1 kg in every unit
Values update with the converter above. Select a row to open that conversion's detailed page.
Metric
- Gram1,000 g
- Milligram1,000,000 mg
- Quintal0.01 q
- Metric ton0.001 ton
- Hectogram10 hg
- Carat5,000 ct
US / Imperial
- Pound2.204623 lb
- Stone0.157473 st
- Grain15,432.36 gr
- Ounce35.27396 oz
- Troy Ounce32.15075 ozt
Traditional and regional
- Metric pound (500 g)2 pond
- Arroba (15 kg)0.06666667 @
- Okka0.7794566 okka
- Dirham311.7827 dirhem
- Miskal207.8551 miskal
- Batman0.1299094 batman
- Byzantine Litra3.08642 litra
- Byzantine Ounce37.03704 ounkia
Scientific
- Dalton6.02214E26 Da
Popular conversions
24 pairsKilogram ↔ Gram
kg ↔ g
Gram ↔ Milligram
g ↔ mg
Kilogram ↔ Pound
kg ↔ lb
Gram ↔ Grain
g ↔ gr
Tonne ↔ Kilogram
ton ↔ kg
Gram ↔ Ounce
g ↔ oz
Pound ↔ Ounce
lb ↔ oz
Okka ↔ Gram
okka ↔ g
Okka ↔ Kilogram
okka ↔ kg
Dirham ↔ Gram
dirhem ↔ g
Okka ↔ Dirham
okka ↔ dirhem
Miskal ↔ Dirham
miskal ↔ dirhem
Batman ↔ Okka
batman ↔ okka
Byzantine Litra ↔ Gram
litra ↔ g
Byzantine Litra ↔ Byzantine Ounce
litra ↔ ounkia
Byzantine Ounce ↔ Gram
ounkia ↔ g
Gram ↔ Troy Ounce
g ↔ ozt
Ounce ↔ Troy Ounce
oz ↔ ozt
Dirham ↔ Troy Ounce
dirhem ↔ ozt
Gram ↔ Carat
g ↔ ct
Dalton ↔ Gram
Da ↔ g
Stone ↔ Kilogram
st ↔ kg
Quintal ↔ Kilogram
q ↔ kg
Pound ↔ Stone
lb ↔ st
Unit guides
18 units- What is Kilogram?kg
- What is Gram?g
- What is Milligram?mg
- What is Pound?lb
- What is Tonne?t
- What is Ounce?oz
- What is Okka?okka
- What is Dirham?dirhem
- What is Byzantine Litra?litra
- What is Byzantine Ounce?ounkia
- What is Quintal?q
- What is Stone?st
- What is Grain?gr
- What is Dalton?Da
- What is Miskal?miskal
- What is Batman?batman
- What is Troy Ounce?ozt
- What is Carat?ct
Detailed guide to Mass
Mass is a physical quantity associated with the amount of matter and the inertia of an object. The kilogram is the base unit of mass in the International System of Units.
Mass units are used in science, engineering, commerce, medicine, manufacturing and everyday measurements. Metric units use decimal relationships, while units such as the pound belong to imperial and United States customary systems.
- Physical quantity
- Mass
- SI base unit
- Kilogram
- SI symbol
- kg
- Dimension symbol
- M
- Modern definition
- Defined by fixing the numerical value of the Planck constant
Mass, pounds and everyday labels
Kilograms and grams describe mass in the metric system. Pounds and ounces are widely used in consumer, cooking and shipping contexts in the United States and elsewhere.
In ordinary conversation, weight often means mass. In a physics calculation, distinguish mass from force and use the stated units carefully.
What is mass?
Mass is a fundamental physical quantity related to an object's resistance to acceleration. It also acts as a source of gravitational interaction.
In dimensional analysis, mass is represented by M. It appears in derived quantities such as density, momentum, force, pressure and energy.
