Convert between kg, lbs, grams, ounces, stone, tons and 15+ weight units — instantly.
This free weight converter lets you instantly switch between kilograms (kg), pounds (lbs), grams (g), ounces (oz), stone (st), milligrams (mg), micrograms (μg), metric tons, US short tons, UK long tons, carats (ct), troy ounces, and more — 15 units in total, covering every weight measurement system used around the world. Whether you are tracking your body weight across different countries, scaling a cooking recipe, calculating international shipping costs, converting precious metal weights, or working on a scientific calculation, this tool gives you the exact answer instantly.
Weight conversion is one of the most searched unit conversions on the internet — and for good reason. The world is split between the metric system (used by approximately 95% of the global population) and the imperial system (used primarily in the United States, with the UK using a hybrid of both). Every day, millions of people need to cross that divide: reading a foreign recipe, weighing luggage for an international flight, comparing product weights from overseas suppliers, or simply understanding what their doctor's scale in kilograms means in the pounds they grew up with. This guide covers every conversion you might need, with exact formulas, practical tables, and real-world context.
Metric Units — gram (g), kilogram (kg), milligram (mg), microgram (μg), metric ton (t) — used globally in science, medicine, international trade, and everyday life in most countries. The kilogram is the SI base unit of mass, defined since 2019 by a fixed numerical value of the Planck constant.
Imperial / US Customary Units — ounce (oz), pound (lb), stone (st), US short ton, UK long ton, US hundredweight, UK hundredweight — used primarily in the United States (ounce, pound, ton) and United Kingdom (stone for body weight, pounds for many everyday uses). The UK officially adopted metric in 1965 but retains imperial units culturally, especially for body weight in stone and road distances in miles.
Specialized Units — carat (ct) for gemstones and diamonds, troy ounce (ozt) and troy pound for precious metals like gold, silver, and platinum. These units have their own historical systems distinct from everyday avoirdupois (standard) weights.
The table below is the most commonly needed weight conversion — kilograms to pounds — covering the full range of human body weights and common object weights. All values use the exact conversion factor of 1 kg = 2.20462 lbs.
| Kilograms (kg) | Pounds (lbs) | Lbs & Oz | Stone & Lbs | Grams (g) |
|---|---|---|---|---|
| 1 kg | 2.205 lbs | 2 lb 3.3 oz | 0 st 2.2 lb | 1,000 g |
| 5 kg | 11.023 lbs | 11 lb 0.4 oz | 0 st 11 lb | 5,000 g |
| 10 kg | 22.046 lbs | 22 lb 0.7 oz | 1 st 8 lb | 10,000 g |
| 20 kg | 44.092 lbs | 44 lb 1.5 oz | 3 st 2.1 lb | 20,000 g |
| 30 kg | 66.139 lbs | 66 lb 2.2 oz | 4 st 10.1 lb | 30,000 g |
| 40 kg | 88.185 lbs | 88 lb 3 oz | 6 st 4.2 lb | 40,000 g |
| 50 kg | 110.231 lbs | 110 lb 3.7 oz | 7 st 12.2 lb | 50,000 g |
| 60 kg | 132.277 lbs | 132 lb 4.4 oz | 9 st 6.3 lb | 60,000 g |
| 70 kg | 154.324 lbs | 154 lb 5.2 oz | 11 st 0.3 lb | 70,000 g |
| 75 kg | 165.347 lbs | 165 lb 5.5 oz | 11 st 11.3 lb | 75,000 g |
| 80 kg | 176.370 lbs | 176 lb 5.9 oz | 12 st 8.4 lb | 80,000 g |
| 90 kg | 198.416 lbs | 198 lb 6.7 oz | 14 st 2.4 lb | 90,000 g |
| 100 kg | 220.462 lbs | 220 lb 7.4 oz | 15 st 10.5 lb | 100,000 g |
| 120 kg | 264.555 lbs | 264 lb 8.9 oz | 18 st 12.6 lb | 120,000 g |
| 150 kg | 330.693 lbs | 330 lb 11.1 oz | 23 st 8.7 lb | 150,000 g |
| Convert From | Convert To | Multiply By | Example |
|---|---|---|---|
| Kilograms (kg) | Pounds (lb) | × 2.20462 | 70 kg = 154.32 lbs |
