Frequency / Note Calculator

🎛️ EQ & Mixing
Knowing note frequencies helps you make surgical EQ cuts. Muddy bass around 80-100 Hz? That's E2 to G2. Harsh vocals at 3kHz? That's between F♯7 and G7. Instead of sweeping blindly, target the exact note that's causing problems.

🎸 Tuning & Intonation
Use the Hz input to check if an instrument is in tune. The cents deviation shows how sharp or flat a pitch is — ±5 cents is generally acceptable, beyond ±10 cents becomes noticeable to most listeners.

🔊 Subtractive Synthesis
When designing bass sounds, knowing your root frequency matters. A sub-bass at C1 (32.7 Hz) hits differently than one at E1 (41.2 Hz). Some speakers can't even reproduce frequencies below 40 Hz, so choose wisely.

🎼 Harmonic Series
The harmonic series shows which frequencies naturally resonate above your fundamental. The 2nd harmonic is an octave up, 3rd is an octave + fifth, 4th is two octaves. This is why certain intervals sound "consonant" — they share harmonics.

📐 The Math
f = 440 × 2^((n-69)/12) where n is the MIDI note number. Each semitone is a ratio of 2^(1/12) ≈ 1.0595. This equal temperament system means every key has the same relative intervals.

🎹 A4 = 440 Hz?
This is the modern standard, but it wasn't always so. Baroque pitch (A=415) is nearly a semitone lower. Some orchestras tune to 442 or 444 for a "brighter" sound. The 432 Hz tuning has passionate advocates who claim it's more natural — the math doesn't support mystical claims, but it does sound subtly different.