# What is 1 grams to kg?

Converts grams (g) to kilograms (kg) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/1-grams-to-kg
- JSON spec: https://www.acalculator.org/convert/1-grams-to-kg.json
- Version: cf2651d3dafd

## Default answer

Example with the default inputs (Grams (g) 1): 1 g = 0.001 kg.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Grams (g) | The amount in grams to convert. |
| result | Kilograms (kg) | The same amount in kilograms. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Grams (g) | The amount in grams to convert. |
| result | Kilograms (kg) | The amount in kilograms. |

## Method

kg = g × 0.001

## Assumptions

- 1 gram = 0.001 kilograms, from the exact definitions in NIST SP 811.
- The answer shows at most 6 decimal places; the calculation keeps full precision.

## Worked examples

1. value = 1 gives result = 0.001. Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 500 gives result = 0.5. Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 0.5 gives value = 500. Source: exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### What is 1 grams in kg?

1 g is 0.001 kg. The formula is kg = g × 0.001.

### How many kilograms are in a gram?

1 gram is 0.001 kilograms, from the exact unit definitions (NIST SP 811).

### How do I convert grams to kg?

Multiply by 0.001: kg = g × 0.001. For example, 1 g × 0.001 = 0.001 kg.

### How do I convert kg back to grams?

Multiply by 1,000, or type the kilograms into the second box and the converter works it out. 1 kilogram is 1,000 grams.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8. https://www.nist.gov/pml/special-publication-811