Free online weight converter.
Weight converter calculator for kg to lbs, stones to pounds, lbs to kg, and 25+ units. Accurate, private, and runs entirely in your browser.
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Browse all unitsExact, not rounded
NIST-grade conversion factors.
Every factor comes from official standards - not approximations. One pound is exactly 0.45359237 kg. One troy ounce is exactly 31.1034768 g. Your results stay precise until you choose how to display them.
// NIST / ISO / CODATA definitions
1 lb = 453.59237 g
1 oz = 28.349523125 g
1 oz t = 31.1034768 g
1 st = 6350.29318 g
1 t = 1_000_000 g
1 u = 1.6605390666e-24 g
result = value × (fromGrams / toGrams)Understanding weight units.
Weight and mass measurements vary by region and industry. The metric system - built around the kilogram - is the international standard used in science, medicine, and most countries worldwide. The imperial system, featuring pounds and ounces, remains common in the United States for everyday measurements.
Metric units
The kilogram (kg) is the SI base unit of mass. Smaller quantities use grams (g), milligrams (mg), and micrograms (μg). Larger quantities use metric tons (t) and quintals (100 kg), common in agriculture across Europe, India, and Latin America.
Imperial and US customary units
Pounds (lb) and ounces (oz) form the backbone of US customary weight. One pound equals 16 ounces, and one stone equals 14 pounds - still used for body weight in the UK and Ireland. Hundredweights and quarters remain in British and American wholesale trade.
Troy and specialty units
Troy ounces price gold and silver worldwide. Carats measure gemstones. Grains appear in ballistics and medicine. Each has a precise definition - and a dedicated conversion page on this site.
When to use each unit
- Kilograms and pounds - body weight, gym equipment, luggage limits
- Grams and ounces - cooking, nutrition labels, small packages
- Stones - personal body weight in the UK
- Troy ounces - precious metals and bullion pricing
- Metric tons and quintals - shipping, agriculture, industrial materials
- Milligrams and micrograms - pharmaceuticals, lab measurements
About this weight converter
Your free weight converter for everyday and professional use
This free weight converter helps you switch between kilograms, pounds, ounces, grams, stones, troy ounces, metric tons, and many other units in seconds. Whether you arrived from a Google weight converter search, need a weight converter calculator for a recipe or customs form, or want a dependable mass to weight converter for gym plates and airline baggage limits, the tool above gives instant answers with no account required. Every calculation runs locally in your browser, so your values stay private and the page keeps working after it loads. Use the interactive converter, open dedicated routes such as weight converter kg to lbs or weight converter lbs to kg, or type natural language like "150 lbs to kg" in the quick-search box.
Weight converter kg to lbs, kg to pounds, and reverse conversions
Metric and imperial units collide daily in travel, trade, and sport. Our weight converter from kg to lbs applies the exact international definition-one avoirdupois pound equals 0.45359237 kilograms-so 70 kg becomes 154.323584 lb with full precision until you choose how to display the result. The weight converter kg to pounds workflow is the same in the main calculator and on standalone conversion pages with formulas and examples. For the opposite direction, weight converter lbs to kg multiplies by that same factor: 150 lb equals 68.0388555 kg. These pairs rank among the most common searches worldwide, and each direction has its own reference page, FAQ block, and shareable URL.
Weight converter calculator: stones to pounds and UK body weight
Readers in the United Kingdom and Ireland often need a weight converter from stone to pounds or a weight converter calculator stones to pounds for medical records, fitness apps, and luggage rules. One stone equals exactly fourteen pounds (6.35029318 kg). This weight converter from stone to pounds converts in both directions and links to stone-to-kilogram pages when you need metric output. Unlike rough mental math, the weight converter calculator here uses the same NIST-grade factors as every other unit on the site. Select stone (st) in the converter, enter your value, and copy the auto-updating address bar to share an exact conversion with your coach, clinic, or travel companion.
