Imperial to Metric Conversion Calculator
Enter a value, choose an imperial unit, and get the metric equivalent instantly.
Tip: press Enter in the value field to calculate quickly.
- 1 inch = 2.54 cm
- 1 mile = 1.609344 km
- 1 pound = 0.45359237 kg
- °C = (°F − 32) × 5/9
Why Use an Imperial to Metric Converter?
If you work with international measurements, conversion errors can be expensive and frustrating. Recipes, shipping dimensions, engineering drawings, gym tracking, and travel distances are often listed in different unit systems. A reliable imperial to metric converter helps you move fast and stay accurate.
The tool above converts common imperial units (inches, feet, miles, pounds, gallons, Fahrenheit, and more) into their metric equivalents in one click.
Most Common Imperial to Metric Conversions
Length
- Inches to centimeters (in → cm)
- Feet to meters (ft → m)
- Yards to meters (yd → m)
- Miles to kilometers (mi → km)
Weight and Mass
- Ounces to grams (oz → g)
- Pounds to kilograms (lb → kg)
- Stone to kilograms (st → kg)
- US short ton to metric tonne (ton → t)
Volume and Temperature
- Fluid ounces to milliliters (fl oz → mL)
- Pints, quarts, gallons to liters (pt/qt/gal → L)
- Fahrenheit to Celsius (°F → °C)
How the Calculator Works
For most units, the conversion is a straightforward multiplication by a fixed factor:
- Metric value = Imperial value × conversion factor
Temperature is special because it includes an offset, not just scaling:
- °C = (°F − 32) × 5/9
Practical Examples
Example 1: Running Distance
A race is 6.2 miles. Converted to metric, that's about 9.98 km, usually rounded to 10 km.
Example 2: Body Weight
A weight of 180 pounds converts to approximately 81.65 kilograms.
Example 3: Weather
If a forecast shows 77°F, the metric equivalent is 25°C.
Tips for Better Conversion Accuracy
- Use decimals for precise input values (e.g., 2.75 feet).
- Only round at the final step when needed for display.
- Double-check whether volume values are US or UK imperial units.
- For engineering and science, keep more decimal places.
Final Thoughts
Whether you're converting inches to centimeters, pounds to kilograms, or Fahrenheit to Celsius, a dependable imperial to metric conversion calculator saves time and reduces mistakes. Bookmark this page for quick daily use at home, at work, or in the classroom.