Convert between length, weight, and temperature units. Supports metric and imperial systems in a single tool.
Unit conversion is the process of converting a quantity expressed in one unit of measurement to another unit. Different countries and industries use different measurement systems — the metric system (meters, kilograms, Celsius) and the imperial system (feet, pounds, Fahrenheit) being the most common. Converting between these systems can be confusing and error-prone, especially when dealing with unfamiliar units. Our Unit Converter simplifies this by supporting lengths, weights, and temperatures with a single, easy-to-use interface that handles all the complex conversion formulas for you.
Using our Unit Converter is straightforward. First, select the category you want to convert — Length, Weight, or Temperature. Enter the value you wish to convert in the "Value" field. Choose the unit you are converting from in the "From" dropdown, and the unit you want to convert to in the "To" dropdown. The result appears instantly in the "Result" field. Available units include meters, kilometers, miles, feet, inches for length; kilograms, grams, pounds, ounces for weight; and Celsius, Fahrenheit, Kelvin for temperature.
Our Unit Converter offers multiple advantages in a single tool. Instead of switching between different converters for different types of measurements, you get length, weight, and temperature conversions all in one place. The tool updates results in real time as you adjust any input, making it fast and efficient. All processing happens in your browser, so your data never leaves your device. Whether you are a student working on homework, a professional in engineering or construction, or someone following a recipe with unfamiliar units, this converter handles it instantly and accurately.
Keep this handy reference table for the most frequently used everyday conversions between metric and imperial systems.
| Category | Conversion | Formula |
|---|---|---|
| Length | 1 inch = 2.54 cm | cm = in × 2.54 |
| Length | 1 mile = 1.609 km | km = mi × 1.609 |
| Length | 1 foot = 0.305 m | m = ft × 0.305 |
| Weight | 1 pound = 0.454 kg | kg = lb × 0.454 |
| Weight | 1 ounce = 28.35 g | g = oz × 28.35 |
| Temperature | 0°C = 32°F | F = (C × 9/5) + 32 |
| Temperature | 100°C = 212°F | C = (F - 32) × 5/9 |
Maria is baking a New York cheesecake recipe that calls for 2 pounds of cream cheese, 1 cup of sugar (7 ounces by weight), and an oven temperature of 350°F. In her European kitchen, her scale measures in grams and her oven uses Celsius. Using our Unit Converter, she converts 2 pounds to approximately 907 grams of cream cheese, 7 ounces to about 198 grams of sugar, and 350°F to 177°C for the oven. Without the converter, she might have guessed at the oven temperature or used the wrong weight conversion, potentially ruining the dessert.
David is driving from Paris to Berlin, a distance of 1,050 kilometers. As an American accustomed to miles, he wants to understand the trip in familiar units. Using the converter, 1,050 km equals approximately 652 miles. He calculates that at an average highway speed of 75 mph (120 km/h), the drive will take roughly 8.5 to 9 hours without breaks. When planning fuel stops, he also converts the 60-liter fuel tank capacity to about 15.9 gallons, helping him estimate that he will need to refuel twice during the approximately 652-mile journey.
Sarah, who recently moved from the UK to Canada, set a fitness goal of losing 5 kilograms. Her bathroom scale at home measures in kilograms, but her fitness app and online health resources primarily use pounds. Using the converter, she learns that 5 kg equals about 11 pounds. Her starting weight of 75 kg converts to approximately 165 pounds. To track her progress, she records her weekly weigh-ins in both units: 73 kg becomes 161 pounds, and her goal of 70 kg equals 154 pounds. This dual-unit tracking helps her follow international fitness communities and health guidelines seamlessly.
The metric system is the official measurement system in nearly every country worldwide, with only the United States, Myanmar, and Liberia using the imperial system as their primary standard. The United Kingdom uses a mix of both systems: miles for road distances, but meters and kilograms for most other measurements. Canada officially uses metric, though many Canadians still use imperial measurements for certain everyday purposes like height and cooking.
A simple mental approximation: double the Celsius temperature, subtract 10%, and add 32. For example, 25°C becomes 25 × 2 = 50, minus 5 = 45, plus 32 = 77°F (close to the exact 77°F). For a quick rough estimate, just double the Celsius and add 30: 25°C × 2 + 30 = 80°F (approximate). The exact formula is F = (C × 9/5) + 32, so use our converter when precision matters.
The imperial system developed organically over centuries based on everyday measurements (a foot was literally the length of a king's foot, an inch was the width of a thumb). The metric system was designed during the French Revolution as a rational, decimal-based system where units are related by factors of 10. Most countries adopted the metric system due to its consistency and ease of use in science, trade, and industry, while the US retained imperial due to the cost and disruption of a large-scale conversion.
The International System of Units (SI) is the modern form of the metric system and the world's most widely used system of measurement. It defines seven base units: meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). All other units are derived from these seven base units. The SI system is used universally in science, medicine, and most international commerce.
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