# note-to-frequency
[](https://www.npmjs.com/package/note-to-frequency)
[](https://travis-ci.org/duivvv/note-to-frequency)
[](https://david-dm.org/duivvv/note-to-frequency)
[](https://coveralls.io/github/duivvv/note-to-frequency)
[](https://gitmoji.carloscuesta.me/)
> 🎼 Converts a note (scientific pitch notation) to a frequency
### Usage
```js
import noteToFrequency from 'note-to-frequency';
const frequency = noteToFrequency('A4');
console.log(frequency); // > 440
```
### Installation
Install via [yarn](https://github.com/yarnpkg/yarn)
yarn add note-to-frequency (--dev)
or npm
npm install note-to-frequency (--save-dev)
### configuration
You can pass in extra options as a configuration object (➕ required, ➖ optional, ✏️ default)
```js
import noteToFrequency from 'note-to-frequency';
const frequency = noteToFrequency('C2', {base: 446, maxOctave: 4});
console.log(note); // > 66.3
```
➖ **base** ( Number ) ` ✏️ 440 `
📝 base frequency
➖ **maxOctave** ( Number ) ` ✏️ 8 `
📝 max octave allowed
### Examples
see [`example`](example/script.js) folder or the [runkit](https://runkit.com/duivvv/note-to-frequency) example
### Builds
If you don't use a package manager, you can [access `note-to-frequency` via unpkg (CDN)](https://unpkg.com/note-to-frequency/), download the source, or point your package manager to the url.
`note-to-frequency` is compiled as a collection of [CommonJS](http://webpack.github.io/docs/commonjs.html) modules & [ES2015 modules](http://www.2ality.com/2014/09/es6-modules-final.html) for bundlers that support the `jsnext:main` or `module` field in package.json (Rollup, Webpack 2)
The `note-to-frequency` package includes precompiled production and development [UMD](https://github.com/umdjs/umd) builds in the [`dist` folder](https://unpkg.com/note-to-frequency/dist/). They can be used directly without a bundler and are thus compatible with many popular JavaScript module loaders and environments. You can drop a UMD build as a [`