Weight Converter
The Weight Converter instantly converts between metric and imperial weight units, including milligrams, grams, kilograms, metric tons, ounces, pounds, and stone. It's frequently used for tracking body weight across US and UK/European sources that report in pounds versus kilograms or stone, as well as for cooking and shipping, where package weights and postage rates are often listed in the unit your country doesn't normally use. As with the Length Converter, all conversions use fixed international definitions, so the only imprecision comes from rounding the displayed result.
How This Tool Works
Enter a value and choose your source and target weight units for an instant conversion.
Formula & Method
All units convert through grams as a common base, e.g., 1 pound = 453.592 grams, 1 kilogram = 1,000 grams.
Example Calculation
150 pounds converts to about 68 kilograms, or 10.7 stone. A 185-pound person converts to about 83.9 kilograms, 13.2 stone, or 2,960 ounces — the kilogram figure is the one most gym equipment and medical charts outside the US use. A 1-pound bag of flour is about 453.6 grams, close to the 500-gram bags common in metric countries.
About the Weight Converter
Weights show up in different units depending on who wrote them. A doctor's office in the US records pounds, a gym in Europe loads kilograms, a British scale might report stone, a recipe from Australia lists grams, and a freight quote talks in tons. This converter moves a number between eight units, milligrams, grams, kilograms, metric tons, ounces, pounds, stone and US (short) tons, so a figure from one source can be read in whichever unit the rest of your paperwork or equipment uses.
All conversions go through grams. The converter treats a pound as 453.592 grams, an ounce as one sixteenth of that, a stone as fourteen pounds and a US ton as two thousand pounds, while the metric units are plain powers of ten. That pound figure is a rounded form of the true definition of 453.59237 grams, so answers can differ from a fully exact calculation in roughly the seventh significant digit. For body weight, cooking, parcels and shopping, that difference is far below anything a scale could display.
The page is meant for everyday decisions: checking a bag against an airline limit, following a recipe, comparing cargo or product weights, converting a baby's birth weight, or sharing a fitness number with a friend in another country. It reports mass in the ordinary sense, so it does not need to know about gravity. It also does not cover specialized units such as troy ounces, carats or the UK long ton, so those need a different tool.
When to Use It
Checking a luggage allowance
A traveler booking a flight sees a 23 kilogram checked-bag limit while her luggage scale at home reads in pounds. She converts the limit to pounds, finds it is a little over 50, and repacks heavy items into a carry-on so she avoids an overweight fee at the counter.
Reading a recipe from another country
A home baker finds a bread recipe that calls for 500 grams of flour and 8 ounces of butter on different lines of the same page. Converting ounces to grams lets her weigh everything on a metric kitchen scale, which is more consistent than scooping with cups.
Sharing a body weight figure
Someone in England who tracks weight in stone wants to compare notes with a coach in the United States who uses pounds and kilograms. A quick conversion in each direction removes the confusion and keeps a progress chart consistent over time.
Comparing freight and materials
A small contractor receives a quote that lists a delivery of 25 metric tons of gravel, while the local truck regulations are written in US tons. Converting between the two shows whether the load is under the legal limit and avoids a costly mismatch.
How to Use It, Step by Step
- Find the number you want to convert and write down which unit it is in. Look at the label on the scale, the package, the spec sheet or the form, because a missing unit is the most common source of error.
- Type the number into the Value field. It accepts values from zero up to one billion and decimals, so you can enter 0.25 or 187.5 directly.
- Choose the starting unit in the From list. The options are Milligrams, Grams, Kilograms, Metric tons, Ounces, Pounds, Stone and US tons (short), and the page opens with Pounds already selected.
- Choose the unit you want in the To list. It opens on Kilograms; change it to Stone, Ounces or any other unit if that is what you need.
- Press the Convert Weight button. The summary line restates your number and the converted value, and the highlighted In box shows the answer with the target unit's name.
- If your weight is written in two parts, such as 7 pounds 8 ounces, combine them into one unit first. Here 8 ounces is half a pound, so you would type 7.5 pounds.
- Round the answer to something sensible for your purpose: the nearest tenth of a pound or kilogram for body weight, a whole gram for kitchen work, or two decimals for shipping charges.
- To express a result in stone and pounds, convert to stone, keep the whole number, then convert the remaining fraction back to pounds, or divide the total pounds by 14.
