Convert Units
Conversion Result
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| Common Conversions | Result |
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Formula:
Convert between units instantly and accurately. Temperature, length, weight, volume, speed, and more. Real-time calculations with instant results. Completely free and 100% private.
Unit conversion is one of the most common tasks in daily life and professional work. Whether you're cooking (ounces to grams), traveling (miles to kilometers), or doing scientific work (Fahrenheit to Celsius), accurate unit conversion is essential. Manual calculations are error-prone and time-consuming—a good converter eliminates mistakes instantly.
Why is unit conversion important? Different countries use different measurement systems. The US uses imperial units (miles, pounds, Fahrenheit), most of the world uses metric (kilometers, kilograms, Celsius). Scientists use additional units. Traveling, cooking, shopping, and professional work all require instant accurate conversions.
Common conversion categories:
How conversion works: Each unit has a defined relationship to other units. For example, 1 kilometer = 0.621371 miles. To convert, you multiply by the conversion factor. This converter handles all the math instantly—just enter your value and select units.
| Common Conversions | Result |
|---|
Formula:
| From | To | Factor |
|---|---|---|
| 1 Kilometer | Miles | 0.621371 |
| 1 Kilogram | Pounds | 2.20462 |
| 1 Liter | Gallons (US) | 0.264172 |
| 1 Square Meter | Square Feet | 10.764 |
| 100 Celsius | Fahrenheit | 212°F |
Both measure temperature but use different scales. Celsius: water freezes at 0°, boils at 100°. Fahrenheit: water freezes at 32°, boils at 212°. Celsius is metric (used globally), Fahrenheit is mainly used in the USA. Conversion: °F = (°C × 9/5) + 32.
Historical reasons. Most countries adopted the metric system in the 1800s (easier to calculate, based on 10). The US kept imperial units for practical reasons (feet/inches matched natural proportions for construction). Today, metric is the international standard, but imperial persists in the US, UK, and some older measurements.
Very accurate. Uses standard SI conversion factors (internationally accepted). Results are correct to many decimal places. For practical purposes (cooking, travel, work), this is perfectly accurate. For precision scientific work, specify decimal places needed.
Kelvin is the absolute temperature scale used in science. 0 K = -273.15°C (absolute zero, lowest possible temperature). No negative numbers. Science uses Kelvin because it's proportional (doubling K means doubling molecular motion). Regular people use Celsius/Fahrenheit; scientists use Kelvin.
No. There are two main pounds: Pound-force (lbf) used in physics, and Pound-mass (lbm) used in weight. For everyday use, when you say "pound" you mean weight. In the US: 1 lb ≈ 0.453592 kg. For recipes, always use weight-based measurements (grams/ounces) not volume.
Use weight conversions for accuracy: 1 cup flour ≈ 125g, 1 cup sugar ≈ 200g, 1 tablespoon ≈ 15ml. Volume conversions (cups/ml) are less reliable because density differs by ingredient. For baking especially, use grams if possible—weight is more precise than volume.
Yes, 100% private. All conversions happen in your browser. We never see, store, or collect your conversion data. No login required, no tracking, no ads. Your data stays completely private.
Scenario: Road trip in Canada is 500 miles. How many kilometers?
Conversion: 500 miles × 1.60934 = 804.67 km
Scenario: Recipe says bake at 375°F, your oven uses Celsius. What temp?
Conversion: (375 - 32) × 5/9 = 190.5°C (set to 190°C or 200°C)
Scenario: Need 2 kg flour but recipe shows 4.4 lbs. Is that right?
Conversion: 2 kg × 2.20462 = 4.4 lbs (perfect match!)