Unit Converter

Unit Converter is a comprehensive free online tool for converting between different units of measurement across seven major categories: length, weight/mass, temperature, volume, area, speed, and time. Whether you're a student solving physics problems, a chef converting recipe measurements, a traveler converting miles to kilometers, or an engineer working with different unit systems, this tool provides instant, accurate conversions with clear formula displays. The converter supports both metric and imperial unit systems with precise conversion factors. Length conversions include millimeters (mm), centimeters (cm), meters (m), kilometers (km), inches (in), feet (ft), yards (yd), and miles (mi)—perfect for construction, travel planning, and everyday measurements. Weight/mass conversions cover milligrams (mg), grams (g), kilograms (kg), ounces (oz), pounds (lb), and metric tons—essential for cooking, shipping, and fitness tracking. Temperature conversions handle Celsius (°C), Fahrenheit (°F), and Kelvin (K) using proper conversion formulas rather than simple multiplication factors, ensuring accurate scientific and everyday temperature conversions. Volume conversions include milliliters (ml), liters (L), gallons (gal), quarts (qt), pints (pt), cups, and fluid ounces (fl oz)—ideal for cooking, chemistry, and liquid measurements. Area conversions support square millimeters (mm²), square centimeters (cm²), square meters (m²), square kilometers (km²), square inches (in²), square feet (ft²), square yards (yd²), square miles (mi²), acres, and hectares—perfect for real estate, land measurement, and construction. Speed conversions include meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), and knots—useful for automotive, aviation, and sports applications. Time conversions cover milliseconds (ms), seconds (s), minutes (min), hours (h), days, weeks, months, and years—helpful for project planning, scientific calculations, and everyday scheduling. All conversions happen instantly in your browser as you type, with real-time updates and no need to click any buttons. The tool displays the conversion formula for educational purposes, showing exactly how each conversion is calculated. The swap button allows you to quickly reverse the from/to units for bidirectional conversions. All processing happens entirely client-side using JavaScript, ensuring complete privacy—your data never leaves your device or gets sent to any server. Works offline once loaded, compatible with all modern browsers, and completely free with no signup required.