Understanding Your Results
The answer appears in the In box and in a summary line, with commas added for large numbers and up to six decimal places kept. A kilogram figure close to half your pound input is the right order of magnitude, since a pound is a little under half a kilogram, and a gram figure should be about 28 times the number of ounces. When a result looks off by a factor of 10 or 1,000, the usual cause is mixing up grams, kilograms and metric tons.
Check results with simple ratios. One kilogram is about 2.2 pounds, one pound is 16 ounces or 453.6 grams, one stone is 14 pounds or about 6.35 kilograms, and a metric ton is about 2,205 pounds, or roughly 10 percent more than a US ton. Multiplying your input by the right ratio in your head should land within a percent or so of the tool's answer.
Decide how precisely to state the result. A body-weight figure of 79.3786 kilograms should be written as 79.4 kg, since scales rarely resolve better than 0.1. For baking, round to the nearest gram; for parcel postage, round up to the next billing increment, because carriers charge on the next whole unit.
More Worked Examples
A body weight of 12.5 stone
Scenario: Value 12.5, From Stone, To Kilograms, then To Pounds.
A stone is 14 pounds, so 12.5 stone is 175 pounds, and the tool confirms this when the target is Pounds. With Kilograms as the target, it multiplies 175 by 0.453592 and returns 79.3786 kilograms. Written for a medical form, that is 79.4 kg. As a mixed value the same weight is 12 stone 7 pounds, because half a stone is 7 pounds. The pounds result is the best figure to compare with US-based charts.
Eight ounces of butter in grams
Scenario: Value 8, From Ounces, To Grams.
An ounce here is one sixteenth of a pound, 28.3495 grams, so 8 ounces is half a pound. The tool returns 226.796 grams. In the kitchen that rounds to 227 grams, which matches the weight of two US sticks of butter. This is a weight ounce, not a fluid ounce, so the figure applies to anything weighed on a scale and does not depend on whether the ingredient is a liquid or a solid.
A 23 kilogram suitcase in pounds
Scenario: Value 23, From Kilograms, To Pounds.
Multiplying 23 kilograms by about 2.2046 pounds per kilogram gives roughly 50.7 pounds, and the tool returns 50.706362 pounds. That is just over 50, so a bag that scales exactly at 50 pounds on a home scale is a little under the 23 kilogram limit, while 51 pounds would be over. Because airline scales have their own tolerance, leaving at least half a kilogram of margin is wise.
Tips for Better Results
- Remember the quick rule that a kilogram is a bit over two pounds. To estimate pounds, double the kilograms and add about 10 percent; to estimate kilograms, halve the pounds and subtract about 10 percent.
- For cooking, use the gram result and a kitchen scale. Weight is much more consistent than volume, because a cup of flour can vary noticeably depending on how it is scooped and packed.
- When tracking body weight over time, pick one unit for the chart and convert every entry into it with this tool. Mixing pounds, kilograms and stone in one log is the easiest way to create fake swings.
- Keep milligrams for small doses and grams for everyday quantities. A result of 0.001 kilograms is easier to read as one gram, so switch the To list to a smaller unit when the number begins with several zeros.
- For shipping, note whether the carrier uses the actual weight or a dimensional weight. This tool only converts the actual weight, so use the carrier's own calculator for what you will really pay.
- When you see the word ton, ask which one. A US short ton is 2,000 pounds, a metric ton is 1,000 kilograms, and a UK long ton is 2,240 pounds, which the tool does not include.
Common Mistakes to Avoid
- Using a fluid ounce figure as a weight. Fluid ounces measure volume, so a bottle labeled 16 fl oz is not necessarily 16 ounces of weight; use the volume converter for liquids unless the label gives net weight.
- Mixing up metric tons and US tons. A metric ton is about 10 percent heavier, so a load quoted in metric tons will exceed a limit written in US tons earlier than you expect.
- Typing pounds and ounces as one decimal. 7.8 pounds is not 7 pounds 8 ounces, because 8 ounces is 0.5 pound, so enter 7.5 instead.
- Using this tool for gold, silver or gemstones. Those are priced in troy ounces and carats, which differ from the ounce in this converter, so a conversion here will be wrong for precious metals.
- Rounding too early. If you convert several items and add them, keep the extra decimals until the final total, because rounding each one to a whole number can shift the sum noticeably.
