experienced player can watch your embouchure, listen to your sound, and let you try several mouthpieces. Personal fit and playing goals matter more than any formula, so use this tool to narrow the field, then try before you commit.