UtilitiesHub

Weight Conversion

Convert kilograms (kg), pounds (lb), grams, ounces, stone and 10 more weight units from metric, imperial and US customary systems. Type in either box for two-way results, see what the weight means in real life, read it in body weight units (kilogram, pound and stone), follow the formula worked out live, and even convert an entire list of weights at once. Free, fast and accurate.

Convert From --
Convert To --
Enter a weight value to convert

See It In Real Life

Your weight compared to everyday things you have probably seen: apples, chickens, gallon jugs of water, bags of cement, average adults and small cars.

Updates as you type

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Body Weight Units (kg, lb, stone)

See your weight the way scales display it around the world: kilograms, pounds, and the British stone and pounds pairing. One stone equals exactly 14 pounds (about 6.35 kg).

1 st = 14 lb
-- kilograms (kg)
-- pounds (lb)
-- stone + pounds (st lb)
Enter a weight at the top and see it in kilograms, pounds and stone right here, plus a real-world size tag.

Common Weights Reference

Common Weights (kg) Converted (Pound)

Batch Weight Converter

Convert a full list of weights at once. Type one value per line, pick the unit pair, and press Convert All.

One click for the whole list

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How to Use the Weight Converter

1

Enter a weight value

Type any number in the left box (Convert From). You can also type in the right box (Convert To) and the converter works backward, filling the source box for you. The default starts at 10 kilograms.

2

Pick the source unit

Click the unit button on the left and choose from kilograms, pounds, grams, ounces, stone, carats, grains, tons and more in the searchable picker. The quick chips (Kilogram, Gram, Pound, Ounce, Stone) select with one click.

3

Pick the target unit

Click the unit button on the right and choose the unit you want to see, or click the number on the right to convert backward. The rate badge on each panel, for example 1 Kilogram = 2.204622622 Pound, keeps the multiplier visible at all times.

4

Swap and copy

Press the arrow button between the two panels to swap the units instantly, or use Ctrl+Shift+S from anywhere on the page. Use the copy button next to the result to copy the converted value to your clipboard in one click.

5

See it in real life

Read the See It In Real Life card to compare your weight to familiar things such as apples, chickens, gallon jugs of water, bags of cement, average adults and small cars. The Body Weight Units card shows your weight as kilograms, pounds, and stone plus pounds, the way British and US scales display it.

6

Follow the live formula

Check the Live Conversion Formula card to see the exact multiplier written out with your numbers, for example 10 kg x 2.204622622 = 22.04622622 lb. Weight conversions are linear, so you can verify every result by hand any time.

7

Use the reference tools

The All Weight Units at a Glance card shows your value in every supported unit as colored tiles with icons (click any tile to switch the Convert To unit there and then). The Common Weights Reference table pre-converts everyday amounts such as a paper clip, an apple, a newborn and a small car into your target unit.

8

Convert whole lists

Use the batch converter to turn a whole list of weights into another unit in one click, for example a column pasted from a spreadsheet. Pick the from and to units, type one value per line, press Convert All, and copy the whole converted column with Copy Results.

Weight Conversion Made Simple: A Practical Handbook

Ever found yourself confused trying to convert between pounds and kilograms, or wondering how many grams are in an ounce? You are not alone. Whether you are an international traveler, a home cook adapting recipes, a fitness enthusiast tracking body weight, or a professional in logistics and manufacturing, weight conversion is a skill you use regularly. The good news is that it does not have to be complicated. In a world where we constantly deal with different measurement systems across borders and industries, having a reliable weight converter at your fingertips saves time, reduces errors, and removes the headache of manual calculations.

Weight measurements play a crucial role in nearly every aspect of modern life. From pharmaceutical dosages that need to be precise down to the milligram, to international shipping that relies on accurate ton measurements, the stakes can be high. When a doctor prescribes medication in milligrams but you need to verify it against a chart listing dosages in other units, or when you are shipping products internationally and need to convert between short tons, long tons and metric tons, getting the conversion right is not just convenient, it is essential.

The Main Weight Measurement Systems

Metric Weight (Kilograms, Grams, Milligrams): The international standard, used almost everywhere for everyday measurements, food, science and trade. One kilogram equals exactly 1,000 grams, and one gram equals 1,000 milligrams. A metric ton is exactly 1,000 kilograms. The decimal basis makes metric conversions a matter of moving the decimal point.

