Kilograms to grams
Multiply kilograms by 1,000 to get grams.
1.5 kg = 1,500 g
How to convert kilograms to grams
The gram is one thousandth of a kilogram (10⁻³ kg) in the SI. The kilogram is the SI base unit of mass, fixed since 2019 by defining the Planck constant as exactly 6.62607015×10⁻³⁴ J·s.
Worked example — 1.5 kg: 1.5 × 1,000 = 1,500 g.
Kilograms to grams table
| Kilograms | Grams |
|---|---|
| 0.1 kg | 100 g |
| 0.25 kg | 250 g |
| 0.5 kg | 500 g |
| 1 kg | 1,000 g |
| 1.5 kg | 1,500 g |
| 2 kg | 2,000 g |
| 5 kg | 5,000 g |
| 10 kg | 10,000 g |
Reverse and related
About kilograms and grams
Kilogram (kg)
1 kg = 1,000 gDefinition. The SI base unit of mass, fixed since 2019 by defining the Planck constant as exactly 6.62607015×10⁻³⁴ J·s
History and origin
The kilogram began in 1795 as the mass of one litre of water at the melting point of ice, and from 1889 was embodied in a platinum-iridium cylinder kept near Paris, the International Prototype Kilogram. In 2019 the SI retired that physical artefact and redefined the unit through a fixed value of the Planck constant, leaving its size unchanged.
Current use
It is the base unit of mass almost everywhere on Earth. The main everyday exception is the United States, where people weigh in pounds even though US science, medicine and industry work in kilograms.
Source: BIPM, The International System of Units (SI), 9th ed. (2019)
Gram (g)
1 g = 0.001 kgDefinition. One thousandth of a kilogram (10⁻³ kg) in the SI
History and origin
The gram was the original base of the metric system set out in 1795, defined as the mass of one cubic centimetre of water at the melting point of ice, before the larger kilogram was chosen as the SI base unit. It is now simply one thousandth of a kilogram.
Current use
Grams are the everyday metric unit for small masses: recipe ingredients, nutrition labels, medicine doses and postage.
Source: BIPM, The International System of Units (SI), 9th ed. (2019)
Where people use this
Kilograms: body weight outside the US, groceries and produce, checked-luggage limits. Grams: recipe and food weights, nutrition labels, postage. 1 kg is 1000 g exactly.
Every value is carried to full double precision; the display is rounded.
Both units are defined in BIPM, The International System of Units (SI), 9th ed. (2019).
Questions people ask
How many grams are in a kilogram?
One kilogram is exactly 1000 grams. To convert kg to grams, multiply by 1000.
How many grams is 2.5 kg?
2.5 kg is 2500 grams, and 0.5 kg is 500 grams.
Is a kilogram exactly 1000 grams?
Yes. The gram is defined as one thousandth of a kilogram, so the conversion is exact.