Unit Converter - Free Online Tool | PivaBox

Convert between units of length, weight, temperature, area, volume

Unit Converter — Convert Length, Weight, Temperature, Area, Volume, Speed, and More

1. Select the measurement category: Length (meter, foot, inch, mile, kilometer), Weight (kilogram, pound, ounce), Temperature (Celsius, Fahrenheit, Kelvin), Area (sq meter, sq foot, acre, hectare), Volume (liter, gallon, cup), Speed (km/h, mph, m/s), and more.
2. Enter a numeric value in any unit. The converter instantly calculates and displays the equivalent in all other units within that category. Change any value and all conversions update in real time.
3. Copy any converted value or use the tool as a quick reference. The conversion factors follow international standards (SI, imperial, and US customary units).

Frequently Asked Questions

Is the Unit Converter free?

Yes, completely free. Convert unlimited values across all measurement categories with no restrictions.

Are my conversion data uploaded anywhere?

No. All conversions are calculated locally in your browser. Your data never leaves your device.

How accurate are the conversions and what measurement systems are supported?

All conversions use high-precision conversion factors defined by international standards (NIST, BIPM). The tool supports the International System of Units (SI / metric), US customary units, and British imperial units. Key conversion categories: Length (mm, cm, m, km, inch, foot, yard, mile, nautical mile), Weight/Mass (mg, g, kg, ton, oz, lb, stone), Temperature (Celsius, Fahrenheit, Kelvin — note that °C and K have the same interval size but offset by 273.15), Area (sq mm to sq mile, including acre and hectare), Volume (mL, L, gallon US, gallon UK, quart, pint, cup, fluid ounce, tablespoon, teaspoon), Speed (m/s, km/h, mph, knot), plus Data Size (bit, byte, KB, MB, GB, TB) and Time. Temperature is the only category where conversion is non-linear (multiplication + offset); all others use simple multiplication factors.