Universal Unit Converter

Complete unit conversions across 13 categories at once: enter a value in any unit, and all values update in real-time. Supports quick presets, precision control, and conversion history. All calculations are done locally in your browser.

⚡ Quick Conversions:

🎯 Precision

📐 Conversion Formulas

Unit

Symbol

Value

📜 Recent Conversions

No conversion history

About Universal Unit Converter

Universal Unit Converter is an online tool that helps you quickly and accurately convert between 105 units across 13 categories. All calculations are done locally in your browser — no data is uploaded to any server.

Supported Categories

Length — Nanometer (nm), Micrometer (μm), Millimeter (mm), Centimeter (cm), Decimeter (dm), Meter (m), Kilometer (km), Inch (in), Foot (ft), Yard (yd), Mile (mi), Nautical Mile (nmi)
Weight/Mass — Milligram, Gram, Kilogram, Metric Ton, Ounce, Pound, Chinese Jin, Chinese Liang, Chinese Qian, Carat, Stone
Temperature — Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°Ra), Réaumur (°Re)
Area — Square Millimeter (mm²) to Square Kilometer (km²), Hectare (ha), Chinese Mu (亩), Square Foot (sq ft), Acre (ac), Square Mile (sq mi)
Volume — Milliliter, Liter, Cubic Meter, Cubic Foot, Gallon (US/UK), Pint, Quart, Fluid Ounce
Time — Millisecond (ms), Second (s), Minute (min), Hour (h), Day (d), Week (wk), Month (mo), Year (yr)
Speed — Meter/Second (m/s), Kilometer/Hour (km/h), Mile/Hour (mph), Knot (kn), Mach
Pressure — Pascal (Pa), Kilopascal (kPa), Megapascal (MPa), Bar (bar), Atmosphere (atm), PSI (psi), Millimeter of Mercury (mmHg)
Power — Watt (W), Kilowatt (kW), Megawatt (MW), Horsepower Metric/Imperial (hp), BTU/Hour (BTU/h)
Data Storage — bit, Byte (B), KB, MB, GB, TB, PB (with binary KiB/MiB/GiB)
Angle — Degree (°), Radian (rad), Gradian (gon), Turn
Force — Newton (N), Kilonewton (kN), Kilogram-force (kgf), Pound-force (lbf), Dyne (dyn)
Energy — Joule (J), Kilojoule (kJ), Megajoule (MJ), Calorie (cal), Kilocalorie (kcal), Kilowatt-hour (kWh), BTU

Why Choose This Tool?

All Units Sync — Enter a value in any unit, all values in the same category update in real-time
Bidirectional Conversion — Click any unit's input to modify it directly; any unit can be the source
Quick Presets — Each category has preset common conversions for one-click use
Adjustable Precision — Supports 0-10 decimal places, meeting precision needs from daily to scientific use
Conversion History — Automatically saves the last 20 conversion records for easy review
Privacy & Security — All calculations are done client-side, no data is uploaded to any server

Tips: Enter a value in any unit's input field, and all other units will auto-sync. Click the 📋 button on the right of a unit row to copy that value. Temperature category shows conversion formulas at the bottom for reference.