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Compare the weights of petrol, diesel, jet A-1, kerosene, and LPG per litre and gallon in kg and lbs. Includes fuel density tables and tank calculations.
Read articleConvert Liters to KG
Free online calculator to easily Convert Liters to KG (or kilograms to liters) for water, milk, cooking oils, honey, fuel, and propane using precise substance density.
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How it works
Enter the volume in liters
Enter the volume in liters below and select your liquid or ingredient from the list — or choose custom density to enter your own value in kg/L.
Select direction: Convert Liters to KG or KG to Liters
Do you want to convert kilograms to liters instead? Simply switch tabs to calculate volume in liters from weight in kilograms.
Read your weight in kilograms and formula
Instantly see the exact mass in kilograms, pounds, and imperial units along with the step-by-step conversion formula.
How to Convert Liters to KG (Formula & Calculation)
To accurately Convert Liters to KG, you must account for material density because liters measure volume and kilograms measure mass. For pure water at 4°C, 1 liter equals exactly 1 kilogram. For other liquids, multiply volume by density: kg = L × density. Use our free tool above to instantly Convert Liters to KG with preset or custom density values.
Weight (kg) = Volume (L) × Density (kg/L)
Volume (L) = Weight (kg) ÷ Density (kg/L)
• Pure Water (4°C): 1 L × 1.000 kg/L = 1.000 kg
• Whole Milk: 1 L × 1.030 kg/L = 1.030 kg
• Olive Oil: 1 L × 0.910 kg/L = 0.910 kg
• Honey: 1 L × 1.420 kg/L = 1.420 kg
• Liquid Propane: 1 L × 0.493 kg/L = 0.493 kgExample
Example: To Convert Liters to KG for 5 liters of olive oil (density 0.910 kg/L), calculate: 5 × 0.910 = 4.55 kg (approx 10.03 lb). Conversely, to convert kilograms to liters: 4.55 kg ÷ 0.910 = 5 liters.
Worked examples
| Scenario | Calculation | Result |
|---|---|---|
| 1 L of water (density of water) | 1 × 1.000 kg/L | 1.000 kg |
| 2 L of cooking oil (olive oil) | 2 × 0.910 kg/L | 1.820 kg |
| 3 L of whole milk | 3 × 1.030 kg/L | 3.090 kg |
| 0.5 L of raw honey | 0.5 × 1.420 kg/L | 0.710 kg |
| 10 L of diesel fuel | 10 × 0.835 kg/L | 8.350 kg |
| 20 L of petrol / gasoline | 20 × 0.740 kg/L | 14.800 kg |
| 5 L of liquid propane | 5 × 0.493 kg/L | 2.465 kg |
Conversion reference
| Substance | Density (kg/L) | 1 Liter (kg) | 5 Liters (kg) | 10 Liters (kg) |
|---|---|---|---|---|
| Water (pure, 4°C reference) | 1.000 | 1.000 kg | 5.000 kg | 10.000 kg |
| Water (room temp, 20°C) | 0.998 | 0.998 kg | 4.990 kg | 9.980 kg |
| Salt water (seawater) | 1.025 | 1.025 kg | 5.125 kg | 10.250 kg |
| Whole milk | 1.030 | 1.030 kg | 5.150 kg | 10.300 kg |
| Cooking oil (olive oil) | 0.910 | 0.910 kg | 4.550 kg | 9.100 kg |
| Sunflower oil | 0.920 | 0.920 kg | 4.600 kg | 9.200 kg |
| Vegetable oil | 0.915 | 0.915 kg | 4.575 kg | 9.150 kg |
| Honey (pure bee) | 1.420 | 1.420 kg | 7.100 kg | 14.200 kg |
| Maple syrup | 1.370 | 1.370 kg | 6.850 kg | 13.700 kg |
| Petrol / gasoline | 0.740 | 0.740 kg | 3.700 kg | 7.400 kg |
| Diesel fuel | 0.835 | 0.835 kg | 4.175 kg | 8.350 kg |
| Engine oil (SAE 30) | 0.880 | 0.880 kg | 4.400 kg | 8.800 kg |
| Jet fuel (Jet A-1) | 0.804 | 0.804 kg | 4.020 kg | 8.040 kg |
| Crude oil (medium) | 0.855 | 0.855 kg | 4.275 kg | 8.550 kg |
| Liquid propane | 0.493 | 0.493 kg | 2.465 kg | 4.930 kg |
| Liquid butane (LPG) | 0.540 | 0.540 kg | 2.700 kg | 5.400 kg |
| Ethanol (pure alcohol) | 0.789 | 0.789 kg | 3.945 kg | 7.890 kg |
| Glycerin (glycerol) | 1.261 | 1.261 kg | 6.305 kg | 12.610 kg |
| Household bleach | 1.080 | 1.080 kg | 5.400 kg | 10.800 kg |
| Sulphuric acid (conc.) | 1.840 | 1.840 kg | 9.200 kg | 18.400 kg |
| All-purpose flour (packed) | 0.593 | 0.593 kg | 2.965 kg | 5.930 kg |
| Granulated sugar | 0.845 | 0.845 kg | 4.225 kg | 8.450 kg |
| Table salt (fine) | 1.200 | 1.200 kg | 6.000 kg | 12.000 kg |
| Wet concrete mix | 2.300 | 2.300 kg | 11.500 kg | 23.000 kg |
| Dry sand | 1.600 | 1.600 kg | 8.000 kg | 16.000 kg |
Quick facts
- Since liters are a unit of volume and kilograms are a unit of weight, density is required to bridge the two units.
