Convert between weight units
Our free weight converter instantly converts between all common units of weight and mass including kilograms, pounds, ounces, grams, tons, and more. Essential for cooking, shipping, fitness tracking, science, and international commerce.
Converting weight units is straightforward. Enter the weight value you want to convert, select the source unit (what you're converting from), and choose the target unit (what you're converting to). Click Convert to see the instant result. Our tool handles all common weight units from milligrams to metric tons, making it perfect for any conversion need whether you're cooking, shipping packages, or working with scientific measurements.
Technically, weight and mass are different concepts. Mass measures the amount of matter in an object and remains constant anywhere in the universe. Weight measures the force of gravity on that mass and varies depending on location. However, in everyday use, we use weight and mass interchangeably. On Earth, a kilogram of mass weighs one kilogram. Our converter works with both metric units (grams, kilograms) and imperial units (ounces, pounds) for practical everyday conversions.
Metric Units: The metric system uses grams (g), kilograms (kg), and metric tons. This decimal system makes conversions simple - 1 kilogram equals 1000 grams, and 1 metric ton equals 1000 kilograms. The metric system is used globally in science, medicine, and most countries for daily measurements.
Imperial Units: The imperial system includes ounces (oz), pounds (lb), and tons. Common in the United States, these units have less intuitive conversions - 1 pound equals 16 ounces, and 1 US ton equals 2000 pounds. Despite its complexity, it's deeply embedded in American commerce, cooking, and daily life.
Home cooks convert recipe measurements when using cookbooks from different countries - European recipes use grams while American recipes use cups and ounces. Fitness enthusiasts track body weight and lifting weights in preferred units. Online shoppers calculate shipping costs by converting package weights between systems. Travelers understand luggage weight limits when flying between countries with different measurement standards. Scientists and students convert measurements for laboratory work and physics problems. Postal workers calculate international shipping rates. Nutrition-conscious individuals read food labels from different countries. Manufacturers convert product specifications for international markets.
These common conversions are useful to remember:
• 1 ounce = 28.35 grams
• 1 pound = 453.6 grams or about 0.45 kilograms
• 1 kilogram = 2.205 pounds
• 1 gram = 0.035 ounces
• 1 metric ton = 1000 kg or about 2205 pounds
• 1 US ton = 2000 pounds or about 907 kilograms
Understanding these conversions helps when shopping internationally, cooking from foreign recipes, or interpreting product specifications.
In cooking, weight measurements are more accurate than volume measurements. Professional bakers prefer weighing ingredients in grams because it's more precise than measuring cups. When converting recipes, remember that different ingredients have different densities - a cup of flour weighs differently than a cup of sugar. Using weight measurements eliminates these inconsistencies and produces more reliable results. This is why European recipes typically use grams while American recipes use cups and tablespoons.
When shipping internationally, understanding weight conversions is crucial. Postal services may use different units - USPS uses pounds while international carriers often use kilograms. Even small weight differences can affect shipping costs and delivery options. Always verify package weight in the correct unit system to avoid unexpected charges. Remember that dimensional weight (based on package size) may also apply for large, lightweight packages.
All weight conversions happen locally in your browser. No data is transmitted to servers, ensuring privacy. The tool uses precise conversion factors and works offline. Results are accurate enough for both everyday use and professional applications requiring precise measurements.