| Pounds (lb) | Kilograms (kg) | × 0.453592 | 150 lb = 68.04 kg |
| Kilograms (kg) | Grams (g) | × 1,000 | 2.5 kg = 2,500 g |
| Grams (g) | Kilograms (kg) | ÷ 1,000 | 750 g = 0.75 kg |
| Grams (g) | Ounces (oz) | × 0.035274 | 500 g = 17.64 oz |
| Ounces (oz) | Grams (g) | × 28.3495 | 8 oz = 226.8 g |
| Pounds (lb) | Ounces (oz) | × 16 | 2.5 lb = 40 oz |
| Ounces (oz) | Pounds (lb) | ÷ 16 | 24 oz = 1.5 lb |
| Kilograms (kg) | Stone (st) | × 0.157473 | 80 kg = 12.6 st |
| Stone (st) | Kilograms (kg) | × 6.35029 | 11 st = 69.85 kg |
| Stone (st) | Pounds (lb) | × 14 | 10 st = 140 lb |
| Kilograms (kg) | Metric Ton (t) | ÷ 1,000 | 5,000 kg = 5 t |
| Grams (g) | Milligrams (mg) | × 1,000 | 0.5 g = 500 mg |
| Grams (g) | Carats (ct) | × 5 | 1 g = 5 ct |
| Troy Ounce (ozt) | Grams (g) | × 31.1035 | 10 ozt = 311.0 g |
Fitness & Health: Body weight is measured in kilograms in most countries, pounds in the United States, and stone + pounds in the UK and Ireland. A person weighing 75 kg is 165.3 lbs or 11 stone 11 lbs. Gym equipment — barbells, dumbbells, kettlebells — is labeled in both kg and lbs in most commercial gyms, but competition powerlifting and Olympic weightlifting use kilograms exclusively. Knowing your weight in the right unit is essential when reading international BMI charts, calculating macro ratios, or following a training program written in a different country's conventions.
Cooking & Baking: Weight is more accurate than volume for cooking, particularly baking. A cup of flour can vary by 30% in weight depending on how tightly it is packed; 120 grams of flour is always 120 grams. US recipes typically use ounces and pounds; European and Asian recipes use grams. Converting between them requires the exact factor: 1 oz = 28.3495 g, not the rounded 28 g sometimes used informally (the 1.2% rounding error can compound in large batches and affect results in precision baking like croissants, macarons, and sourdough where hydration ratios are critical).
Shipping & Logistics: International shipping uses kilograms for dimensional weight calculations, but courier services in the US quote in pounds. Air freight is typically priced per kilogram. Many carriers use "volumetric weight" (also called dimensional weight) — whichever is greater between actual weight and a calculated volume-based weight. Understanding the conversion prevents billing surprises when sending parcels across metric/imperial borders.
Science & Medicine: All scientific and medical contexts use metric units. Drug dosages are calculated in milligrams per kilogram of body weight (mg/kg). Laboratory balances measure in grams and milligrams. Nutritional information on food packaging is required by law in most countries to be in metric units. Converting between grams and ounces — or between milligrams and micrograms — is a daily task in pharmaceutical and clinical settings.
Precious Metals & Gemstones: Gold, silver, platinum, and palladium prices are quoted in troy ounces, not the standard avoirdupois ounces used for everything else. This distinction matters: a troy ounce is 31.1035 grams, while a standard ounce is 28.3495 grams — a difference of nearly 10%. Buying or selling gold based on the wrong ounce definition would create a significant pricing error. Diamonds and colored gemstones are weighed in carats, where 1 carat = 0.2 grams exactly.
Automotive & Engineering: Vehicle curb weight and payload specifications switch between metric tons, kilograms, and US short tons depending on the manufacturer's country of origin and the market being served. European vehicles list weight in kg; US-market specs often use lbs. Towing capacity may be listed in either system. Structural load calculations in civil engineering use metric tons for forces and kilonewtons for loads.
