Get all tools offline & ad-free in a single file — no install needed.Just $9, one-time.

Get tonal.fm Pro →

D7 · 2349.3 Hz

D7 is piano key 78 of 88 and MIDI note 98 - the top octave of the piano, glittering and percussive - the ear starts losing pitch precision here. Play the pure tone below, tune to it, or explore the note in every octave.

2349.32Hz

Volume50%

Waveform

D7 at a glance

Frequency

2349.3 Hz

Wavelength (in air)

14.6 cm

MIDI note

98

Piano key

78 / 88

Octave

7

Enharmonic

—

All values assume twelve-tone equal temperament at the international standard pitch of A4 = 440 Hz. In that system every semitone has the same size - a frequency ratio of 2^(1/12) - so D7 is exactly 440 × 2^(29/12) Hz. Under alternative references the note shifts with the reference: at A4 = 432 Hz, D7 becomes 2306.6 Hz.

D in every octave

Note	Frequency	MIDI	Piano key
D1	36.71 Hz	26	6
D2	73.42 Hz	38	18
D3	146.83 Hz	50	30
D4	293.66 Hz	62	42
D5	587.33 Hz	74	54
D6	1174.7 Hz	86	66
D7 ←	2349.3 Hz	98	78

Each octave doubles the frequency - the simplest relationship in music, and the reason notes an octave apart sound like “the same note, higher”.

Neighboring notes

C7 · 2093.0 Hz C♯7 · 2217.5 HzD7 · 2349.3 HzD♯7 · 2489.0 Hz E7 · 2637.0 Hz

One semitone down is C♯7 at 2217.5 Hz; one semitone up is D♯7 at 2489.0 Hz. Need a frequency between notes, or a different waveform? The tone generator plays anything from 20 Hz to 20 kHz; the note ↔ frequency converter does the math both directions, and the chromatic tuner listens to your instrument and shows the offset in cents.

D7 FAQ

What frequency is D7?

D7 is 2349.3 Hz in twelve-tone equal temperament with the standard reference of A4 = 440 Hz. Every semitone step multiplies the frequency by the twelfth root of two (about 1.0595), and D7 sits 29 semitones above A4.

What MIDI number and piano key is D7?

D7 is MIDI note 98 and key 78 of 88 on a standard piano. Octave numbering follows scientific pitch notation, where middle C is C4 (MIDI 60).

How do I tune to D7?

Play the tone above and match your instrument by ear until the beating between the two pitches slows and disappears, or use the chromatic tuner with your microphone for a cents readout. Small mistunings show up as slow beats: one beat per second at this pitch means you are about 0.7 cents off.

Try Our Other Audio Tools

Online Tone Generator

Generate single tones with precise frequency control. Perfect for quick audio testing and tuning.

Multiple Tone Generator

Play multiple frequencies simultaneously with independent volume and panning controls.

Frequency Sweep Generator

Create linear or exponential frequency sweeps for speaker testing and room acoustics analysis.

Binaural Beats Generator

Generate binaural beats for meditation, focus, and relaxation. Requires headphones for proper effect.

DTMF Tone Generator

Generate telephone dial pad tones (Dual Tone Multi Frequency). Interactive touch-tone dial pad.

Online Metronome

Professional metronome with tap tempo, time signatures, subdivisions, and tempo trainer for musicians.

BPM Counter

Tap along to any song to find its tempo in beats per minute. Includes tempo markings reference.

Chord Player

Hear major, minor, diminished, and seventh chords in every key. Block chords or arpeggios.

Chord Progression Player

Hear classic progressions like I-V-vi-IV and 12-bar blues in any key at any tempo.

Online Piano

Free browser piano with 3 octaves, note names, and computer keyboard support.

Noise Generator

Generate white, pink, and brown noise for sleep, focus, tinnitus relief, and speaker burn-in.

Instrument Tuner

Reference tuning notes for guitar, bass, ukulele, violin, cello, and more at concert pitch (A440).

Subwoofer Test

Test your subwoofer with a 60-second frequency sweep (150Hz-1Hz) and individual bass test tones.

Hearing Test

Test your hearing range from 8kHz to 20kHz. Find your hearing age and compare with averages.

Solfeggio Frequencies

Ancient healing tones including 528Hz (DNA repair). For meditation, chakra activation, and spiritual healing.

Speaker Balance Test

Test stereo balance with panning control and left/right channel testing. Perfect for speaker setup.

Speaker Phase Test

Check speaker wiring polarity by comparing in-phase and out-of-phase test signals.

Audio Latency Test

Measure your Bluetooth or system audio delay in milliseconds with a click-and-flash sync test.

Spectrum Analyzer

Real-time frequency analysis of your microphone input with a live log-frequency display.

Decibel Meter

Measure approximate sound levels with your microphone - live dB with min/avg/max tracking.

Mic Test

Check your microphone in seconds: live waveform, level meter, and record-and-playback check.

Interval Ear Trainer

Learn to recognize musical intervals by ear with quiz mode, score tracking, and song mnemonics.

Pitch Pipe

Chromatic pitch pipe with all 12 notes across 3 octaves. Perfect for singers, choirs, and a cappella groups.

Shepard Tone

Experience the auditory illusion of an infinitely ascending or descending tone. Mind-bending psychoacoustic phenomenon.

Mosquito Tone

Can you hear the mosquito tone? High-frequency test (15-20kHz) that only young people can hear. Find your hearing age!

Soundscape Builder

Create relaxing ambient soundscapes with singing bowls, nature sounds, and binaural beats.

Fix My Speaker

Three sound modes to clean a muffled speaker: 165 Hz water eject, dust-shaking sweeps, and vibration.

Water Eject Sound

Push water out of a wet phone or watch speaker with a pulsed 165 Hz tone - the same method Apple Watch uses.

Dog Whistle

Adjustable high-frequency whistle (8-22 kHz) for dog training - clearly audible to dogs, silent to most adults.

Isochronic Tones

Rhythmic pulsed tones across delta to gamma ranges. Stronger than binaural beats and works without headphones.

Perfect Pitch Test

Name 12 random notes with no reference tone and find out if you have absolute pitch or great pitch memory.

Vocal Range Test

Sing your lowest and highest notes and get your range plus voice type - bass to soprano. Mic-based, nothing uploaded.

Hearing Age Test

Find the highest frequency you can hear (8-20 kHz) and see how old your ears test. Takes one minute.

Vocal Remover

Instant karaoke via center-channel cancellation - free, unlimited, and processed locally.

Voice Recorder

Record from your microphone and download as WAV - no signup, nothing uploaded.

Volume Normalizer

Normalize any file to a LUFS target with true-peak protection instead of silent clipping.

Drum Machine

16-step beat maker with synthesized 808-style drums, swing, and shareable pattern links.

Audio Analyzer / LUFS Meter

Drop a file and get integrated LUFS, true peak, RMS, and a waveform - measured locally, nothing uploaded.

Chromatic Tuner

Microphone tuner with a cents needle - play any note on any instrument and tune to ±5 cents.

Headphone Test

Five-minute headphone checkup: channels, wiring polarity, bass and treble reach, and driver distortion.

Surround Sound Test

Send noise to each 5.1 channel - fronts, center, surrounds, and subwoofer - and catch swapped or dead speakers.