openskin

Skin math — SPF protection, burn time, pH balance, ingredient concentration, and coverage calculations.

Install

npm install openskin

Usage

const openskin = require('openskin');

const result = openskin({
  spf: 50,
  uvIndex: 8,
  skinTone: 2,
  ph: 5.5,
  concentration: 2,
  coverage: 80,
});

console.log(result);
// {
//   spfProtection: '98.00%',
//   burnTime: '125.0 min',
//   phBalance: 'balanced',
//   effectiveConcentration: '1.6000%',
//   coverageRatio: '0.80'
// }

API

openskin(params)

Returns an object with calculated skin metrics.

params

| Param | Type | Default | Description | | --------------- | -------- | ------- | ------------------------------------------------ | | spf | number | 0 | Sun Protection Factor value | | uvIndex | number | 0 | UV index (0–11+) | | skinTone | number | 1 | Skin tone multiplier (1 = light, higher = darker)| | ph | number | 7 | pH level of product or skin | | concentration | number | 0 | Active ingredient concentration (%) | | coverage | number | 0 | Product coverage (0–100%) |

Returns

| Key | Type | Description | | ------------------------ | -------- | -------------------------------------------------------- | | spfProtection | string | Percentage of UV rays blocked | | burnTime | string | Estimated minutes before sunburn | | phBalance | string | acidic (< 4.5), balanced (4.5–6.5), alkaline (> 6.5) | | effectiveConcentration | string | Active ingredient % adjusted for coverage | | coverageRatio | string | Coverage as a 0–1 ratio |

License

Apache-2.0 © Ahmad Awais