Weight Converter
Convert Weight and Mass Units
Convert kilograms, pounds, grams, ounces, stones, tonnes, milligrams, micrograms, carats, and other weight or mass units for body weight, recipes, parcels, lab notes, jewelry, and bulk materials.
Choose any two mass units here, or find a converter for your measurement below. For pounds and ounces written together, start with the mixed-weight examples.
Enter weight
Pick the source unit and destination unit
Converted weight
Match the precision of your scale or form. The comparison panel keeps automatic precision; small nonzero results are never rounded to zero.
Result updates as soon as the value or unit changes.
Choose a common task
Before converting the reading
Check What the Scale Actually Measured
Changing the unit does not make the original measurement more accurate. A useful conversion starts with the right scale, a steady reading, and a clear understanding of what was included in the measured weight.
Zero and tare
Make sure the empty scale reads zero before weighing anything. When measuring ingredients, parcels, or contents inside a container, use the tare function so the container's weight is not included in the final reading.
Capacity
Keep the load within the scale's rated range. A kitchen scale, luggage scale, and freight scale are built for very different weight ranges, so using the wrong scale can produce unreliable results.
Resolution
A scale that displays weight in 1 gram steps cannot produce a trustworthy result to the nearest milligram, even after conversion. The converted value should not imply more precision than the original scale provided.
Conditions
Place the scale on a firm, level surface and wait for the reading to settle. Movement, soft flooring, vibration, or an uneven load can all affect the measured weight.
Keep Net, Tare, and Gross Weight Separate
Net, tare, and gross weight answer different questions. These terms often appear on packaging, freight documents, food labels, shipping records, and warehouse forms, so they should remain separate even when you convert them into another unit.
Net Weight
The weight of the product or contents alone, excluding the container, wrapper, pallet, or packaging.
Tare Weight
The weight of the empty container, vehicle, pallet, wrapper, or packaging before the contents are added.
Gross Weight
The full loaded weight, including both the net contents and the tare weight.
For example, if a packed parcel weighs 5.4 kg and the packaging weighs 0.4 kg, the net contents weigh 5 kg. Convert the figure that matches your task with the kilograms to pounds rather than treating net, tare, and gross weight as interchangeable.
Useful Weight Converters
Open a focused converter when you already know the unit pair you need. Use kilograms and pounds for scale readings and parcels, grams and ounces for weighed ingredients, and tonnes for bulk totals. Each link below explains a specific conversion. For stones, troy ounces, carats, or another pair, use the weight calculator above.
Convert kilograms to pounds
Compare a kilogram scale reading with a pound-based luggage limit, body-weight record, or product specification.
Convert pounds to kilograms
Translate a US scale or parcel label into kilograms for a metric form or weight record.
Convert grams to ounces
Read a gram-based ingredient weight in ordinary ounces; use this for mass, not fluid ounces.
Convert ounces to grams
Measure an ounce-based recipe ingredient on a gram scale, or convert a small package weight.
Convert pounds to grams
Turn a pound-based ingredient or package weight into grams without rounding through kilograms first.
Convert grams to pounds
Compare a gram-based product or parcel weight with a specification written in pounds.
Convert kilograms to tonnes
Express a delivery or bulk-material total in metric tonnes, each equal to 1,000 kilograms.
Convert grams to milligrams
Express a small mass in milligrams while keeping the original scale's measurement precision in mind.
Reading combined Weight units
Convert the Smaller Unit Before Adding
Pounds and ounces, or stones and pounds, are often written together as mixed-unit measurements. They should not be read as decimal numbers. Convert the smaller unit into the larger unit first, then combine the values.
Example: 2 lb 8 oz
Eight ounces is half a pound, so 2 lb 8 oz equals 2.5 lb . You can then use the pounds to kilograms converter when the value is needed for an international form, shipping document, or product record.
Example: 11 st 6 lb
Calculate 11 × 14 + 6 = 160 lb. Enter 160 in the pounds to kilograms converter to get 72.5747792 kg, or 72.6 kg to one decimal place. Do not enter 11.6 stones: that would mean 11 stones and 8.4 pounds.
Similar Unit Names Can Mean Different Things
A unit label should make both the unit and the measurement system clear. This is especially important when working with ounces, tons, and carats, where similar names can refer to different kinds of measurements.
| Term | What it means | Where it appears |
|---|---|---|
| Ounce | 28.3495 g of ordinary mass | Food, parcels, everyday goods |
| Troy ounce | 31.1035 g | Precious metals |
| Fluid ounce | A volume unit, not a mass unit | Liquids; use the volume converter |
| Ton | May mean short ton, long ton, or metric tonne | Freight and bulk goods; select US short tons or imperial long tons in the weight calculator |
| Carat / karat | Gemstone mass / gold purity | Jewelry; select carats and grams in the weight calculator |
Choosing a Practical Final Value
Converted Digits Do Not Add Accuracy
A conversion may produce several decimal places, but the original scale still determines how precise the result truly is. If a parcel scale reads only to the nearest 10 grams, the converted pound value should not be treated as exact to multiple decimal places.
Keep enough digits while you are calculating, then round the final result for the task. Body-weight trends, recipe portions, customs forms, laboratory measurements, and gemstone certificates all need different levels of precision.
Practical questions
Weight Details That Can Affect Real Decisions
Can grams be converted directly into cups or tablespoons? +
Not with one universal conversion factor. Grams measure mass, while cups and tablespoons measure volume. The correct conversion depends on the ingredient’s density and how it is prepared, scooped, packed, or leveled. When converting between weight and volume, use an ingredient-specific reference instead of a general weight converter.
Why can a shipping company charge for more weight than the scale shows? +
Shipping carriers may use dimensional weight when a parcel is large compared with its actual scale weight. Dimensional weight is calculated from the package size using a carrier-specific divisor. In many cases, the billed weight is whichever is higher: the actual scale weight or the dimensional weight.
Why would an object's weight change on the Moon while its mass stays the same? +
Mass describes the amount of matter in an object, and it does not change when the object moves from one place to another. Physical weight is the force created by gravity acting on that mass, so it becomes lower where gravity is weaker. In everyday use, kilograms and pounds are normally treated as mass measurements, even though the word “weight” is commonly used.
Is a gemstone carat the same as the karat used for gold? +
No. A metric carat is a unit of gemstone mass equal to 0.2 grams. Karat, often written with a K, describes the purity of gold and is not a weight unit.