Imperial To Metric Conversion
Easily convert imperial units like inches, feet, pounds, gallons, and Fahrenheit to metric equivalents. Free online converter for everyday measurement needs.
About This Calculator
The Imperial To Metric Conversion calculator is a versatile tool that converts common imperial units to their metric equivalents across four measurement categories: length, weight, volume, and temperature. Whether you are a student solving science problems, a traveler navigating different measurement systems, a cook following international recipes, or a professional working in engineering or construction, this converter provides instant and accurate results.
For length conversions, the calculator handles inches to centimeters, feet to meters, yards to meters, and miles to kilometers. Weight conversions cover ounces to grams, pounds to kilograms, and stones to kilograms. Volume conversions include fluid ounces to milliliters, pints to liters, quarts to liters, and gallons to liters. For temperature, it converts Fahrenheit to Celsius using the standard formula (°F - 32) × 5/9.
Each conversion displays the result alongside a full breakdown showing the entered value expressed in every unit within the same category. For example, converting 5 feet shows the equivalent in millimeters, centimeters, meters, kilometers, inches, yards, and miles. This comprehensive view helps you understand the relationship between all units.
The tool also includes an interactive chart that visualizes the unit equivalents as a bar chart, making it easy to compare values across different measurement scales. Results are shareable via URL parameters — simply copy the URL after converting to share the exact conversion with others.
Regional Notes
United States: The US is the only major country still using imperial units for most everyday measurements. Height is measured in feet and inches, body weight in pounds, distance in miles, and cooking volume in cups and fluid ounces. This converter is essential for US users working with international (metric) standards.
United Kingdom: The UK uses a hybrid system — road distances in miles and speed in mph, but Celsius for temperature and kilograms for most grocery items. Body weight is often measured in stones and pounds, while beer and milk are sold in pints. This converter handles all UK imperial units.
India: India officially uses the metric system for all scientific, commercial, and educational purposes. However, some imperial units persist informally: height in feet and inches, land area in square feet, and body weight occasionally in kilograms mixed with pounds. This converter helps Indians interpret imperial measurements from international sources.
Frequently Asked Questions
How do you convert inches to centimeters?
To convert inches to centimeters, multiply the inch value by 2.54. For example, 1 inch = 2.54 cm, 12 inches = 30.48 cm. Our calculator handles this instantly for any value.
How do you convert Fahrenheit to Celsius?
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit value, then multiply by 5/9. For example, 212°F = 100°C (boiling point) and 32°F = 0°C (freezing point).
How many centimeters are in an inch?
There are exactly 2.54 centimeters in one inch. This is the standard international conversion factor defined since 1959.
How do you convert pounds to kilograms?
To convert pounds to kilograms, divide the pound value by 2.20462. For example, 1 lb = 0.4536 kg, 10 lb = 4.536 kg, and 100 lb = 45.36 kg.
How do you convert gallons to liters?
One US gallon equals 3.78541 liters. To convert gallons to liters, multiply the gallon value by 3.78541. The UK (imperial) gallon is larger at 4.54609 liters, but our calculator uses the US gallon by default.
Is this imperial to metric converter free?
Yes, all calculators on Calculy are completely free to use. No registration, no hidden fees, and no usage limits. Simply enter your values and get instant metric conversions.
Which countries use imperial units?
The United States is the primary user of imperial units for everyday measurements. The United Kingdom uses a mix of imperial (miles, pints, stone for body weight) and metric. Most other countries use the metric system exclusively.
What is the formula to convert feet to meters?
One foot equals exactly 0.3048 meters. To convert feet to meters, multiply the foot value by 0.3048. For example, 10 feet = 3.048 meters, and 100 feet = 30.48 meters.