Convert between weight and mass units instantly. Accurate conversions between kilograms, grams, pounds, ounces, stones, and more.
Our weight and mass converter makes it easy to convert between different units of weight and mass. Whether you're cooking, tracking fitness progress, shipping packages, or working on scientific calculations, this tool provides instant, accurate conversions.
Weight and mass are fundamental measurements used in everyday life, science, and commerce. While often used interchangeably in casual conversation, they have distinct scientific meanings. Understanding these units helps in cooking, fitness tracking, shipping, and international trade.
The metric system uses grams and kilograms as base units, with powers of 10 for conversions (1 kg = 1000 g). The imperial system uses pounds and ounces, with less intuitive conversions (1 lb = 16 oz). The metric system is used globally in science and most countries, while the imperial system is common in the United States and some other countries.
For more detailed information about weight and mass measurements, you can refer to the Wikipedia article on weight and mass.
💡 Cooking Precision: For baking, use weight measurements instead of volume for better accuracy. 1 cup of flour can vary from 120-150g depending on how it's packed, while 120g is always 120g.
💡 Fitness Tracking: When tracking body weight, use the same unit consistently and weigh yourself at the same time of day for accurate comparisons. Small daily fluctuations are normal.
💡 International Shipping: Always confirm whether shipping rates are based on actual weight or dimensional weight. Dimensional weight uses package volume and can be higher than actual weight for large, light items.
💡 Precious Metals: Precious metals use troy ounces (31.1035g) rather than standard ounces (28.3495g). This difference matters when buying gold, silver, or platinum.
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Mass is the amount of matter in an object and remains constant regardless of location. Weight is the force exerted on mass by gravity and varies with gravitational field strength. On Earth, 1 kg mass weighs about 9.8 Newtons, but on the Moon, the same mass would weigh only about 1.6 Newtons.
1 kilogram equals 2.20462 pounds. To convert kg to lb, multiply by 2.20462. To convert pounds to kilograms, divide by 2.20462. For quick mental calculations, 1 kg ≈ 2.2 lb is often sufficient. Our converter handles these calculations automatically with high precision.
Common cooking conversions: 1 cup all-purpose flour ≈ 120g, 1 cup granulated sugar ≈ 200g, 1 cup butter ≈ 227g, 1 tablespoon ≈ 14.3g, 1 teaspoon ≈ 4.9g. These can vary slightly based on ingredient density and how ingredients are packed. Using weight measurements in cooking provides better consistency than volume measurements.
There are 28.3495 grams in one ounce. For cooking, this is often rounded to 28g. For precious metals, a troy ounce is used, which equals 31.1035 grams. The difference between standard and troy ounces is important when dealing with gold, silver, and other precious metals.
A stone is a British unit of weight equal to 14 pounds or approximately 6.35 kilograms. It's primarily used in the UK and Ireland for measuring body weight. 1 stone = 14 lb = 6.35029 kg. While uncommon in other countries, it's still widely used in British healthcare and fitness contexts.