Flugelhorn Tuner — Free Online B♭ Flugelhorn Tuner

A flugelhorn is in B♭ like a trumpet and built on the widest conical bore of the three, which buys the soft attack and costs stability. Above the stave it gives way where a trumpet would hold, so a flat reading up there is usually the instrument doing its job rather than a slide that needs moving.

Tap “Start Tuning” and allow microphone access — audio is analyzed on your device and never leaves it. No microphone? You can still play reference tones for every note.

B♭ like a trumpet, conical like a cornet — only more so

A flugelhorn is in B♭ and sounds a major second below the page, so written C is concert B♭4 at 466.16 Hz. The transposition, the fingerings and the valve arithmetic are the trumpet’s, and a tuner reads all three instruments the same way.

The difference is the bore, and the flugelhorn takes it furthest: the widest conical taper of the three and a large bell throat. That is what buys the soft attack and the dark middle register — and what it costs is stability at the top, which is the single most useful thing to understand before you start adjusting anything.

Try itFlugelhorn — written note to concert pitch

Concert pitch in the tone, written note in the label. Start from the highlighted open B♭.

The flat top is the instrument, not the slide

Above the stave a flugelhorn gives way where a trumpet would hold. The partials are closer together and the wide taper offers less resistance, so the note sags rather than locking. Players arriving from trumpet reliably read this as a tuning fault and pull the main slide in to correct it.

That is the wrong move: the main slide is a whole-instrument calibration, so pulling it in to fix the top makes everything below sharp. The flat upper register is corrected with air and embouchure, and to the extent it cannot be, it is a property of the instrument you have chosen for its sound.

The routine

Warm the instrument through for five minutes. Brass rises roughly a cent per degree Fahrenheit; a cold horn set to pitch is a sharp horn all evening.
Play open written C, mezzo-forte, in the middle of your range. Not high, where the instrument gives. Watch for concert B♭.
Sharp: main slide out. Flat: main slide in. Then stop touching it.
Check written D (1–3) and written C♯ (1–2–3). Both read sharp on any valved brass instrument. Use whatever compensation your horn actually has — a third-valve trigger or ring, or a fourth valve — rather than assuming a trumpet’s first-valve mechanism is present.
Play the open series upward and record the drift. This is the flugelhorn step. Know your own instrument’s number.

Make the dial read your written note instead

Everything above names the concert pitch actually in the air, which is what a tuner is for and what the rest of the ensemble hears. But it is not what is printed on your part: a B♭ flugelhorn sounds a major second lower than it reads, so written C comes out as concert B♭.

This tuner can close that gap for you. The Transposition setting adds the interval back before the note is named, so the dial reports the note you are reading rather than the note you are sounding — the one thing a guitar tuner has no reason to do, and the reason to keep this page rather than the first tuner in the results.

Open this tuner set to B♭ → — or reach it yourself from the gear icon on the dial, under Transposition. The choice is remembered on this device and it travels in the link, so a section leader can send that URL to a stand full of flugelhorns and everyone arrives set the same way.

Switch it back to C — Concert pitch whenever you need to check yourself against the room, tune to a piano, or find out what a written note is actually sounding.

The three B♭ instruments

Instrument	Bore	Behaviour at the top
Trumpet	mostly cylindrical	holds firmly; partials well separated
Cornet	conical	flexible; easy to lip into place
Flugelhorn (this page)	widely conical	gives way above the stave

Same pitches, same fingerings, three different amounts of help from the instrument. If you read German band parts, this page also exists as Flügelhorn stimmen.

Frequently asked questions

Does a flugelhorn transpose like a trumpet?

Identically. It is in B♭ and sounds a major second below the written note, so written C is concert B♭4 at 466.16 Hz, and the fingerings are the trumpet’s. A tuner cannot distinguish the three B♭ instruments at all — it hears the pitch leaving the bell and nothing about what produced it.

My flugelhorn goes flat above the stave. Is it broken?

Almost certainly not. The wide conical bore that gives a flugelhorn its sound also gives it less upper-register stability than a trumpet — the instrument yields where a trumpet holds. That is a design characteristic, not a fault, and it is why flugelhorn parts sit where they do. Chasing it with the main slide will pull the rest of the instrument flat to fix the top.

Why does my flugelhorn have a third-valve trigger and no first?

Because the compensations it needs are not quite the trumpet’s. Many flugelhorns carry a third-valve trigger or ring alone; some four-valve instruments use the fourth valve to solve the low-register problem instead. Check what your instrument actually has before assuming a trumpet routine transfers — the sharp combinations are the same ones, but the mechanism for correcting them may not be.

Should I use my trumpet mouthpiece?

No — the shank is different (flugelhorns generally take a deeper, more conical mouthpiece and often a different taper entirely), and an adapter changes the effective length of the instrument, which moves the pitch and distorts the intervals. If the horn will not reach pitch with the main slide at a sensible position, the mouthpiece is the first thing to check.

Is the flugelhorn harder to play in tune than a cornet?

In the upper register, yes, and for the same reason it sounds the way it does: more conical taper means more flexibility, and more flexibility means less of the instrument holding the note in place for you. Low and middle register it is comparable. The practical consequence is that a flugelhorn rewards checking your own scale with a tuner more than the other two do.