Unit Converter
Convert between any units: inches to centimeters, pounds to kilograms, Fahrenheit to Celsius, gallons to liters, miles to kilometers, and dozens more. Free instant US converter.
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Essential US ↔ Metric Conversions
The US is one of three countries (with Liberia and Myanmar) still primarily using the imperial system. Understanding both systems is practically useful for travel, imported goods, scientific work, and increasingly for fitness and nutrition labels.
| Category | US Unit | Metric Equivalent |
|---|---|---|
| Length | 1 inch | 2.54 cm |
| Length | 1 mile | 1.609 km |
| Weight | 1 pound | 0.454 kg |
| Volume | 1 gallon | 3.785 L |
| Temperature | 32°F | 0°C |
| Temperature | 98.6°F | 37°C |
Why This Matters Financially
Unit conversions affect real money decisions. Gas mileage: a 35 MPG car getting 14.9 km/L. International shipping: rates quoted in kg affect pricing for e-commerce sellers. Real estate internationally: lots measured in hectares (1 acre = 0.405 hectares). Medical dosing: weight-based drug dosing uses kg. Fitness and nutrition: macros and serving sizes often mix metric and imperial. Getting conversions wrong in business contexts can mean significant pricing errors. For currency conversions when traveling internationally, use our Currency Converter.
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