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Unit Converter

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How to use the Unit Converter?

The Unit Converter supports four major categories essential for everyday life: Length (kilometers, miles, meters, feet, centimeters, inches, yards), Weight (kilograms, pounds, grams, ounces, metric tons), Temperature (Celsius, Fahrenheit, Kelvin), and Volume (liters, US gallons, UK gallons, milliliters, fluid ounces, cups). With over 30 unit pairs covered, it handles both the metric system used by most of the world and the imperial system common in the United States.

Converting units is a daily necessity across science, cooking, fitness, travel, and engineering. Knowing your weight in pounds when your gym app uses kilograms, understanding a recipe that calls for cups when you measure in milliliters, or calculating fuel efficiency across different unit systems are all common real-world scenarios. Our converter handles bidirectional conversion instantly — enter a value and the result appears without pressing any button. The swap button reverses the direction in one click.

All conversions use internationally standardized SI (Système International) conversion factors from NIST (National Institute of Standards and Technology). Temperature uses the exact formulas: Celsius to Fahrenheit = (C × 9/5) + 32, and Kelvin = C + 273.15. Results are displayed to four decimal places for precision. All calculations run locally in your browser — no data is sent to any server and the tool works offline once the page is loaded.

Frequently Asked Questions

What units can I convert?
The converter supports length (km, miles, meters, feet, cm, inches, yards), weight (kg, lbs, grams, ounces), temperature (Celsius, Fahrenheit, Kelvin), and volume (liters, gallons, ml, fluid ounces, cups) — over 30 unit pairs total.
How accurate is the unit converter?
Results are accurate to four decimal places using standardized SI conversion factors. For temperature, exact mathematical formulas are applied rather than approximations.
Can I convert Celsius to Fahrenheit?
Yes. Select Temperature as the category, choose Celsius as the input unit and Fahrenheit as the output, then enter your value. The formula (C × 9/5) + 32 is applied automatically.
How do I convert miles to kilometers?
Select Length, set miles as the source unit and kilometers as the target. One mile equals exactly 1.60934 km. Enter your mileage and the result appears instantly.
What is the difference between metric and imperial units?
The metric system (SI) is based on powers of 10 and is used by most countries worldwide. The imperial system uses units like miles, pounds, and gallons, and is primarily used in the United States.
Can I use this unit converter on mobile?
Yes. The converter is fully mobile-optimized with a touch-friendly interface. All features work on smartphones and tablets without any app installation.
What is the formula for converting Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. Formula: C = (F − 32) × 5/9. For example, 98.6°F = (98.6 − 32) × 5/9 = 37°C.