The table below covers the typical range of adult human body weights, expressed in all three major systems used globally. The WHO uses kilograms; the US uses pounds; the UK conventionally uses stone and pounds for personal body weight.
| kg | lbs | Stone & lbs | General Context |
|---|---|---|---|
| 45 kg | 99.2 lbs | 7 st 1 lb | Lightweight adult / underweight threshold |
| 50 kg | 110.2 lbs | 7 st 12 lb | Small frame adult |
| 55 kg | 121.3 lbs | 8 st 9 lb | Average small adult |
| 60 kg | 132.3 lbs | 9 st 6 lb | Average adult (shorter stature) |
| 65 kg | 143.3 lbs | 10 st 3 lb | Average adult (medium stature) |
| 70 kg | 154.3 lbs | 11 st 0 lb | Average adult male (global) |
| 75 kg | 165.3 lbs | 11 st 11 lb | Common gym training weight goal |
| 80 kg | 176.4 lbs | 12 st 8 lb | Above average adult male |
| 90 kg | 198.4 lbs | 14 st 2 lb | Heavy adult / athlete (rugby, football) |
| 100 kg | 220.5 lbs | 15 st 10 lb | Heavyweight threshold |
| 120 kg | 264.6 lbs | 18 st 13 lb | Seriously overweight / obese range |
| 150 kg | 330.7 lbs | 23 st 9 lb | Extreme obesity / bariatric range |
Baking requires precise weight measurements because even small deviations — particularly in flour, sugar, and leavening agents — can significantly affect the outcome. Volume measurements (cups, tablespoons) introduce variation because ingredient density changes with humidity, packing, and settling. Professional bakers use a digital scale and work in grams. The conversions below cover the most common ingredients measured in both ounces and grams.
| Ingredient | 1 Cup (approx. grams) | 1 oz in grams | 4 oz (¼ lb) | 8 oz (½ lb) | 16 oz (1 lb) |
|---|---|---|---|---|---|
| All-purpose flour | 120–130 g | 28.3 g | 113 g | 227 g | 454 g |
| Bread flour | 120–130 g | 28.3 g | 113 g | 227 g | 454 g |
| Granulated sugar | 200 g | 28.3 g | 113 g | 227 g | 454 g |
| Brown sugar (packed) | 220 g | 28.3 g | 113 g | 227 g | 454 g |
| Powdered sugar | 120 g | 28.3 g | 113 g | 227 g | 454 g |
| Butter | 227 g | 28.3 g | 113 g | 227 g | 454 g |
| Cocoa powder | 85 g | 28.3 g | 113 g | 227 g | 454 g |
| Salt (fine) | 288 g | 28.3 g | 113 g | 227 g | 454 g |
| Rolled oats | 90 g | 28.3 g | 113 g | 227 g | 454 g |
| Honey / Maple syrup | 340 g | 28.3 g | 113 g | 227 g | 454 g |
Tracking your body weight consistently in one unit system is essential for meaningful progress monitoring. Switching between systems mid-program introduces confusion — a 0.5 kg loss (1.1 lbs) looks dramatically different at each scale and can give a false impression of plateau or progress depending on which unit you are viewing.
Most international fitness apps (MyFitnessPal, Strava, Garmin Connect, Apple Health) support both kg and lbs and can be configured to your preference. When following a training program written for a different market, you will regularly need to convert weights: a program calling for "225 lb squat" needs to know that 225 lbs = 102.06 kg (which gym-goers often round to 100 kg — a significant 2 kg or 4.4 lb difference that matters at competition level).
Olympic weightlifting competitions use standard barbell weights in kilograms: the bar itself is 20 kg (44 lbs), with plates commonly available in 25 kg, 20 kg, 15 kg, 10 kg, 5 kg, 2.5 kg, 2 kg, 1.5 kg, 1 kg, and 0.5 kg. Converting any of these to pounds requires the exact 2.20462 factor — rounding to 2.2 for a 25 kg plate gives 55 lbs when the true value is 55.12 lbs.
The metric system (gram, kilogram, tonne) is the international standard for science, medicine, trade, and everyday life in approximately 95% of the world. Its fundamental advantage is decimal organization — every unit is a multiple of 10 of the next, making calculations and unit conversions straightforward. 1,000 milligrams = 1 gram. 1,000 grams = 1 kilogram. 1,000 kilograms = 1 metric ton. No memorization of arbitrary conversion factors required within the system.
The imperial and US customary systems use historically inherited relationships: 16 ounces in a pound, 14 pounds in a stone, 2,000 pounds in a US short ton, 2,240 pounds in a UK long ton. These numbers reflect old trade conventions rather than mathematical logic. The US is the only major industrialized nation that has not formally adopted metric for everyday use, though metric is mandated in science, medicine, military, and pharmaceutical contexts even in the US.
