Unit Conversion Calculator USA
Convert seamlessly between US Customary and Metric (SI) units for length, weight, temperature, fluid volume, area, speed, data storage, energy, pressure, and fuel economy.
Universal Unit Converter
Enter a numeric value, select your starting unit and target unit to calculate instant real-time conversions.
Conversion Result
Common US Customary to Metric Conversion Tables
Use these cheat sheets for quick everyday unit conversion lookup across common US standards.
1. Length & Distance Conversion Table
| US Customary Unit | Metric Equivalent | Exact Formula |
|---|---|---|
| 1 Inch (in) | 2.54 Centimeters (cm) | 1 in = 2.54 cm |
| 1 Foot (ft) | 0.3048 Meters (m) | 1 ft = 12 in = 0.3048 m |
| 1 Yard (yd) | 0.9144 Meters (m) | 1 yd = 3 ft = 0.9144 m |
| 1 Mile (mi) | 1.60934 Kilometers (km) | 1 mi = 5,280 ft = 1.60934 km |
2. Weight & Mass Conversion Table
| US Customary Unit | Metric Equivalent | Exact Formula |
|---|---|---|
| 1 Ounce (oz) | 28.3495 Grams (g) | 1 oz = 28.3495 g |
| 1 Pound (lb) | 0.453592 Kilograms (kg) | 1 lb = 16 oz = 0.453592 kg |
| 1 US Short Ton (ton) | 907.185 Kilograms (kg) | 1 ton = 2,000 lbs = 907.185 kg |
| 1 Metric Ton (t) | 2,204.62 Pounds (lbs) | 1 t = 1,000 kg = 2,204.62 lbs |
3. Key Temperature Benchmarks (°F vs °C)
| Benchmark / Standard | Fahrenheit (°F) | Celsius (°C) | Kelvin (K) |
|---|---|---|---|
| Absolute Zero | -459.67 °F | -273.15 °C | 0 K |
| Water Freezing Point | 32 °F | 0 °C | 273.15 K |
| Room Temperature | 68 °F – 72 °F | 20 °C – 22.2 °C | 293.15 K |
| Human Body Temperature | 98.6 °F | 37 °C | 310.15 K |
| Water Boiling Point (Sea level) | 212 °F | 100 °C | 373.15 K |
Understanding Unit Conversions: US Customary vs. Metric System
The United States primarily utilizes the US Customary System for everyday measurements, commercial trade, construction, and highway signage (miles, feet, pounds, Fahrenheit, and US gallons). Conversely, the majority of global trade, scientific research, international logistics, and medicine rely on the International System of Units (SI Metric System).
Why Accurate Unit Conversion Matters
Whether you are cooking a European recipe using grams and milliliters, calculating vehicle speed in kilometers per hour during international travel, calculating luggage weights for international flights, or solving physics equations, precise mathematical conversion prevents errors and ensures complete accuracy.
How Temperature Conversions Work
Unlike length or mass, temperature scales do not share a zero starting point. Water freezes at 32°F on the Fahrenheit scale, but 0°C on the Celsius scale.
- Fahrenheit to Celsius: Subtract 32 from the Fahrenheit temperature, then multiply by 5/9 (or divide by 1.8):
°C = (°F − 32) × 5/9 - Celsius to Fahrenheit: Multiply the Celsius temperature by 9/5 (or 1.8), then add 32:
°F = (°C × 9/5) + 32 - Celsius to Kelvin: Add 273.15:
K = °C + 273.15
Frequently Asked Questions (FAQs)
A: A US liquid gallon is equal to 3.78541 Liters (128 US fl oz), whereas a UK Imperial gallon is larger, equaling 4.54609 Liters (160 UK fl oz). This calculator defaults to the standard US Liquid Gallon.
A: A quick mental estimate is to divide the weight in pounds by 2, then subtract 10% from that result. For example, 200 lbs ÷ 2 = 100; 100 − 10 = 90 kg (exact value is 90.718 kg).
A: No. A standard US statute mile is 5,280 feet (1,609.34 meters), whereas a nautical mile is based on one minute of arc along the Earth's meridian, equaling 6,076.12 feet (1,852 meters).