Notes and Frequency Guide
33 free tools and guides covering note frequencies, chromatic tuners, virtual piano, MIDI charts, 808 tuning, and more.
Frequency Reference Tools
Convert any note name to Hz or find which note matches a frequency. A0 to C8, all 12 semitones, enharmonic equivalents.
Full Hz chart for every MIDI note and piano key. All 128 MIDI notes with frequencies from C-1 (8.18 Hz) to G9 (12543.85 Hz).
Learn how Hz and pitch relate, octave doubling formula, 808 tuning reference, producer use cases (EQ, sample flip, oscillator setup).
Enter any frequency in Hz and find the closest musical note. Shows cents offset from equal temperament.
Complete MIDI note numbers 0-127 with note names and Hz values. Includes MIDI 60 (middle C) reference and DAW labeling differences.
Complete EQ guide for music production. Sub bass to air frequencies, instrument ranges, EQ tips for every frequency band.
All voice types (bass, baritone, tenor, alto, mezzo-soprano, soprano) with Hz ranges and note ranges.
Tuning Guides
How to tune your 808 to the key of your track. Full 808 frequency chart, semitone tuning tables, DAW-specific tips.
What A4 = 440 Hz means, history of the ISO 16 standard, why DAWs and orchestras use 440 Hz, all A notes by octave.
What 432 Hz tuning is, how it differs from 440 Hz, full 432 Hz note chart, how to convert your DAW, and the science behind the debate.
Tuner and Piano Tools
Free browser-based chromatic tuner. Works for guitar, bass, ukulele, violin, and all chromatic instruments. No download or account needed.
Play a virtual piano in your browser. Keyboard shortcuts, real-time Hz display, all 88 keys. No download, no signup.
Recommended Starting Points
Not sure where to start? Follow this path depending on what you need.
Quick Reference by Use Case
| Use Case | What You Need | Best Guide |
|---|---|---|
| Tune an 808 to my track | Hz for each note in key | 808 Tuning Guide |
| Find the Hz of a MIDI note | MIDI number to Hz | MIDI Note Chart |
| EQ a specific note frequency | Note name to Hz | Note Frequency Calculator |
| Identify a hum or resonance | Hz to note name | Hz to Note Converter |
| Tune guitar or bass | Chromatic tuner | Chromatic Tuner |
| EQ mix by frequency range | Frequency band guide | EQ Frequency Chart |
| Convert track to 432 Hz | 432 Hz note chart | 432 Hz Tuning Guide |
| Find my vocal range | Voice type Hz ranges | Vocal Range Chart |
| Play notes without an instrument | Browser piano | Virtual Piano |
Tuner App Alternatives
Looking for a free alternative to your tuner app? These pages compare BeatKey to the most popular tuners.
Piano and Learning App Alternatives
Free browser alternatives to popular piano learning and virtual piano apps.
808 Tuning Workflow
The fastest way to tune your 808 in any DAW.
Upload your sample or loop to BeatKey to detect the musical key in seconds.
Enter the root note into the Note Frequency Calculator to get the exact Hz value.
Set your 808 or sub bass oscillator to that Hz in your DAW, or use the 808 Tuning Guide for semitone tables.
All 33 Guides
Frequently Asked Questions
What is A4 in Hz?
A4 is 440 Hz in standard tuning. This is the international pitch standard (ISO 16) used by orchestras, DAWs, and most electronic instruments worldwide. In 432 Hz tuning, A4 becomes 432 Hz instead.
What frequency should I tune my 808 to?
Tune your 808 to the root note of your track. If your track is in C, use C2 (65.41 Hz) or C1 (32.70 Hz) for a sub frequency. Use the 808 Tuning Guide for the full chart and semitone tables.
What is MIDI note 60?
MIDI note 60 is middle C. In most DAWs it is labeled C3 or C4 (labeling varies by manufacturer), with a frequency of 261.63 Hz at A4 = 440 Hz. MIDI notes run from 0 (C-1, 8.18 Hz) to 127 (G9, 12543.85 Hz).
What is the best free online tuner?
The BeatKey chromatic tuner is a free browser-based tuner that works on any device with a microphone. It supports guitar, bass, ukulele, violin, and any chromatic instrument. No download or account required.