Free Unit Converter Online

Our converter supports 6 major categories: Length (mm, cm, m, km, inches, feet, yards, miles), Weight (mg, g, kg, ounces, pounds, tons), Temperature (Celsius, Fahrenheit, Kelvin), Area (square meters, square feet, acres, hectares), Volume (ml, liters, gallons, cubic meters), and Time (seconds, minutes, hours, days, weeks, months, years).

Our conversions use precise mathematical formulas and standard conversion factors. For most units, accuracy is to 6+ decimal places. However, some conversions (like temperature) use exact formulas, while others may have slight rounding for display purposes.

Yes! You can convert between metric and imperial systems, as well as between different scales within the same system. For example, you can convert from meters to feet, or from Celsius to Fahrenheit.

Metric system uses base-10 units (meters, grams, liters) and is used worldwide. Imperial system uses traditional units (feet, pounds, gallons) and is primarily used in the US. Our converter handles both systems seamlessly.

Click the swap button (↔) to instantly exchange the 'from' and 'to' values and units. This is useful when you need to convert in the opposite direction without manually changing all the fields.

Yes, our converter handles a wide range of values from very small (like micrometers) to very large (like light-years). The tool automatically formats large numbers with appropriate notation for readability.

Temperature conversions use specific formulas: Celsius to Fahrenheit: F = (C × 9/5) + 32, Fahrenheit to Celsius: C = (F - 32) × 5/9, Kelvin conversions: K = C + 273.15. These are exact mathematical relationships.

Yes, we use the latest international standards and definitions. For example, we use the current definition of the meter, kilogram, and other SI base units as established by international organizations.