Under the international 1959 yard and pound agreement adopted by NIST and ISO, 1 avoirdupois pound (lb) is defined as exactly 0.45359237 kilograms (kg), meaning 1 kg ≈ 2.20462262 lbs. To convert kg to pounds and ounces, multiply kilograms by 2.20462262 to find total pounds, take the whole integer as pounds, and multiply the remaining decimal fraction by 16 to get ounces. For example, 3.5 kg equals 7.71618 lbs, which breaks down to exactly 7 lbs and 11.46 oz. Our Weight & Mass Converter computes exact compound breakdowns into pounds, ounces, and British stone automatically in real time with 64-bit precision.

A standard avoirdupois ounce (oz) equals 28.349523125 grams (437.5 grains, with 16 ounces per avoirdupois pound). In contrast, a troy ounce (oz t) equals 31.1034768 grams (480 grains, with 12 troy ounces per troy pound). Troy weight is the legally mandated worldwide standard for pricing precious metals including gold, silver, and platinum bullion.

1 British stone (st) equals exactly 14 avoirdupois pounds (approx. 6.35029318 kg). In the UK and Ireland, human body weight is customarily expressed in compound stones and pounds (e.g. 11 stone 4 pounds = 158 lbs = 71.67 kg). Our Body Weight tab handles these 2-way compound conversions automatically alongside healthy BMI range indicators.

Mass (m) is the fundamental quantitative measure of inertia and amount of matter in an object, measured in kilograms (kg) and invariant across the universe. Weight (W = m · g) is the gravitational force exerted on that mass by a planetary body, measured in Newtons (N) or pounds-force (lbf). On the Moon (g = 1.62 m/s²), your mass remains identical, but your weight is only 16.5% of what it is on Earth.

Because volume depends heavily on ingredient packing density and aeration, 1 cup of all-purpose flour weighs approximately 120g, whereas 1 cup of granulated sugar weighs 200g, brown sugar packed weighs 220g, butter weighs 227g, and honey weighs 340g. Use our Kitchen & Culinary Density tab to choose your exact baking ingredient for precision measurements.

A metric carat (ct) is officially defined as exactly 200 milligrams (0.2 grams or 0.0002 kg) and is the global legal standard for measuring diamonds and gemstones. A traditional South Asian tola equals exactly 180 grains or 11.6638038 grams (0.0116638 kg), widely used for gold and silver bullion. In nuclear physics, the unified atomic mass unit or Dalton (Da / u) is defined as 1/12 the mass of an unbound carbon-12 atom at rest, equal to approximately 1.66053906660 × 10⁻²⁷ kg.

A US Short Ton (sh tn) equals 2,000 avoirdupois pounds (~907.185 kg). An Imperial Long Ton (long tn, British ton) equals 2,240 avoirdupois pounds (~1,016.047 kg, exactly 160 stone). A Metric Ton (tonne, t) equals exactly 1,000 kilograms (~2,204.62 lbs or ~1.1023 US short tons). Our converter clearly distinguishes these three tons across all calculation matrices.

Yes. In the Batch Convert tab, you can enter or paste hundreds of weight measurements at once, or load categorized presets (Gym Plates, Baking Ingredients, Bullion Coins, Air Cargo). Results can be downloaded as CSV spreadsheets, structured JSON audit files, or formatted Markdown tables with customizable export filenames and optional date stamps.

Click the '💻 API Code' button (or press Alt+S) to open the Developer API Code Snippets Studio. We provide verified, production-ready code implementations in TypeScript, Python 3, Go, Rust, Java, and Bash that utilize base SI conversion factors for high-precision math.

Yes, 100%. All arithmetic transformations, unit matrices, culinary density computations, and batch file parsers execute entirely client-side using JavaScript. No weight values, personal medical figures, or commercial shipment datasets are ever transmitted to external servers or logged in remote databases.