Weight converter chart, table, and quick reference
Sometimes you need a weight converter chart or weight converter table instead of a single figure. Popular conversion pages include reference tables listing five, ten, or more example values-from spice quantities in grams to athlete body mass in pounds-so you can scan equivalents without retyping each amount. The units index groups every supported symbol with links to unit hubs and related pairs. Together these pages act like a printable weight converter table for classrooms, commercial kitchens, warehouses, and jewelry benches where grams and troy ounces appear side by side. Bookmark the pairs you use most and return whenever labels switch systems mid-project.
Mass to weight converter: precision you can trust
In physics, mass and weight are not identical: mass measures the amount of matter in kilograms, while weight is the gravitational force on that mass, measured in newtons. Everyday English treats them as synonyms, and this mass to weight converter follows that practical convention. Factors come from NIST, ISO, and CODATA definitions, covering troy ounces for bullion, grains for ballistics, carats for gemstones, and atomic mass units for chemistry homework. Results are computed in JavaScript with double-precision floating point and no server round-trip, matching or exceeding a typical Google weight converter answer while supporting far more symbols and specialist units.
Volumetric weight, dimensional weight, and shipping searches
Searches for volumetric weight converter or FedEx dimensional weight converter usually refer to carrier billing weight derived from package dimensions-length × width × height divided by a carrier-specific factor-not mass unit conversion. FedEx, UPS, and DHL compare actual scale weight with dimensional weight and bill whichever is higher. This site is a mass and weight unit converter: kilograms to pounds, ounces to grams, stones to kilograms. It does not compute cubic size divisors. If you already know actual mass in kilograms and need pounds for a commercial invoice, use our weight converter from kg to lbs. For volumetric rules, check your carrier's current dimensional factor, then convert the chargeable kilograms or pounds here.
Frequently asked questions
How do you convert 1 kg to lbs?
Multiply kilograms by 2.2046226218 (or divide by 0.45359237). One kilogram equals exactly 2.2046226218 avoirdupois pounds, so 1 kg = 2.205 lb when rounded to three decimal places. Use the converter above and enter 1 in the kilogram field to see the exact pound value.
What kg is in stones and pounds?
To express kilograms as stones and pounds, convert to pounds first (kg × 2.2046226218), then divide by 14 for whole stones-the remainder is pounds. Alternatively, divide kg by 6.35029318 for the stone total (one stone = 14 lb = 6.35029318 kg). For example, 70 kg = 11 st 0.3 lb (or 154.32 lb).
How to calculate weight in kg?
Multiply your value by the factor that converts your unit to kilograms. From pounds: multiply by 0.45359237. From stones: multiply by 6.35029318. From grams: divide by 1,000. From ounces: multiply by 0.028349523125. Enter your amount in the converter above and select kilograms as the output unit.
Is 11 stone 70 kg?
Almost, but not exactly. Eleven stone equals 69.85322498 kg (11 × 6.35029318). That is about 0.15 kg less than 70 kg, or roughly 154 lb versus 70 kg’s 154.32 lb. For clinical or shipping purposes, use the exact conversion rather than rounding.
What is 1kg in a stone?
One kilogram equals 0.157473044 stone (1 ÷ 6.35029318). In pounds that is 2.205 lb-well under one stone, since one stone is 14 lb (6.35 kg). UK body-weight scales often show stones with a separate pounds remainder.
What is 2 kg in stones?
Two kilograms equal 0.314946088 stone (2 ÷ 6.35029318), or about 4.409 lb. That is zero whole stones and roughly 4 lb 6 oz. Select stone (st) in the converter and enter 2 kg to see stones and pounds together.
How heavy am I in kg?
Convert your current reading to kilograms using the appropriate factor. If your scale shows pounds, multiply by 0.45359237. If it shows stones, multiply by 6.35029318 (or convert stone to pounds first, then to kg). Enter your weight in the converter above with your unit selected and choose kg as the result.
Is 1 kg equal to 2 lbs?
