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Note Frequency Calculator

Science & Engineering

Equal temperament f=440×2^(n/12) with cents detune

Quick Answer

Note Frequency Calculator: Equal temperament f=440×2^(n/12) with cents detune. Note Frequency Calculator uses standard science & engineering formulas to compute accurate results instantly.

A4 reference

Select note

Hz
¢
Frequency of A4 (A4=440 Hz)440.00 Hz

MIDI 69 · +0 semitones from A4

Calculation

  1. 1MIDI = (4+1)×12 + 9 = 69 (A4 = 69)
  2. 2Semitone ratio 2^(1/12) ≈ 1.0594631, octave doubles
  3. 3f = 440 × 2^(0/12) = 440.00 Hz
Equal temperament divides an octave into 12 equal semitones (ratio 2^(1/12)≈1.0595). Middle C (C4, MIDI 60) is 261.63 Hz at A4=440; piano range A0 (27.5 Hz) to C8 (4186.01 Hz). A4=440 Hz was standardized in 1939 (ISO 16); Baroque ensembles use 415, orchestras 442-443. 100 cents = 1 semitone.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Note Frequency Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Note Frequency Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Equal temperament f=440×2^(n/12) with cents detune.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Note Frequency Calculator formula

Note Frequency Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Note Frequency Calculator?
Open the page and fill in the input fields — results update automatically. Equal temperament f=440×2^(n/12) with cents detune.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Note Frequency Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/pitch-frequency

Results provided by this tool are for reference only and do not constitute professional advice.