1 Kilogram equals 1,000 Grams.
| Kilogram (kg) | Gram (g) |
|---|---|
| 0.001 kg | 1 g |
| 0.01 kg | 10 g |
| 0.1 kg | 100 g |
| 1 kg | 1,000 g |
| 2 kg | 2,000 g |
| 5 kg | 5,000 g |
| 10 kg | 10,000 g |
| 25 kg | 25,000 g |
| 50 kg | 50,000 g |
| 100 kg | 100,000 g |
| 500 kg | 500,000 g |
| 1,000 kg | 1,000,000 g |
To convert Kilograms to Grams, multiply the value by 1,000. This factor comes from the ratio of the two units' definitions: one Kilogram equals 1,000 Grams.
For example: 1 Kilogram = 1,000 Grams, and 10 Kilograms = 10,000 Grams.
To convert in the reverse direction — from Grams to Kilograms — multiply by 0.001.
The kilogram is the SI base unit of mass — the unit from which all other mass units in the metric system derive. For most of its history (1889–2019), it was defined by a physical artifact: the International Prototype Kilogram (IPK), a cylinder of platinum-iridium alloy stored in a vault near Paris. In 2019, the definition was revolutionized: the kilogram is now defined by fixing the numerical value of the Planck constant to exactly 6.62607015 × 10⁻³⁴ J·s, making it the first base unit defined purely through a fundamental constant of nature.
In everyday life, the kilogram is the standard unit for body weight, food, and loads across most of the world. A liter of water has a mass of almost exactly one kilogram (0.9998 kg at room temperature). A typical adult human weighs 60–90 kg. A car weighs roughly 1,500 kg. The kilogram thus spans the range from a bag of flour to a small vehicle without requiring a change of units.
The change from artifact to fundamental-constant definition was scientifically momentous. For 130 years, the IPK was losing mass at a rate of about 50 micrograms per century relative to its official copies — a drift that was unmeasurable until metrology improved enough to notice it. The new definition eliminates this drift entirely: the kilogram is now as stable as the Planck constant itself, which is believed to be truly invariant across space and time.
The gram is one thousandth of a kilogram and the standard unit for everyday small masses in the metric world. A paperclip weighs about 1 gram; a standard die (for board games) weighs about 4 grams; a US quarter coin weighs exactly 5.67 grams; and a teaspoon of sugar is about 4 grams. The gram is familiar from food packaging worldwide, where ingredient quantities and serving sizes are listed in grams.
The gram was originally defined in 1795 as the mass of one cubic centimeter of water at 4°C (the temperature at which water reaches its maximum density). This elegant link between mass and volume meant that a liter of water weighed exactly one kilogram, and a milliliter weighed exactly one gram — relationships still useful for quick mental calculations in cooking and chemistry.
In gemology, the gram stands alongside the carat (0.2 grams) for weighing precious stones and the troy ounce (31.1 grams) for precious metals. In chemistry and pharmacology, the gram is the standard for expressing concentrations (grams per liter, g/L) and reaction quantities. Nutritionists work almost entirely in grams when discussing carbohydrates, fats, proteins, and fiber — making the gram perhaps the most broadly encountered scientific unit in everyday consumer life.
1 Kilogram equals 1,000 Grams.
To convert Kilograms to Grams, multiply by 1,000. For example, 0.1 Kilograms = 100 Grams.
1 Gram equals 0.001 Kilograms.