Imperial Weight (Pounds, Ounces, Stone, Long Ton): Used in the UK, the US and historically in Commonwealth countries. One pound equals 16 ounces, one stone equals 14 pounds, and one long ton equals 2,240 pounds. The irregular fractions make mental math harder than the clean metric system, which is exactly why a converter earns its keep.

US Customary Weight (Pounds, Ounces, Short Ton): The everyday system in the United States. A pound is defined as exactly 0.45359237 kilograms, and a US (short) ton equals 2,000 pounds, lighter than both the metric ton and the imperial long ton.

Why Weight Conversion Needs Care

The three kinds of ton are not equal: A short (US) ton is 2,000 pounds, about 907 kg. A metric ton is exactly 1,000 kg, about 2,204.6 pounds. A long (UK) ton is 2,240 pounds, about 1,016 kg. Confusing them in shipping, construction or agriculture can change an order by more than 10 percent.

Fluid ounces are not weight ounces: A fluid ounce is a volume, while an ounce (oz) is a weight of about 28.35 grams. For water the two happen to be close, but for other liquids such as oil or honey they diverge sharply, so confusing the two causes cooking and pharmacy mistakes. This converter deals in weight only; if you need volume, use the volume converter.

Weight and mass are different in physics: Mass is the amount of matter in an object and stays constant everywhere. Weight is the force of gravity on that mass, so it varies with location. For everyday purposes such as cooking, shipping and personal weight tracking, the two are treated as the same, which is what every practical scale does.

Carats only for gems: The carat is used almost exclusively for precious stones and pearls. One carat equals exactly 0.2 grams or 200 milligrams. It measures weight, not purity or size, so it is easy to confuse with quality marks on jewelry.

All the Features of This Weight Converter

This tool is built to do far more than a single one-way calculation. Here is everything it can do, in plain words:

  • Two-way conversion: Type a value in Convert From and see Convert To update instantly. Type in Convert To instead and the source box updates. You can work backward without clearing anything.
  • 11 units in one place: Grains, milligrams, carats, grams, ounces, pounds, kilograms, stone, short tons, metric tons and long tons, all in a single picker.
  • Searchable unit picker: Click the unit button on either panel to open the picker. Type a name such as Stone or a code such as st and the list filters as you type.
  • Quick unit chips: One-click shortcuts for the most common units on both panels. The active unit is highlighted on each side.
  • One-click swap: Press the arrow button between the panels to reverse the units, or use Ctrl+Shift+S. The values follow the swap automatically.
  • Copy result button: Copy the converted weight to your clipboard with one click, ready to paste into notes, orders or messages.
  • Rate readouts: Each panel shows an always-visible reference such as 1 Kilogram = 2.204622622 Pound, so you can see the multiplier at a glance.
  • See It In Real Life: A card that compares your weight to everyday things you have seen, such as apples (0.15 kg), chickens (1.5 kg), gallon jugs of water (3.785 kg), bags of cement (50 kg), average adults (70 kg) and small cars (1,300 kg). This is the fastest way to feel how heavy or light a number actually is.
  • Body weight units: A dedicated card shows your weight in kilograms, pounds, and the British stone plus pounds format (10 kg = 1 st 8 lb), with a real-world size tag that tells you whether it is in newborn, dog, adult or vehicle territory.
  • All weight units at a glance: A dedicated card shows your value in every supported unit as colored tiles with icons. Click any tile to switch the Convert To unit there and then, no picker needed.
  • Live conversion formula: The exact multiplier is written out with your numbers, so you can see how 10 kg becomes 22.04622622 lb and verify every conversion by hand.
  • Common weights table: Everyday amounts such as a paper clip, an apple, a newborn and a small car are pre-converted into your chosen target unit. The row matching your amount is highlighted.
  • Batch converter: Convert a whole list of weights at once. Type one value per line (for example a column copied from a spreadsheet), choose the from/to unit pair, press Convert All, and every line is converted together.