Mass and weight are not the same
Mass describes an intrinsic property of an object, while weight is the gravitational force acting on that mass. The mass of an object remains the same when its location changes, but its weight can vary with gravitational acceleration.
In the International System of Units, mass is measured in kilograms and force is measured in newtons. Everyday language often uses the word weight when technically referring to mass.
The kilogram as the SI base unit
The kilogram is the SI base unit of mass. Unlike the names of most base units, its name already contains the metric prefix kilo.
Since 2019, the kilogram has been defined by fixing the numerical value of the Planck constant. This replaced the earlier definition based on a physical metal prototype.
Metric mass units
One kilogram equals 1,000 grams. One gram equals 1,000 milligrams, so one kilogram equals one million milligrams.
Grams are commonly used for food and laboratory materials, while milligrams are suitable for medicines, chemicals and other small quantities.
The pound and other non-metric units
The pound is used in the imperial and United States customary measurement systems. One international avoirdupois pound is exactly 0.45359237 kilograms.
The lb symbol originates from the Latin word libra. Because several historical pound definitions existed, modern calculations should use the standardized international pound.
How are mass units converted?
A mass conversion preserves the physical mass while expressing it with another unit. The numerical value is multiplied by the defined relationship between the source and target units.
Metric mass conversions use decimal factors. Converting between kilograms and pounds requires the exact relationship of one pound to 0.45359237 kilograms.
Measuring mass accurately
Mass is measured with balances and scales designed for different capacities and precision levels. Laboratory balances may detect milligram or microgram differences, while industrial scales measure much larger loads.
Reliable measurements require appropriate calibration, stable environmental conditions and correct handling of the measured material.
Density, volume and mass
Mass, density and volume are related through m = ρ·V, where m is mass, ρ (rho) is density and V is volume.
Two objects with the same volume can have very different masses depending on their density — equal volumes of steel and water do not weigh the same. In the SI system, density is typically expressed in kilograms per cubic meter.
Choosing the right mass unit
Choosing a unit that matches the size of the object being measured keeps a result easy to read. A person's mass is naturally expressed in kilograms, an active drug ingredient in milligrams and a truckload in tonnes.
For extremely small masses, SI-prefixed units such as microgram, nanogram and picogram are used. When converting, it is also important to confirm whether a unit expresses mass or force — the pound (mass) and pound-force are not the same thing.
Mass unit comparison table
| Unit | Symbol | Kilogram equivalent | System | Common use |
|---|---|---|---|---|
| Nanogram | ng | 10⁻¹² kg | SI | Extremely small quantities of matter |
| Microgram | µg | 10⁻⁹ kg | SI | Pharmaceutical and laboratory measurements |
| Milligram | mg | 10⁻⁶ kg | SI | Drug dosages and chemical substances |
| Gram | g | 0.001 kg | SI | Food and small objects |
| Kilogram | kg | 1 kg | SI | Base mass measurements |
| Tonne | t | 1,000 kg | Metric | Vehicles, freight and industry |
| Ounce | oz | 0.028349523125 kg | Imperial/US | Food and small masses |
| Pound | lb | 0.45359237 kg | Imperial/US | Body and product mass |
Mass units
| Unit | Symbol | Information |
|---|---|---|
| Kilogram | kg | View unit guide |
| Gram | g | View unit guide |
| Milligram | mg | View unit guide |
| Pound | lb | View unit guide |
| Tonne | t | View unit guide |
| Ounce | oz | View unit guide |
| Okka | okka | View unit guide |
| Dirham | dirhem | View unit guide |
| Byzantine Litra | litra | View unit guide |
| Byzantine Ounce | ounkia | View unit guide |
| Quintal | q | View unit guide |
| Stone | st | View unit guide |
| Grain | gr | View unit guide |
| Dalton | Da | View unit guide |
| Miskal | miskal | View unit guide |
| Batman | batman | View unit guide |
| Troy Ounce | ozt | View unit guide |
| Carat | ct | View unit guide |