Free Online Unit Converter — Complete Guide 2026
Whether you're a student solving physics problems, an engineer working with international specs, a traveler converting miles to kilometers, or a cook converting cups to milliliters — our free online unit converter gives you instant, accurate results for 10+ measurement categories. No app download, no account, no ads blocking your results.
Free Length Converter — Meters, Feet, Miles, Inches & More
Our free length converter handles all common units: meters, centimeters, millimeters, kilometers, inches, feet, yards, and miles. Perfect for construction, travel, and academic use. Common conversions: 1 mile = 1.60934 km, 1 foot = 30.48 cm, 1 inch = 2.54 cm.
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Free Weight Converter — kg to lbs, Grams, Ounces & More
Convert between kilograms, pounds, grams, ounces, milligrams, and metric tons instantly. Our free weight converter is used by fitness enthusiasts tracking body weight, chefs measuring ingredients, and logistics professionals calculating shipping weights. Common conversions: 1 kg = 2.20462 lbs, 1 pound = 453.592 grams.
Free Temperature Converter — Celsius, Fahrenheit & Kelvin
Our free temperature converter converts between Celsius (°C), Fahrenheit (°F), and Kelvin (K) instantly. Essential for cooking, weather, science, and travel. Common conversions: 0°C = 32°F, 100°C = 212°F, 37°C (body temp) = 98.6°F.
Free Speed Converter — km/h, mph, m/s, Knots
Convert speed units including kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), and knots. Our free speed converter is useful for driving, aviation, sports, and physics. Common conversions: 100 km/h = 62.14 mph, 1 knot = 1.852 km/h.
Free Data Size Converter — MB, GB, TB, KB & Bytes
Our free data size converter converts between bytes, kilobytes (KB), megabytes (MB), gigabytes (GB), and terabytes (TB). Essential for developers, IT professionals, and anyone comparing storage devices or file sizes. Common conversions: 1 GB = 1024 MB, 1 TB = 1024 GB.
More Free Unit Converters
- Time Converter: Convert seconds, minutes, hours, days, weeks, months and years.
- Energy Converter: Convert joules, calories, kilocalories, kWh, BTU and more.
- Pressure Converter: Convert PSI, bar, atm, Pascal, mmHg and more.
- Frequency Converter: Convert Hz, kHz, MHz, GHz for electronics and audio.
- Angle Converter: Convert degrees, radians, and gradians for math and engineering.
💡 Pro Tip: Bookmark this page for quick access to all unit converters. All tools work offline once the page is loaded — no internet needed for conversions.