# How do I convert g/cm3 to kg/m3?

Converts grams per cubic centimeter (g/cm³) to kilograms per cubic meter (kg/m³) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/g-cm3-to-kg-m3
- JSON spec: https://www.acalculator.org/convert/g-cm3-to-kg-m3.json
- Version: 17e56eade95c

## Default answer

Example with the default inputs (Grams per cubic centimeter (g/cm³) 1): 1 g/cm³ = 1,000 kg/m³.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Grams per cubic centimeter (g/cm³) | The amount in grams per cubic centimeter to convert. |
| result | Kilograms per cubic meter (kg/m³) | The same amount in kilograms per cubic meter. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Grams per cubic centimeter (g/cm³) | The amount in grams per cubic centimeter to convert. |
| result | Kilograms per cubic meter (kg/m³) | The amount in kilograms per cubic meter. |

## Method

kg/m³ = g/cm³ × 1000 (the same as g/cm³ ÷ 0.001)

## Assumptions

- 1 gram per cubic centimeter = 1000 kilograms per cubic meter, from the exact definitions in NIST SP 811.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits.

## Worked examples

1. value = 1 gives result = 1,000. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 2.7 gives result = 2,700. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 2,700 gives value = 2.7. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### How many kilograms per cubic meter are in a gram per cubic centimeter?

1 gram per cubic centimeter is 1,000 kilograms per cubic meter, from the exact unit definitions (NIST SP 811).

### How do I convert g/cm3 to kg/m3?

Multiply by 1,000: kg/m³ = g/cm³ × 1000 (the same as g/cm³ ÷ 0.001). For example, 1 g/cm³ × 1,000 = 1,000 kg/m³.

### How do I convert kg/m3 back to g/cm3?

Multiply by 0.001, or type the kilograms per cubic meter into the second box and the converter works it out. 1 kilogram per cubic meter is 0.001 grams per cubic centimeter.

### Is g/cm³ the same as g/mL?

Yes. A milliliter is a cubic centimeter (1 L = 1 dm³), so 1 g/cm³ = 1 g/mL = 1 kg/L = 1,000 kg/m³.

### What is 1.5 g/cm³ in kg/m³?

1,500 kg/m³: 1.5 × 1,000. A gram is 0.001 kg and a cubic centimeter 0.000001 m³, so the factor is exactly 1,000.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B.8: Factors for Units Listed Alphabetically (bold factors are exact), retrieved 2026-10-19. https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8
- NIST SP 811 (2008), Chapter 4, Table 5: SI prefixes (kilo 10³, centi 10⁻², milli 10⁻³), retrieved 2026-10-19. https://www.nist.gov/pml/special-publication-811/nist-guide-si-chapter-4-two-classes-si-units-and-si-prefixes
- NIST SP 811 (2008), Chapter 4, Table 6: the liter, 1 L = 1 dm³ = 10⁻³ m³, retrieved 2026-10-19. https://www.nist.gov/pml/special-publication-811/nist-guide-si-chapter-4-two-classes-si-units-and-si-prefixes