# How do I convert kg to gallons?

Converts kg to gallons and back: gal = kg ÷ (density (kg/L) × 3.785411784).

- Page: https://www.acalculator.org/convert/kg-to-gallons
- JSON spec: https://www.acalculator.org/convert/kg-to-gallons.json
- Version: 34acbf6e03e2

## Default answer

Example with the default inputs (Kilograms (kg) 1, Density (kg/L) 1): 1 kg = 0.264172 gallons.

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Kilograms (kg) | The amount in kg. |
| density | Density (kg/L) | Water is 1 kg/L; milk about 1.03, olive oil about 0.91. |
| result | US gallons (gal) | The same amount in gallons. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Kilograms (kg) | The amount in kg. |
| density | Density (kg/L) | Water is 1 kg/L; milk about 1.03, olive oil about 0.91. |
| result | US gallons (gal) | The amount in gallons. |

## Method

gal = kg ÷ (density (kg/L) × 3.785411784)

## Assumptions

- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up.

## Worked examples

1. value = 3.785412, density = 1 gives result = 1. Source: NIST SP 811 (2008), Appendix B.8: 1 US gallon = 3.785411784 L.
2. value = 10, density = 1 gives result = 2.641721. Source: NIST SP 811 (2008), Appendix B.8: 1 US gallon = 3.785411784 L.
3. value = 1, density = 0.92 gives result = 0.287144. Source: NIST SP 811 (2008), Appendix B.8: 1 US gallon = 3.785411784 L.

## FAQ

### How do I convert kg to gallons?

Divide the kilograms by the density in kg/L to get liters, then divide by 3.785411784 liters per US gallon: gal = kg ÷ (density × 3.785411784).

### How many gallons is 1 kg of water?

1 ÷ 3.785411784 = 0.264172 US gallon, at 1 kg per liter. 10 kg of water is 2.641721 gallons.

### How much does a gallon of water weigh?

About 3.785 kg (8.345 lb), because a US gallon is 3.785411784 liters and water is about 1 kg per liter.

### Are these US or UK gallons?

US gallons, 3.785411784 L (NIST SP 811). A UK (imperial) gallon is 4.54609 L, so the same weight is about 17% fewer UK gallons.

### What density should I use?

Water is 1 kg/L. From USDA cup weights (kg/L = grams per cup ÷ 236.5882365): whole milk about 1.03, olive oil about 0.91, and honey about 1.43. A label or a data sheet gives the exact density of other liquids.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Table 5 (SI prefixes) and Appendix B.8 (factors for units listed alphabetically), retrieved 2026-10-05. https://www.nist.gov/pml/special-publication-811
- Tanaka, M. et al. (2001), Recommended table for the density of water between 0 °C and 40 °C based on recent experimental reports, Metrologia 38, 301–309: pure water 999.9749 kg/m³ at 4 °C and 998.2067 kg/m³ at 20 °C, retrieved 2026-10-05. https://doi.org/10.1088/0026-1394/38/4/3
- USDA FoodData Central, SR Legacy portion weights for 1 cup: FDC 168894 all-purpose flour 125 g; FDC 169655 granulated sugar 200 g; FDC 168833 brown sugar, packed 220 g; FDC 169656 powdered sugar, unsifted 120 g; FDC 171265 whole milk 244 g; FDC 173410 butter 227 g; FDC 171413 olive oil 216 g; FDC 169640 honey 339 g; FDC 169756 white rice, uncooked 185 g, retrieved 2026-10-05. https://fdc.nal.usda.gov/