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+# CSS Calc <img src="https://cssdb.org/images/css.svg" alt="for CSS" width="90" height="90" align="right">
+
+[<img alt="npm version" src="https://img.shields.io/npm/v/@csstools/css-calc.svg" height="20">][npm-url]
+[<img alt="Build Status" src="https://github.com/csstools/postcss-plugins/actions/workflows/test.yml/badge.svg?branch=main" height="20">][cli-url]
+[<img alt="Discord" src="https://shields.io/badge/Discord-5865F2?logo=discord&logoColor=white">][discord]
+
+Implemented from : https://drafts.csswg.org/css-values-4/ on 2023-02-17
+
+## Usage
+
+Add [CSS calc] to your project:
+
+```bash
+npm install @csstools/css-calc @csstools/css-parser-algorithms @csstools/css-tokenizer --save-dev
+```
+
+### With string values :
+
+```mjs
+import { calc } from '@csstools/css-calc';
+
+// '20'
+console.log(calc('calc(10 * 2)'));
+```
+
+### With component values :
+
+```mjs
+import { stringify, tokenizer } from '@csstools/css-tokenizer';
+import { parseCommaSeparatedListOfComponentValues } from '@csstools/css-parser-algorithms';
+import { calcFromComponentValues } from '@csstools/css-calc';
+
+const t = tokenizer({
+	css: 'calc(10 * 2)',
+});
+
+const tokens = [];
+
+{
+	while (!t.endOfFile()) {
+		tokens.push(t.nextToken());
+	}
+
+	tokens.push(t.nextToken()); // EOF-token
+}
+
+const result = parseCommaSeparatedListOfComponentValues(tokens, {});
+
+// filter or mutate the component values
+
+const calcResult = calcFromComponentValues(result, { precision: 5, toCanonicalUnits: true });
+
+// filter or mutate the component values even further
+
+const calcResultStr = calcResult.map((componentValues) => {
+	return componentValues.map((x) => stringify(...x.tokens())).join('');
+}).join(',');
+
+// '20'
+console.log(calcResultStr);
+```
+
+### Options
+
+#### `precision` :
+
+The default precision is fairly high.
+It aims to be high enough to make rounding unnoticeable in the browser.
+
+You can set it to a lower number to suit your needs.
+
+```mjs
+import { calc } from '@csstools/css-calc';
+
+// '0.3'
+console.log(calc('calc(1 / 3)', { precision: 1 }));
+// '0.33'
+console.log(calc('calc(1 / 3)', { precision: 2 }));
+```
+
+#### `globals` :
+
+Pass global values as a map of key value pairs.
+
+> Example : Relative color syntax (`lch(from pink calc(l / 2) c h)`) exposes color channel information as ident tokens.
+> By passing globals for `l`, `c` and `h` it is possible to solve nested `calc()`'s.
+
+```mjs
+import { calc } from '@csstools/css-calc';
+
+const globals = new Map([
+	['a', '10px'],
+	['b', '2rem'],
+]);
+
+// '20px'
+console.log(calc('calc(a * 2)', { globals: globals }));
+// '6rem'
+console.log(calc('calc(b * 3)', { globals: globals }));
+```
+
+#### `toCanonicalUnits` :
+
+By default this package will try to preserve units.
+The heuristic to do this is very simplistic.
+We take the first unit we encounter and try to convert other dimensions to that unit.
+
+This better matches what users expect from a CSS dev tool.
+
+If you want to have outputs that are closes to CSS serialized values you can pass `toCanonicalUnits: true`.
+
+```mjs
+import { calc } from '@csstools/css-calc';
+
+// '20hz'
+console.log(calc('calc(0.01khz + 10hz)', { toCanonicalUnits: true }));
+
+// '20hz'
+console.log(calc('calc(10hz + 0.01khz)', { toCanonicalUnits: true }));
+
+// '0.02khz' !!!
+console.log(calc('calc(0.01khz + 10hz)', { toCanonicalUnits: false }));
+
+// '20hz'
+console.log(calc('calc(10hz + 0.01khz)', { toCanonicalUnits: false }));
+```
+
+[cli-url]: https://github.com/csstools/postcss-plugins/actions/workflows/test.yml?query=workflow/test
+[discord]: https://discord.gg/bUadyRwkJS
+[npm-url]: https://www.npmjs.com/package/@csstools/css-calc
+
+[CSS calc]: https://github.com/csstools/postcss-plugins/tree/main/packages/css-calc