Unit Converter

Convert between units of length, weight, temperature, volume, area, and speed with instant results.

All Conversions in This Category

About the Unit Converter

The Oneyfy Unit Converter handles 8 categories with dozens of units. All conversions are performed using precise multiplication factors and, for temperature, specific formulas.

How to Use

Select a Category (Length, Weight, Temperature, Volume, Area, Speed, etc.).
Enter the Value you want to convert.
Select the From unit and the To unit.
Results update instantly as you type. Click ⇄ to swap units.

How It Works

Each unit has a conversion factor relative to a base unit. The formula is: result = value × (fromFactor / toFactor). Temperature uses direct formulas (Celsius to Fahrenheit: F = C × 9/5 + 32).

Example

Convert 100 km to miles: 100 × 0.621371 = 62.14 miles.
Convert 72°F to Celsius: (72 − 32) × 5/9 = 22.22°C.

Frequently Asked Questions

Conversions use up to 8 significant digits and match the precision of JavaScript's 64-bit floating-point numbers. Results are rounded to 8 decimal places for display.

Temperature scales have different zero points (they're not proportional), so you can't use a simple multiplication factor. Specific formulas are used: °C to °F, °F to °C, °C to K, etc.

This is a client-side tool, so customization isn't available. However, we cover the most commonly needed units for each category.