- The density of water at 4°C is exactly 1.000 kg/L, establishing the standard SI baseline where 1 liter of water equals 1 kilogram.
- Cooking oils and fuels (petrol, diesel, jet fuel) are less dense than water, meaning 1 liter weighs less than 1 kilogram and floats on water.
- Honey, maple syrup, and liquid mercury are significantly denser than water, weighing between 1.37 kg and 13.5 kg per liter.
- Density in kg/L is mathematically identical to g/cm³ and g/mL, making it easy to read values directly from food or chemical product labels.
- For customized or uncommon liquids, use the custom density option to calculate exact weight in kilograms instantly.
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Read articleFrequently asked questions
To convert liters to kilograms, multiply the volume in liters by the density of the substance in kg/L: Weight (kg) = Volume (L) × Density (kg/L). Enter the volume in liters below into our conversion calculator, pick your substance or enter a custom density, and the weight in kilograms will be calculated immediately.
The liters to kilograms formula is: Mass (kg) = Volume (L) × Density (kg/L). When converting pure water at 4°C with a density of 1 kg/L, the formula simplifies to 1 L = 1 kg. For other liquids like cooking oil (0.91 kg/L) or milk (1.03 kg/L), multiply the volume in liters by the specific density.
To convert kilograms to liters, divide the weight in kilograms by the material's density: Volume (L) = Weight (kg) ÷ Density (kg/L). For example, 10 kg of diesel (0.835 kg/L) equals 10 ÷ 0.835 ≈ 11.98 liters. You can easily toggle the conversion direction right at the top of our calculator.
Because liters are a unit of volume (space occupied) and kilograms are a unit of mass or weight. Equal volumes of different liquids have different weights. For instance, 1 liter of cooking oil weighs 0.91 kg, while 1 liter of honey weighs 1.42 kg.
A liter (L) is a metric unit of volume equal to 1 cubic decimeter (1,000 cubic centimeters or 0.001 cubic meters). A kilogram (kg) is the base SI unit of mass. Historically, the kilogram was defined as the exact mass of one liter of pure water at its freezing/maximum density point (4°C).
1 liter of pure water weighs exactly 1 kilogram at 4°C. At standard room temperature (20°C / 68°F), water expands slightly, making 1 liter weigh 0.998 kg (998 grams).
1 liter of cooking oil typically weighs between 0.91 kg and 0.92 kg. Specifically, 1 liter of extra virgin olive oil weighs 0.910 kg (910 grams), which is why cooking oil floats on water.
1 liter of whole cow milk weighs approximately 1.03 kg (1,030 grams). Milk is denser than water because of dissolved solids like milk fats, proteins, lactose, and minerals.
Multiply the fuel volume in liters by its specific density: petrol is ~0.740 kg/L (20 L = 14.8 kg), automotive diesel is ~0.835 kg/L (20 L = 16.7 kg), and liquid propane is ~0.493 kg/L (20 L = 9.86 kg).
If your liquid or ingredient is not listed in the preset dropdown, select 'Custom Density (kg/L)' from the substance menu. Enter the density value from your product label or technical data sheet to calculate the exact weight in kilograms.
Free Kitchen Conversion Cheat Sheet
Never guess a measurement again. Download our free PDF cheat sheet covering litres, kilograms, cups, and grams for over 50 common kitchen ingredients.