Metric to Imperial Converter

Switching between metric and imperial units shows up everywhere, from reading a recipe to spec'ing a part for an overseas supplier. Fluency in both systems is a practical necessity, and a single bad conversion can throw off a manufacturing run, a construction estimate, or a weekend project that depended on getting the numbers right.

Conversions run on the factors in NIST's Guide to the SI (Special Publication 811), where the inch (2.54 cm), foot (0.3048 m), yard (0.9144 m) and mile (1.609344 km) are exact by definition. Length uses 1 inch = 2.54 cm and 1 meter = 3.28084 feet; weight uses 1 pound = 0.453592 kg and 1 kg = 2.20462 pounds. Volume relies on 1 US gallon = 3.78541 liters and 1 liter = 0.264172 US gallons, while temperature follows °F = (°C × 9/5) + 32 and °C = (°F - 32) × 5/9.

Watch which imperial unit you're targeting, since US customary and British imperial values diverge on measures like the gallon: this converter's gallons, pints, cups and fluid ounces are US measures (1 US gallon = 3.785 L), while an imperial gallon is 4.546 L. Significant figures deserve attention too: the converter returns precise numbers, but physical measurements carry their own limits of accuracy, and rounding can compound when you chain several conversions back to back.