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Unit Converter

Convert between units of length, weight, volume, temperature, speed, and more. Supports metric and imperial.

Unit Converter

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Unit Conversion: A Complete Guide

Unit conversion is the process of changing a measurement from one unit to another without changing the actual quantity. Whether you are cooking with a recipe from another country, working on a science problem, or traveling abroad, the ability to convert between units quickly is invaluable.

The Metric System vs. Imperial System

The metric system (International System of Units, or SI) is used by the vast majority of the world. It is based on powers of 10, making conversions within the system straightforward: 1 kilometer = 1,000 meters, 1 kilogram = 1,000 grams, and so on. The imperial system, still commonly used in the United States, Liberia, and Myanmar, uses units like inches, feet, pounds, and gallons with less predictable conversion factors.

Common Conversion References

Length: 1 inch = 2.54 cm, 1 mile = 1.609 km, 1 foot = 30.48 cm
Weight: 1 pound = 0.4536 kg, 1 ounce = 28.35 g, 1 stone = 14 pounds
Temperature: °F = (°C × 9/5) + 32, 0°C = 32°F, 100°C = 212°F
Volume: 1 US gallon = 3.785 liters, 1 cup = 236.6 ml
Area: 1 acre = 43,560 sq ft = 4,047 sq m
Speed: 1 mph = 1.609 km/h, 1 knot = 1.151 mph
Digital: 1 KB = 1,024 bytes, 1 MB = 1,024 KB, 1 GB = 1,024 MB

Temperature Conversion

Temperature is unique because the scales do not share a zero point, so conversion requires both multiplication and addition. The key formulas are:

°F = (°C × 9/5) + 32
°C = (°F - 32) × 5/9
K = °C + 273.15

Some easy reference points: water freezes at 0°C / 32°F / 273.15 K, and boils at 100°C / 212°F / 373.15 K. Body temperature is approximately 37°C / 98.6°F.

Digital Storage Units

Digital storage uses binary prefixes where each step is a factor of 1,024 (2¹&sup0;), not 1,000. This means 1 GB is actually 1,073,741,824 bytes. Some standards use "gibibyte" (GiB) for the binary value and "gigabyte" (GB) for the decimal value (1,000,000,000 bytes), but in practice most operating systems and this calculator use the binary definition.

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How to Use the Unit Converter

1
Enter your values
Open the Unit Converter and fill in the required input fields with your numbers or selections.
2
Review the calculation
The tool automatically computes the result as you type. Double-check your inputs to ensure accuracy.
3
Interpret your results
Review the calculated output along with any breakdowns, charts, or explanations provided to understand what the numbers mean for your situation.

Sources & Verification

NIST ISO

Published by ConvertCrunch Editorial Team | Our Methodology

Frequently Asked Questions

What is the Unit Converter?

The Unit Converter is a free browser-based tool on ConvertCrunch. Convert between units of length, weight, volume, temperature, speed, and more. Supports metric and imperial. It requires no downloads, installations, or account signups. Simply enter your values and get instant, accurate results. The tool is designed for quick calculations and informed decision-making, whether you are a professional, student, or everyday user looking for reliable answers.

How do I use the Unit Converter?

Using the Unit Converter is straightforward. Enter your values into the input fields provided on the page, then calculate or adjust parameters to explore scenarios. Most processing happens locally in your browser. If a feature uses a third-party service, the tool identifies that connection and the privacy policy explains it. Most users get the answers they need in under a minute.

Is the Unit Converter free to use?

Yes, the Unit Converter is completely free to use with no account signup, email requirement, or premium tier. Most calculations run locally in your browser. Features that depend on live data or a third-party service require a network connection and are identified in the tool. You can use it as many times as you need for personal, educational, or professional purposes.

How accurate is the Unit Converter?

The Unit Converter uses standard conversion factors and formulas from authoritative sources. For unit conversions, results are mathematically precise. For tools relying on external data (such as currency rates), values are updated regularly but may have a short lag compared to real-time market data. Results are suitable for everyday use, planning, and quick reference.

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