Unit Converter

Basic Usage

• Select a category tab (Length, Weight, Temperature, etc.)
• Enter a value in the "From" input field
• Select the source unit and target unit
• Results appear instantly with the conversion formula

Advanced Features

• Reverse Conversion: Click the swap button to switch units
• Search Units: Use the search bar to filter units
• Copy Result: Click "Copy Result" to copy to clipboard
• Batch Conversion: Enter multiple values (one per line) in the batch section

History & Favorites

• Conversions are automatically saved to history
• Click "Add to Favorites" to save frequently used conversions
• Click on history/favorite items to reuse them
• Clear history using the "Clear History" button

Custom Units

• Add custom units by entering a name and conversion factor
• The conversion factor is relative to the base unit of the category
• Custom units are saved and persist across sessions

Currency Conversion

• Currency rates are fetched from a live API
• Rates are cached for 1 hour to reduce API calls
• In offline mode, cached rates are used

Offline Mode

• The converter works offline for all non-currency conversions
• Currency conversions use cached rates when offline
• An indicator shows when you're in offline mode

API Access

• Use the REST API for programmatic access
• Endpoint: GET /api/convert?value=X&from=UNIT&to=UNIT
• Returns JSON with result and formula

Supported Categories

• Length: m, ft, in, km, mi, cm, mm, yd
• Weight: kg, lb, oz, g, mg, ton
• Temperature: C, F, K
• Volume: L, gal, mL, cup, pt, qt
• Area: sq m, sq ft, acres, hectare, sq km
• Speed: mph, km/h, m/s, knot, ft/s
• Time: sec, min, hr, days, weeks, months, years
• Data: MB, GB, TB, KB, PB, B
• Currency: USD, EUR, GBP, JPY, and more

REST API Endpoint

Parameters

• value (required): Numeric value to convert
• from (required): Source unit
• to (required): Target unit
• category (optional): Category (defaults to auto-detect)

Example Request

Example Response

{
    "success": true,
    "result": 328.084,
    "from": "m",
    "to": "ft",
    "value": 100,
    "formula": "100 × 3.28084"
}

Error Response

{
    "success": false,
    "error": "Invalid unit"
}