Unit Conversion Calculator

Conversion Type

Value to Convert

From Unit

To Unit

Decimal Precision

Conversion Result

Conversion History

About Unit Conversions

Our unit conversion calculator provides easy and accurate conversions between different units of measurement. Whether you need to convert from metric to imperial units or vice versa, our tool supports a wide range of conversion types:

Length Conversions

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles. Perfect for construction, DIY projects, and international measurements.

1 meter = 3.28084 feet
1 inch = 2.54 centimeters
1 mile = 1.60934 kilometers

Weight Conversions

Convert between milligrams, grams, kilograms, metric tons, ounces, pounds, stone, and US tons. Useful for cooking, shipping, and personal health.

1 kilogram = 2.20462 pounds
1 ounce = 28.3495 grams
1 stone = 14 pounds

Temperature Conversions

Convert between Celsius, Fahrenheit, and Kelvin. Essential for cooking, weather, and scientific applications.

0°C = 32°F = 273.15K
100°C = 212°F = 373.15K
Room temperature: ~20-25°C = ~68-77°F

Volume Conversions

Convert between milliliters, liters, cubic meters, fluid ounces, cups, pints, quarts, and gallons. Perfect for cooking, beverages, and fuel calculations.

1 liter = 33.814 fluid ounces
1 gallon = 3.78541 liters
1 cup = 236.588 milliliters

Pro Tip

For quick access to common conversions, use the "Swap" button to reverse your conversion instantly. You can also adjust the decimal precision for more accurate results when needed.

Related Calculators

Password Generator

Generate secure, random passwords with customizable options for length and character types.

Scientific Calculator

A comprehensive scientific calculator with advanced math functions.

Embed This Calculator

Want to include this Conversion Calculator on your website? Copy and paste the code below:

By embedding, you agree to include the attribution link to Calculators. This embed includes a backlink to our site.

Common Unit Conversion Formulas

Temperature Conversion
From	To	Formula
Celsius	Fahrenheit	°F = (°C × 9/5) + 32
Fahrenheit	Celsius	°C = (°F - 32) × 5/9
Celsius	Kelvin	K = °C + 273.15
Kelvin	Celsius	°C = K - 273.15

Speed Conversion
From	To	Formula
km/h	mph	mph = km/h ÷ 1.60934
mph	km/h	km/h = mph × 1.60934
m/s	km/h	km/h = m/s × 3.6
knots	mph	mph = knots × 1.15078

Our calculator handles all these conversions automatically, but knowing the formulas can help you understand the relationships between different units and measurement systems.

Historical Context of Measurement Systems

The complexity of unit conversions stems from the historical development of measurement systems:

Metric System (SI): Developed during the French Revolution, the metric system is based on powers of 10, making conversions within the system straightforward. It's used by most countries worldwide.
Imperial System: Evolved from earlier English units, the imperial system is still used in the United States and a few other countries. Its conversions are based on historical relationships rather than decimal factors.
US Customary Units: Similar to but distinct from the imperial system, with different definitions for some units like gallons and tons.

Today, most scientific and international commerce relies on the metric system, while everyday use in some countries maintains traditional units. Our conversion calculator bridges these systems, ensuring accurate translations between any combination of units.