Real-World Weight Conversion Scenarios

  • Cooking and recipe adaptation: A British recipe lists flour in grams, but your kitchen scale shows ounces. The converter turns 500 g into about 17.64 oz in an instant, no guesswork between recipes.
  • Fitness and health: Your gym in one country measures in kilograms, your doctor in another uses pounds. A person who weighs 80 kg is about 176.37 lb, and the body weight card also shows that as 12 st 8 lb for settings that use stone.
  • International shipping: Businesses sending packages internationally need to convert between short tons, long tons and metric tons for customs declarations, billing and regulatory compliance. The three types of ton never mix if you pick the right one.
  • Scientific research: Chemists and biologists working with international teams must ensure everyone is on the same page when it comes to milligrams, grams and kilograms.
  • Precious metals and gems: Traders often deal with both metric and imperial measurements, and jeweler work uses carats for gemstones. A 2-carat diamond is 0.4 grams.
  • Construction and manufacturing: Materials might be specified in metric tons in the design but invoiced in pounds by suppliers in different countries. The batch converter turns whole material lists into the unit your supplier wants.

Common Weight Reference Points to Know

These everyday weights are useful anchors. You will find most of them again on the cards and tables inside the tool:

  • Paper clip: about 1 g
  • Sheet of paper: about 5 g
  • Apple: about 150 g = 0.15 kg
  • Packet of butter: about 450 g = about 1 lb
  • Liter of water: exactly 1 kg (about 2.2 lb)
  • Newborn baby: about 3.5 kg
  • Stone: exactly 14 lb = about 6.35 kg
  • Bag of cement: 50 kg = about 110 lb
  • Average adult: about 70 kg = about 154 lb
  • Metric ton: exactly 1,000 kg = about 2,204.6 lb

The Math Behind Weight Conversions

If you are curious about the why behind the conversions, here is the rule. Weight conversions are linear: every unit has a fixed factor relative to a base unit, and you convert by multiplying by the ratio of the two factors. This tool uses kilograms as its internal base.

  • Convert to base: value x fromFactor = value in kilograms. For example 10 pounds x 0.45359237 = 4.5359237 kg.
  • Convert from base: value in kilograms / toFactor. So 4.5359237 kg / 0.001 = 4,535.9237 grams.
  • Equivalent shortcut: result = value x (fromFactor / toFactor). So 10 pounds x (0.45359237 / 0.001) = 4,535.9237 grams.

The Live Conversion Formula card writes out that multiplier with your actual numbers every time, so you can follow along and verify any conversion by hand.

Tips for Working With Weight Values

  1. Memorize the kilogram: 1 kg is about 2.2046 lb. For quick mental math, double the kilograms and add 10 percent: 70 kg to about 154 lb.
  2. Remember the metric anchors: 1,000 mg = 1 g and 1,000 g = 1 kg, so the metric chain is just moving the decimal point.
  3. Keep the tons apart: Short ton 2,000 lb, metric ton 2,204.6 lb, long ton 2,240 lb. When you read "ton" with no qualifier, ask which one, and use the correct unit in the converter.
  4. Use stone for UK body weight: If you talk weight with someone in the UK, stone plus pounds is common. The body weight card works it out in one step: 1 stone = 14 lb.
  5. Check the real-life card: If your conversion says your "small parcel" weighs 1,300 kg, you mixed up units. The See It In Real Life card will call that out by comparing to a small car.
  6. Swap to check the inverse: Press the arrow button between the panels or Ctrl+Shift+S to flip the two units instantly. If 80 kg reads as 176.37 lb, swapping shows the same value the other way around, which is a great sanity check before you send a number anywhere.
  7. Batch before you send: For ingredient lists or stocktaking, run the batch converter once and copy the column instead of converting each number by hand.
  8. Keep precision where it matters: This tool uses exact international conversion factors. For medical, chemical or legal applications, always double-check with official references.