The stone is a uniquely British and Irish unit with no American equivalent. Used almost exclusively for body weight, it persists because generations of British people were weighed in stone at their GP and never switched. A British person saying they weigh "12 stone 4" means 12 × 14 + 4 = 172 lbs = 78.02 kg. The unit sees essentially zero use in professional contexts — medical charts, research papers, and nutrition labels all use kilograms even in the UK.
The troy weight system is completely separate from both the metric and avoirdupois (standard) imperial systems. It originated in Troyes, France, a major medieval trading city, and has been used for precious metals and gemstones for centuries. Understanding the difference between a troy ounce and a standard ounce is essential for anyone buying or selling gold, silver, or platinum.
Key troy conversions: 1 troy pound = 12 troy ounces (not 16, like the avoirdupois pound). 1 troy ounce = 31.1035 grams (vs. 28.3495 grams for a standard ounce). 1 troy pound = 373.242 grams. When you see a gold price quoted as "$X per ounce," that is always a troy ounce. Buying 1 "ounce" of gold expecting the standard 28.35 grams would mean paying for 31.10 grams — a roughly 10% quantity error in your favor, or the reverse if selling.
Multiply your kilogram value by 2.20462 to get pounds. Example: 75 kg × 2.20462 = 165.35 lbs. For quick mental math, multiply by 2.2 and add 0.46% of that result: 75 × 2.2 = 165, then 165 × 0.0046 = 0.76, giving 165.76 (close — the exact is 165.35). To go the other direction, divide pounds by 2.20462, or multiply by 0.453592.
1 kilogram equals exactly 2.20462262185 pounds. For practical use, 2.205 lbs is accurate to four decimal places. For everyday estimation, 1 kg ≈ 2.2 lbs is close enough for most purposes. The exact relationship is defined the other way: 1 pound = 0.45359237 kg exactly (an internationally agreed definition since 1959), making 1 kg = 1 ÷ 0.45359237 = 2.20462 lbs.
1 stone = 14 pounds = 6.35029 kg. This unit is used almost exclusively in the UK and Ireland for measuring body weight and has no equivalent in either the US or metric systems. To convert your weight from kg to stone: divide by 6.35029 to get the total in stone (including decimal), then multiply the decimal part by 14 to get the remaining pounds. Example: 82 kg ÷ 6.35029 = 12.913 stone = 12 stone and 0.913 × 14 = 12.8 lbs, so 12 stone 13 lbs.
1 avoirdupois ounce = 28.3495 grams. This is the standard ounce for food, body weight, and general commerce. Note that the troy ounce (used for gold, silver, and other precious metals) is heavier: 1 troy oz = 31.1035 grams. Always check which ounce system applies — the difference of nearly 10% is significant in financial or pharmaceutical contexts.
A metric ton (tonne) = 1,000 kg = 2,204.62 lbs. A US short ton = 2,000 lbs = 907.185 kg. A UK long ton = 2,240 lbs = 1,016.05 kg. The metric ton is approximately 10% heavier than the US short ton. In international trade and shipping, "ton" almost always means metric ton. In the US domestic market, "ton" usually means short ton. UK usage has largely transitioned to metric tons for commerce. Always specify which ton you mean in contracts, invoices, and shipping documents to avoid costly errors.
There are exactly 16 ounces (avoirdupois) in 1 pound — this is a fixed, exact definition. So: 1 lb = 16 oz = 453.592 g. Common cooking conversions: ¼ lb = 4 oz = 113.4 g; ½ lb = 8 oz = 226.8 g; ¾ lb = 12 oz = 340.2 g; 1 lb = 16 oz = 453.6 g. Note: the troy pound used for precious metals contains only 12 troy ounces, not 16 — another reason to confirm the system in use.
Multiply your pound value by the exact factor 0.45359237 (the internationally defined value). For most practical purposes, 0.453592 is more than sufficient. The common approximation of "divide by 2.2" gives a result about 0.2% higher than the true value — which is fine for body weight but accumulates meaningfully in large-scale commercial or scientific applications. Example: 200 lbs × 0.453592 = 90.718 kg (exact method); 200 ÷ 2.2 = 90.909 kg (approximation — off by 0.19 kg or 0.42 lbs).