Grams to Kilograms Converter

What is a grams to kilograms converter?

A grams to kilograms converter changes a mass expressed in grams (g) into the equivalent mass in kilograms (kg). Both units belong to the metric system, where the kilogram is the base SI unit of mass and the gram is one thousandth of a kilogram. Because the relationship is a simple power of ten, converting between the two is quick and exact.

This tool works in both directions: enter a value in grams to see kilograms, or enter kilograms to see grams. You can also switch either field to milligrams (mg) if you are working with smaller quantities.

Formula

A kilogram contains exactly one thousand grams, so dividing grams by 1000 gives kilograms:

$\text{kilograms} = \frac{\text{grams}}{1000}$

To go the other way, multiply kilograms by 1000:

$\text{grams} = \text{kilograms} \times 1000$

How to convert grams to kilograms

1. Take the mass in grams that you want to convert.
2. Divide that number by 1000, because 1 g = 0.001 kg.
3. The result is the equivalent mass in kilograms.

The base factor to remember is that 1 gram equals 0.001 kilograms. Reversing it, 1 kilogram equals 1000 grams.

Worked examples

Example 1: 1 gram to kilograms

$1 \text{ g} = \frac{1}{1000} = 0.001 \text{ kg}$

So 1 gram is exactly 0.001 kilograms.

Example 2: 2 kilograms to grams

$2 \text{ kg} = 2 \times 1000 = 2000 \text{ g}$

So 2 kilograms is exactly 2000 grams.

Quick reference table

FAQ

How many grams are in a kilogram?

There are exactly 1000 grams in one kilogram. This makes converting from kilograms to grams as simple as multiplying by 1000.

Is the gram-to-kilogram conversion exact?

Yes. Both units are defined within the metric system, so 1 g is exactly 0.001 kg with no rounding involved. For related conversions, see the mg to g converter or the tons to pounds converter.