Assumptions and Limits
- The tool uses 453.592 grams per pound. The exact definition is 453.59237 grams, so results can differ from a perfectly exact conversion by less than one part in a million, which is invisible at any practical precision.
- Ounces are avoirdupois ounces, 1/16 of a pound, and tons are the US short ton of 2,000 pounds and the metric ton of 1,000 kilograms. Troy ounces, carats, UK long tons and other specialized units are not included.
- Weight and mass are treated as the same thing, which is correct for everyday use on Earth. The tool does not adjust for altitude, gravity or buoyancy.
- Do not rely on this page alone for medication doses, infant formula, legal trade weights or load ratings. Use the figures supplied by the prescriber, manufacturer or regulator, and ask a professional if you are unsure.
Key Terms
- Avoirdupois
- The system of weights used for ordinary goods in the US and UK, in which a pound has 16 ounces. The ounce in this converter is the avoirdupois ounce.
- Stone
- A British unit equal to 14 pounds, used mainly for human body weight in the United Kingdom and Ireland, usually written as stone and pounds.
- Short ton
- The US ton, equal to 2,000 pounds or about 907.18 kilograms. It is called a short ton to distinguish it from the metric and long tons.
- Metric ton
- A mass of 1,000 kilograms, also called a tonne. It is equal to about 2,204.6 pounds.
- Troy ounce
- A unit of about 31.1 grams used for precious metals such as gold and silver. It is heavier than the avoirdupois ounce and is not offered in this tool.
- Mass
- The amount of matter in an object. It does not change with location, while weight as a force would, which is why everyday scale readings can be treated as mass.
Related guides
Frequently Asked Questions
How many pounds are in a kilogram?+
One kilogram equals approximately 2.20462 pounds.
What is a stone?+
A stone is a traditional British unit of weight equal to 14 pounds, still commonly used for body weight in the UK and Ireland.
How many ounces are in a pound?+
There are 16 ounces in one pound.
What's the difference between a US ton and a metric ton?+
A US (short) ton is 2,000 pounds, or about 907.18 kilograms. A metric ton is exactly 1,000 kilograms, or about 2,204.6 pounds — roughly 10% heavier than a US ton. The UK's separate "long ton" (2,240 pounds) isn't included as its own unit here.
Is "weight" here the same thing as mass?+
Yes — in everyday use and in this calculator, weight and mass are treated interchangeably, which holds true for objects on Earth's surface. True weight is technically a force that varies with gravity, but that distinction only matters in contexts like spaceflight, not everyday conversions.
How do I convert pounds and ounces, like a baby's birth weight, to kilograms?+
Turn the ounces into a fraction of a pound by dividing by 16, add the pounds, and enter that single number with Pounds as the From unit. A baby of 7 pounds 8 ounces is 7.5 pounds, which is about 3.4 kilograms. Hospitals often record both figures, so the conversion helps relatives abroad. For very small babies, convert to grams to keep more detail.
Is a troy ounce the same as a regular ounce?+
No. The ounce in this tool is the avoirdupois ounce of 28.3495 grams, used for food and everyday goods. A troy ounce, used for gold, silver and platinum, is about 31.1035 grams, roughly 10 percent heavier. Using the wrong ounce makes a noticeable difference in value, so for bullion use the troy ounce figure given by the dealer instead of this converter.
Can I convert cups or tablespoons of an ingredient to grams here?+
Not on its own. Cups and spoons measure volume, while grams measure mass, and the relationship depends on density. A cup of flour weighs far less than a cup of honey. Use a conversion chart for that specific ingredient, or better, weigh it directly. Once you have an ounce or pound figure, this tool will convert it to grams.
What is a quick way to convert kilograms to pounds without a calculator?+
Double the kilograms and add 10 percent of the doubled number. For 70 kilograms, double to 140 and add 14 for roughly 154 pounds. The exact figure is about 154.3. The method works because a kilogram is 2.2046 pounds. For pounds to kilograms, halve the number and subtract 10 percent, which gets you within a pound or so.
How do I write a result as stone and pounds?+
Convert your weight to pounds, divide by 14 and keep the whole number as the stone. The remainder is the pounds. For example, 79.4 kilograms is about 175 pounds, which divided by 14 gives 12 with a remainder of 7, so 12 stone 7 pounds. The tool itself shows stone as a decimal, so 12.5 stone is the same weight written differently.
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