Frequently Asked Questions About Weight Conversion

In everyday language we use "weight" and "mass" interchangeably, but scientifically they are different. Mass is the amount of matter in an object and stays constant regardless of location. Weight is the force of gravity acting on that mass, so technically your weight changes slightly with elevation or location on Earth. However, for practical purposes like cooking, shipping and personal weight tracking, this distinction rarely matters. Our converter treats them as the same for practical applications.
It is mostly historical tradition. The US adopted imperial measurements before the metric system existed, and by the time metric was established in France in 1799, changing entire systems would have been enormously expensive. There have been multiple attempts to switch America to metric, in the 1970s there was even a push to metricate, but public resistance and the cost of conversion kept the status quo. Interestingly, American science and industry actually use metric extensively; it is primarily in consumer applications that pounds and ounces persist.
Very accurate. We use the official conversion factors recognized by the International System of Units (SI). For example, 1 pound is defined as exactly 0.45359237 kilograms, and our converter uses these precise values. The displayed results are accurate to many decimal places, though for most practical applications you might round to the nearest sensible value. For scientific work requiring extreme precision, you can use all the decimal places provided.
A short ton (US) is exactly 2,000 pounds, about 907 kg. A metric ton is exactly 1,000 kg, about 2,204.6 pounds. A long ton (UK) is exactly 2,240 pounds, about 1,016 kg. So the metric ton sits between the two imperial tons. Confusing them in shipping or construction can change an order by more than 10 percent, which is why this converter keeps all three as separate selectable units.
One avoirdupois ounce (the kind used for food and body weight) is exactly 28.349523125 grams. That is the same ounce as 1/16 of a pound. A fluid ounce, on the other hand, is a volume and not the same thing at all. For quick mental math, treat one ounce as about 28 grams, and use the converter when you need the exact number.
The Body Weight Units card displays your value three ways: in kilograms, in pounds, and in the British stone plus pounds format, for example 1 st 8 lb. It uses the exact rule that 1 stone equals 14 pounds (about 6.35 kg). It also adds a real-world size tag that tells you whether your weight is in newborn, dog, adult, two-adult or vehicle territory. This is handy when scales and health records differ between countries.
The See It In Real Life card compares your weight to everyday objects so a bare number becomes tangible. It shows about how many apples (0.15 kg), chickens (1.5 kg), gallon jugs of water (3.785 kg), bags of cement (50 kg), average adults (70 kg) or small cars (1,300 kg) your weight equals. For example, 10 kg shows as about 67 apples, which makes it obvious how heavy or light a number actually is.
The All Weight Units card shows your converted value in all 11 supported units at once, each as a colored tile with an icon, its code and the number. The tile for your source unit is highlighted. Click any other tile to switch the Convert To unit to that unit immediately, no picker needed. It is the fastest way to hop between kilograms, pounds, stone, grams, ounces and every other unit in a single click.
The Live Conversion Formula card writes out the exact multiplier for your conversion with your actual numbers, for example 10 kg x 2.204622622 = 22.04622622 lb. Because weight conversions are linear, every result follows this one formula, and you can verify any conversion by hand. It exists so the tool is never a black box: the math is always visible.
A stone is exactly 14 pounds, which equals about 6.35 kilograms. It is used mainly in Britain and Ireland for expressing body weight and sometimes in agricultural and some industrial contexts. The word comes from the historical practice of using actual stones as weights. While kilograms are standard in most of Europe, UK speakers often say "12 stone" or "12 st 6 lb" instead of 78.5 kg, so the body weight card in this tool converts both ways for you.
Absolutely. In fact, this is one of the most common uses of weight converters. Bakers often need to convert recipes between metric and imperial measurements, for example grams to ounces or pounds. Just keep in mind that for cooking, weight conversions are more accurate than volume conversions for ingredients like flour. Many European recipes list ingredients in grams, while American recipes use ounces and cups, so our converter makes adapting recipes much easier.
While our converter is accurate, for medical dosages you should always verify conversions with official medical references or consult a healthcare professional. Medication safety is critical, and even tiny errors can be significant. Use our converter as a reference tool to double-check your calculations, but never rely solely on it for medical purposes without professional verification. When in doubt, ask your doctor or pharmacist.
Yes. Our converter handles extremely large numbers, like converting thousands of metric tons, and extremely small numbers, like converting fractions of a grain or milligram. Very large and very small results are shown in scientific notation automatically so they stay readable. The displayed results use the exact international conversion factors in every case.
The batch converter works on whole columns of numbers. Pick the from unit and the to unit, then type one weight per line in the left box (for example a column pasted from a spreadsheet, 10, 2.5 and 150 on separate lines). Press Convert All and the right box fills with every line converted at once. Press Copy Results to copy the column, still one value per line. Non-numeric lines are kept so you can stagger comments alongside your figures.