Concert A442 quick reference
- A4 reference
- 442 Hz
- Relative to A440
- +7.9 cents
- Meter range
- A0–C8
What this reference means
A slightly higher reference used by some orchestras and concert settings.
A442 is about 7.85 cents above A440. Confirm the exact reference with the ensemble before a performance.
Sample calculated key targets
The meter applies the same formula to all 88 keys. These sample values make the selected reference visible before microphone use.
| Piano key | Note | MIDI | Frequency |
|---|---|---|---|
| 1 | A0 | 21 | 27.63 Hz |
| 40 | C4 | 60 | 262.81 Hz |
| 49 | A4 | 69 | 442.00 Hz |
| 52 | C5 | 72 | 525.63 Hz |
| 88 | C8 | 108 | 4205.04 Hz |
Need every key? Open the interactive 88-key frequency chart.
Instrument safety and scope
Changing an acoustic piano's overall pitch is technician work, even when the numerical difference looks small.
Method and sources
Each displayed target uses frequency = 442 × 2((MIDI − 69) / 12). This is a transparent equal-temperament calculation. A real piano's string inharmonicity leads technicians to stretch octaves, so a browser target is not a complete tuning curve.
Concert A442 FAQ
What does Concert A442 mean?
A slightly higher reference used by some orchestras and concert settings. A442 is about 7.85 cents above A440. Confirm the exact reference with the ensemble before a performance.
Does this page really use A4 = 442 Hz?
Yes. Every key target is recalculated from A4 = 442 Hz using the 12-tone equal-temperament formula. The selected reference changes both automatic note matching and fixed-key targets.
Can I retune an acoustic piano to 442 Hz with this page?
This page can measure and compare pitch, but it cannot assess the instrument's structure, unisons, stretch, or stability. Ask a qualified piano technician before changing an acoustic piano's overall pitch.