No. One kilogram equals 2.2046226218 pounds-about 10% heavier than 2 lb. Conversely, 2 lb equals only 0.90718474 kg. The rough “1 kg ≈ 2 lb” rule is a mental shortcut, not an exact equivalence.
Is 500g the same as 1 lb?
No. One avoirdupois pound equals 453.59237 grams, so 500 g is about 46.4 g heavier than 1 lb (500 g = 1.10231 lb). For cooking or shipping, 500 g and 1 lb are not interchangeable without converting.
How do I convert my weight to kg?
From pounds: multiply by 0.45359237 (e.g. 150 lb × 0.45359237 = 68.04 kg). From stones: multiply by 6.35029318. From grams: divide by 1,000. Type your value in the quick-search box (e.g. “11 stone in kg”) or use the main converter with kg as the target unit.
What is 500g in kg?
500 grams equals 0.5 kilograms. The prefix “kilo-” means one thousand, so 1 kg = 1,000 g and 500 g = 500 ÷ 1,000 = 0.5 kg.
How many grams is 1 kg?
One kilogram contains exactly 1,000 grams. “Kilo” means thousand in the metric system, so 1 kg = 1,000 g, 0.5 kg = 500 g, and 2.5 kg = 2,500 g.
Is 1 kilo 1 kg?
Yes. “Kilo” is informal shorthand for kilogram in everyday speech. One kilo and one kg mean the same thing: 1,000 grams. In science and trade the full symbol kg is preferred.
How do I convert kg to lbs?
Multiply kilograms by 2.2046226218. For example, 70 kg × 2.2046226218 = 154.323584 lb. You can also divide by 0.45359237 (since 1 lb = 0.45359237 kg). Use the converter above or open the dedicated kg-to-lb page for a shareable link.
How much is 1.5 kg in weight?
1.5 kg equals 1,500 grams, 3.306934 lb, or 0.236209 stone. That is roughly 3 lb 5 oz-common for newborn babies, hand luggage limits, or small packages on kitchen scales.
What is 1 pound in 1kg?
One avoirdupois pound equals 0.45359237 kilograms-the internationally defined exact value since 1959. So 1 lb = 0.454 kg when rounded to three decimals, and 1 kg = 2.205 lb in the opposite direction.
How heavy is 2 kg?
Two kilograms equals 2,000 grams, 4.409245 pounds, or 0.315 stone. That is about the weight of a large pineapple, a standard laptop, or a bag of sugar-roughly 4 lb 6 oz on an imperial scale.
What is the difference between weight and mass?
In everyday language, "weight" and "mass" are often used interchangeably. Scientifically, mass measures the amount of matter in an object (kilograms), while weight is the force gravity exerts on that mass (newtons). This converter uses mass units as commonly understood in daily use.
How accurate is this weight converter?
This converter uses exact conversion factors from NIST and ISO standards, such as 1 lb = 0.45359237 kg and 1 oz = 28.349523125 g. Results are computed entirely in your browser with no rounding until display.
What is the difference between a US ton and a metric ton?
A US short ton equals 2,000 pounds (907.18474 kg). A metric ton (tonne) equals 1,000 kilograms. An imperial long ton equals 2,240 pounds (1,016.0469088 kg).
How do I convert pounds to kilograms?
Multiply pounds by 0.45359237. For example, 150 lb × 0.45359237 = 68.04 kg.
What units does this converter support?
Micrograms, milligrams, grams, kilograms, metric tons, quintals, ounces, pounds, stones, drams, UK quarters, US and UK hundredweights, US and imperial tons, pennyweights, troy ounces, troy pounds, carats, grains, and atomic mass units.
Can I share a conversion with someone?
Yes. The URL updates automatically with your value and selected units. Copy the address bar to share an exact conversion.
Does this converter work offline?
Once the page loads, all calculations run locally in your browser. No data is sent to any server.
What is a stone in weight measurement?
A stone equals 14 pounds (6.35029318 kg). It is commonly used for body weight in the UK and Ireland.