Kg to Liters Converter
Convert kilograms to liters for water, milk, cooking oil, gasoline, or diesel. Because a liter of each weighs a different amount, pick the substance and get volume in liters, milliliters, and gallons.
Example: with Weight in kilograms 1 · Substance Water (1.00 kg/L) → Volume in liters: 1 L.
- In milliliters1,000 mL
- In US gallons0.264 US gal
Computed by the calculator below using its default values. Change any input to see your own numbers.
Liters = kilograms ÷ density. Density in kg/L is the same number as g/mL, so water at 1.00 makes 1 kg equal 1 liter.
From weight to how much space it fills
Kilograms measure mass; liters measure volume. To move between them you divide by density — the mass in each liter. Water is the easy case at 1 kg per liter, so 1 kg of water is 1 liter. Denser liquids pack more mass into each liter, so a kilogram of them takes up less than a liter; lighter liquids like oil or gasoline spread out to more than a liter.
Density in grams per milliliter is numerically the same as kilograms per liter, which is why the math is a clean divide. Milk at 1.03 kg/L means a kilogram fills about 0.97 liter, while gasoline at 0.74 spreads a kilogram to roughly 1.35 liters.
When the estimate is good enough
Temperature nudges these values because warm liquids expand and cold ones contract. For shopping, shipping, and recipe math the standard densities here are close enough, but a fuel depot or a lab would correct for temperature. Use the result as a working figure, not a certified measurement.
Remember that a scale weighs the container too. Tare the bottle or subtract its weight before converting, or your liters will come out high.
How it’s calculated
Liters = kilograms ÷ density, where density is in kg/L (numerically equal to g/mL). Milliliters = liters × 1000. US gallons use 1 gallon = 3.785411784 L (NIST).
Densities are approximate and vary with temperature and composition; results are close estimates, not precise measurements.
Volume of 1 kilogram by substance
| Substance | Density (kg/L) | Volume (L) | Volume (US gal) |
|---|---|---|---|
| Water | 1.00 | 1.000 L | 0.264 gal |
| Milk | 1.03 | 0.971 L | 0.257 gal |
| Cooking oil | 0.92 | 1.087 L | 0.287 gal |
| Diesel | 0.85 | 1.176 L | 0.311 gal |
| Gasoline | 0.74 | 1.351 L | 0.357 gal |
| Honey | 1.42 | 0.704 L | 0.186 gal |
Computed with liters = 1 kg ÷ density and 1 US gallon = 3.785411784 L. Densities are approximate.
Common mistakes
- Assuming every liquid is 1 kg per liter — only water is; oil and fuel are lighter, syrups heavier.
- Mixing up density units, though kg/L and g/mL are the same number for liquids.
- Ignoring temperature — a liter of warm liquid weighs slightly less than a cold one.
- Forgetting to subtract the container weight; scales include the bottle unless you tare it.
Frequently asked questions
How do you convert kg to liters?
Divide the mass in kilograms by the substance's density in kg per liter. For water that density is 1, so 1 kg equals 1 liter; for cooking oil at 0.92 it equals about 1.09 liters.
Is 1 kg always 1 liter?
Only for water near 4°C. Other substances have different densities: a kilogram of gasoline is roughly 1.35 liters, while a kilogram of honey is about 0.70 liter.
Why does the substance matter?
Kilograms measure mass and liters measure volume. Density links the two, and it differs for every material, so you must pick the liquid to get the right volume.
How many liters is 1 kg of milk?
About 0.97 liter. Milk's density is near 1.03 kg per liter, so a kilogram takes slightly less space than a kilogram of water.