Unit Converter

Free Online Unit Converter

Converting between different units of measurement is a daily need for students, engineers, cooks, travelers, and professionals across every industry. This unit converter supports five categories: Length (meters, kilometers, miles, feet, inches, centimeters, millimeters, yards, nautical miles), Weight/Mass (kilograms, grams, pounds, ounces, tons, milligrams, stones), Temperature (Celsius, Fahrenheit, Kelvin), Area (square meters, square kilometers, square miles, square feet, acres, hectares), and Volume (liters, milliliters, gallons, quarts, pints, cups, fluid ounces, cubic meters). Simply select a category, choose the source and target units, enter a value, and see the result instantly. The conversion logic uses precise conversion factors stored locally in your browser — no server calls are made.

How Unit Conversions Work

Each category uses a base unit for internal calculations. For length, the base is meters. For weight, it's kilograms. For temperature, formulas directly convert between scales. For area, it's square meters. For volume, it's liters. When you enter a value, it is first converted to the base unit, then to the target unit. This two-step approach minimizes conversion factors and ensures accuracy. Temperature conversions use the standard formulas: Celsius to Fahrenheit multiplies by 9/5 and adds 32, Kelvin subtracts 273.15 from Celsius. All calculations use JavaScript's native floating-point arithmetic with appropriate rounding for display.