A4 = 415 Hz · Baroque pitch reference
Online tuner at A = 415 Hz
Tune at A4 = 415 Hz when a Baroque-pitch ensemble, historical keyboard or existing recording uses that reference instead of modern A4 = 440 Hz. The live Chromatic tuner opens already set to 415 Hz.
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Private by design · no account · audio stays on this device
Live target±5 cents
A4415 HzChromatic
FlatIn tuneSharp
Know the target
What changes when the reference is A4 = 415 Hz
A4 = 415 Hz defines the frequency assigned to the note A above middle C. It is a reference-pitch choice, not a new note system: the tuner keeps the same twelve chromatic note names and rescales every target frequency from that A4 reference. This is why an instrument that is correct at 415 Hz can look flat if a tuner is still set to 440 Hz.
Use 415 Hz only when the musicians, keyboard, recording or conductor are working from the same reference. Start in Chromatic mode, check a stable A if one is available, then tune the remaining notes with the cents marker centered. The microphone analysis remains local to the browser throughout the process.
Four clear steps
How to tune accurately
- 1Open the live tuner from this page; Chromatic mode starts with A = 415 Hz selected in the URL.
- 2Allow microphone access, then play one clean sustained reference note or open string.
- 3Confirm the header still reads A = 415 Hz before making fine adjustments.
- 4Keep the cents marker in the green ±5-cent zone, then move to the next note or instrument string.
Selected reference
Pitch targets at A4 = 415 Hz
| Register | Target | Frequency |
|---|---|---|
| Lower octave | A3 | 207.50 Hz |
| Reference | A4 | 415.00 Hz |
| Upper octave | A5 | 830.00 Hz |
The selected reference rescales every chromatic target. Use the exact A4 value agreed by the ensemble before tuning any instrument.
Practical answers
Frequently asked questions
What is A4 = 415 Hz used for?
It is a Baroque-pitch reference used when the ensemble or instrument is set to that lower A4 standard rather than modern 440 Hz.
Does 415 Hz change the note names?
No. The tuner still identifies the same chromatic notes; it recalculates their frequencies from A4 = 415 Hz.
Does tuner.love upload my microphone audio?
No. Pitch analysis runs locally in your browser. Microphone audio is not uploaded to a backend and is never replayed through your speakers.
Ready to tune?
Open the live tuner. Your browser handles the microphone signal locally.
Open online tuner at a = 415 hz