Unit Converter

How to Use the Unit Converter

Select a conversion type from the dropdown menu, enter a numeric value in the input field, and the converter instantly calculates the equivalent in your target unit. Results update in real time as you type, so there is no need to press a button or reload the page. The converter supports length, weight, speed, volume, area, and temperature conversions covering the most commonly needed unit pairs.

All conversions use standard factors recognized by the International System of Units (SI) and the US customary system. Temperature conversions use the exact formulas rather than simple multiplication factors, so Celsius-to-Fahrenheit and Celsius-to-Kelvin results are always precise.

Common Conversion Factors

Here are some of the most frequently used conversion factors included in this tool:

• Length: 1 meter = 3.28084 feet, 1 kilometer = 0.621371 miles, 1 inch = 2.54 centimeters
• Weight: 1 kilogram = 2.20462 pounds, 1 ounce = 28.3495 grams
• Speed: 1 km/h = 0.621371 mph, 1 m/s = 3.6 km/h
• Volume: 1 liter = 0.264172 US gallons, 1 US gallon = 3.78541 liters
• Area: 1 m² = 10.7639 ft², 1 hectare = 2.47105 acres

Temperature Conversion Formulas

Temperature is unique because it does not use a simple multiplication factor. The formulas are:

• Celsius to Fahrenheit: °F = (°C × 9/5) + 32
• Fahrenheit to Celsius: °C = (°F − 32) × 5/9
• Celsius to Kelvin: K = °C + 273.15
• Kelvin to Celsius: °C = K − 273.15

Kelvin is the SI base unit for temperature. It uses the same increment size as Celsius but starts at absolute zero (−273.15 °C), the lowest possible temperature where all molecular motion ceases.

Tips for Accurate Conversions

Always double-check which unit system you are working in. Mixing metric and imperial units without converting is one of the most common sources of error in science, engineering, and everyday life. When precision matters, use as many decimal places as the converter provides. For rough estimates, rounding to two or three significant figures is usually sufficient. If you need a conversion pair not listed here, try chaining two conversions together. For example, convert yards to meters first, then meters to feet.

Frequently Asked Questions

How do I convert meters to feet?

Multiply the number of meters by 3.28084 to get the equivalent in feet. For example, 10 meters equals 32.8084 feet. You can also use this converter to do it instantly.

What is the formula to convert Celsius to Fahrenheit?

The formula is °F = (°C × 9/5) + 32. For example, 25 °C equals (25 × 9/5) + 32 = 77 °F. To convert the other way, use °C = (°F − 32) × 5/9.

How many kilograms are in a pound?

One pound equals approximately 0.453592 kilograms. Conversely, one kilogram equals approximately 2.20462 pounds.

What is the difference between a US gallon and a liter?

One US gallon equals approximately 3.78541 liters. One liter equals approximately 0.264172 US gallons. Note that an imperial (UK) gallon is larger at about 4.546 liters.

How do I convert km/h to mph?

Divide the speed in km/h by 1.60934 to get mph. For example, 100 km/h equals approximately 62.14 mph. Alternatively, multiply mph by 1.60934 to convert to km/h.