A4 = 415 Hz · baroque pitch
415 Hz tuner.
Tune to A = 415 Hz, the usual baroque pitch. It sits almost exactly a half step below standard 440.
Tuner · Any tuning
Tune your guitar.
Pluck a string and the meter shows how far off it is. Tap any string to hear it at its true pitch and tune by ear.
- Pick any instrument and tuning
- Shift it down or up by half steps
- Set A to anything: 440, 432, 442…
E A D G B E · A = 415
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Keys: Space start or stop · ← → half step · ↑ ↓ A (Shift: bigger steps) · 1–9 string · M mode · R hear · − + volume · L copy link · Esc done
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Strings 1 → 6
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Tuning
E Standard
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Moves every string a little, for example to match a recording.
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+ adds a lower string at the top. − takes the top string away.
Notes from C0 to C8. Type a note like D2, F♯3 or B♭1, or use − and +.
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Reference A
Slider 380–500 Hz. Type any value from 300 to 600 Hz.
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Sound
Violin, viola, cello and double bass start with Bowed, the rest with Acoustic.
Note length
Match a recording Beta
Find the A a song was recorded at, then tune to it and play along.
…listening
Play the song, loud and clear.
Result
This recording sits on A 440
The tuner already matches it: nothing to change.
A recording is only known within a half step: if the song is a half step down, also change the tuning.
Beta: tested on real records and synthetic songs. Check the result by ear.
Nothing is uploaded: the sound is measured on this device.
Settings
Mode
Guided: one string at a time, from the thickest.
Meter
Bar: a slider with a mint in-tune zone.
Note length
How long a tapped string and Hear sound. Repeat plays the string again every few seconds, Continuous holds it: tap it again to stop.
Reference sound
Violin, viola, cello and double bass start with Bowed, the rest with Acoustic. A sound you pick stays.
Volume
Phone speakers play very low notes an octave up.
Note names
Sharps and flats
Octave numbers (E2, E4)
Tells the two E strings apart: E2 is the low one, E4 the high one.
Frequencies (Hz)
Each string's pitch in hertz, such as 82.4 Hz.
In tune within
Precise is not used with harmonics: Normal ±3 applies.
Harmonic mode
For one low string: play its 12th-fret harmonic (×2) or its 5th-fret one (×4).
Pro view
The pitch heard in Hz, tenths of a cent and the input picker. Turns on octave numbers and frequencies.
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−101.27 ¢ vs 440
What A = 415 changes
A4 = 415 Hz is −101.27 cents from 440. Every note moves by the same amount, so note names, chord shapes and tunings all stay the same; only the pitch moves. String tension changes by about −11.0% (approx.).
The tuner on this page starts at A = 415 for every instrument and tuning. Change it anytime with the A chip, and choose whether to keep 415 as your usual A4.
| String | Note | A = 440 | A = 415 |
|---|---|---|---|
| 6 | E2 | 82.41 | 77.72 |
| 5 | A2 | 110.00 | 103.75 |
| 4 | D3 | 146.83 | 138.49 |
| 3 | G3 | 196.00 | 184.86 |
| 2 | B3 | 246.94 | 232.91 |
| 1 | E4 | 329.63 | 310.90 |
History
Where this pitch comes from
In the 17th and 18th centuries pitch varied widely, from below 400 to above 460 Hz, depending on the city and on whether the music was for church, chamber or opera.
Modern early-music ensembles settled on 415 Hz as a practical "baroque pitch". It is almost exactly one half step below 440 (exactly would be 415.30 Hz), so harpsichords and organs with transposing keyboards can switch between the two.
You will also meet 392 Hz for French baroque music, 430 Hz for some classical-era music, and 466 Hz (Chorton) for some church music. All of them are in the A chip.
A4 = 415 Hz
Every note at A = 415
| Note | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|---|
| C | 15.42 | 30.85 | 61.69 | 123.38 | 246.76 | 493.52 | 987.04 | 1974.08 | 3948.17 |
| C♯ / D♭ | 16.34 | 32.68 | 65.36 | 130.72 | 261.43 | 522.87 | 1045.73 | 2091.47 | 4182.94 |
| D | 17.31 | 34.62 | 69.24 | 138.49 | 276.98 | 553.96 | 1107.92 | 2215.83 | 4431.67 |
| D♯ / E♭ | 18.34 | 36.68 | 73.36 | 146.72 | 293.45 | 586.90 | 1173.80 | 2347.59 | 4695.19 |
| E | 19.43 | 38.86 | 77.72 | 155.45 | 310.90 | 621.80 | 1243.59 | 2487.19 | 4974.38 |
| F | 20.59 | 41.17 | 82.35 | 164.69 | 329.39 | 658.77 | 1317.54 | 2635.09 | 5270.17 |
| F♯ / G♭ | 21.81 | 43.62 | 87.24 | 174.49 | 348.97 | 697.94 | 1395.89 | 2791.78 | 5583.55 |
| G | 23.11 | 46.22 | 92.43 | 184.86 | 369.72 | 739.45 | 1478.89 | 2957.78 | 5915.57 |
| G♯ / A♭ | 24.48 | 48.96 | 97.93 | 195.85 | 391.71 | 783.42 | 1566.83 | 3133.66 | 6267.33 |
| A | 25.94 | 51.88 | 103.75 | 207.50 | 415.00 | 830.00 | 1660.00 | 3320.00 | 6640.00 |
| A♯ / B♭ | 27.48 | 54.96 | 109.92 | 219.84 | 439.68 | 879.35 | 1758.71 | 3517.42 | 7034.83 |
| B | 29.11 | 58.23 | 116.46 | 232.91 | 465.82 | 931.64 | 1863.29 | 3726.57 | 7453.15 |
Questions
How do I tune to 415 Hz?
Use the tuner on this page: it is already set to A = 415. Pick your instrument, pluck each string and follow the meter: Low means tighten, High means loosen. For a guitar in standard tuning the targets are E2 77.72, A2 103.75, D3 138.49, G3 184.86, B3 232.91, E4 310.90 Hz.
Is 415 the same as tuning down a half step?
Almost. A half step below 440 is 415.30 Hz, so 415 is about 1.3 cents lower. The big difference is in the names: at A = 415 a guitar is still called E Standard, while at 440 the same sound is called Eb Standard.
Can modern instruments play at 415?
Yes, but strings get about 11% looser (approx.), which changes the feel and the tone. Gut strings and instruments built for baroque pitch work best.