Unit Converter
Convert between hundreds of units of length, weight, temperature, volume, speed, and more.
About Unit Converter
A unit converter is a versatile tool that converts measurements between different unit systems, including metric (SI), imperial (US customary), and other specialized units. Unit conversion is fundamental in science, engineering, cooking, travel, and everyday life. Whether you are converting kilometers to miles for a road trip, Celsius to Fahrenheit for a recipe, or kilograms to pounds for shipping, this tool provides instant and accurate conversions across dozens of measurement categories.
How to Use
Select the measurement category (length, weight, temperature, volume, speed, area, etc.), then choose the source unit and target unit from the dropdown menus. Enter the value you want to convert, and the result appears instantly. You can also swap the source and target units with one click to reverse the conversion.
Formula / Key Equations
Each conversion uses a precise multiplication factor or formula. For example, 1 inch = 2.54 centimeters (exact), 1 pound = 0.45359237 kilograms (exact), and temperature conversions use the formulas: F = (C × 9/5) + 32, C = (F - 32) × 5/9, K = C + 273.15.
Common Use Cases
Common scenarios include: converting recipe measurements between metric and imperial, calculating shipping weights, understanding speed limits when traveling abroad, converting fuel efficiency (mpg to L/100km), determining clothing sizes across international sizing systems, and converting construction measurements between feet/meters and square feet/square meters.
Limitations
The converter handles standard units with high precision. It does not support ancient or obscure measurement units, real-time currency conversion (exchange rates change constantly), or extremely large numbers beyond standard JavaScript floating-point limits. For scientific applications requiring SI prefix conversions (nano, micro, mega, giga), results are accurate within standard precision.
Frequently Asked Questions
How accurate are the conversions?
Conversions use internationally defined conversion factors with full floating-point precision. Length, mass, and temperature conversions are exact (defined by international agreements). The displayed results are typically rounded to 6 significant figures.
Does the unit converter work offline?
Yes, all conversions are calculated in your browser using built-in conversion factors. No internet connection is needed once the page has loaded.
Can I convert currency?
This tool handles measurement units, not currency. Currency conversion requires real-time exchange rates that change constantly. For currency, use a dedicated currency converter with live rates.
What is the difference between metric and imperial?
The metric system (SI) is based on powers of 10 and used worldwide — meters, kilograms, liters. The imperial/US customary system uses feet, pounds, gallons and is primarily used in the United States. Our converter bridges both systems seamlessly.
How many unit categories are supported?
The converter supports length, weight/mass, temperature, volume, speed, area, time, data/digital storage, and pressure. Each category includes multiple units within that measurement type.
Related Tools
Percentage Calculator
Calculate percentages, percentage change, increase...
Tip Calculator
Split bills and calculate tips easily. Supports cu...
Age Calculator
Calculate your exact age in years, months, days, h...
Date Calculator
Add or subtract days, weeks, months from a date. C...
Length Converter
Convert between meters, feet, inches, kilometers, ...
Weight Converter
Convert between kilograms, pounds, ounces, grams, ...