Weight to volume converter | Chemistry
Note: A conversion table for 1 kilogram of water converted to liters is not shown because the resulting values would be extremely small (less than 0.01 liters). Consider using a smaller target unit for better precision.
How to convert from weight (mass) to volume?
Well, by definition of density we can rearrange the formula to get:
volume = mass / density
Example: How much volume does 2 kilograms of gasoline occupy in liters if the gasoline density is 750 kg/m³?
First, convert density to kg/L: 750 kg/m³ = 0.75 kg/L (since 1 m³ = 1000 L)
Plugging the values in the formula, we get
volume = mass / density = 2 kg / 0.75 kg/L = 2.67 L
Very simple isn't it? Yes, it is as simple as that. But this works fine when the density value we have (from a chart for example) is defined using the same unit of mass and volume that we will use in the formula. For different units, you need to apply conversion factors.
That is exactly the formula that we use in this calculator. You can see how this formula works reading the example above or/and choosing another one at the bottom of this page.
These tables contain the most frequently used conversion factors.
| Mass Unit | Factor to convert to kg (mcf) |
|---|---|
| milligram | 0.000001 |
| gram | 0.001 |
| kilogram | 1 |
| tonne | 1000 |
| pound | 0.45359237 |
| ounce | 0.02834952313 |
| Volume Unit | Factor to convert to m³ (vcf) |
|---|---|
| milliliter | 0.000001 |
| UK fluid ounce | 0.0000284130625 |
| US fluid ounce | 0.00002957352956 |
| UK gallon | 0.00454609 |
| US gallon | 0.003785411784 |
Note: The conversion factors shown above are exact values by international definition. The pound (0.45359237 kg) was standardized in 1959, and the US gallon (0.003785411784 m³) is defined exactly as 231 cubic inches. The varying number of decimal places reflects each unit's official definition, not measurement precision.
Data Sources & References
Material density data and descriptions are compiled from authoritative sources:
-
Mass, Weight, Density or Specific Gravity of Liquids - Simetric
Comprehensive database of liquid densities and specific gravities -
Mass, Weight, Density or Specific Gravity of Water at Various Temperatures - Simetric
Temperature-dependent water density data -
Volume to Weight conversions for common substances and materials - aqua-calc.com
Author: Aqua-Calc Team, Published: 2023 -
CRC Handbook of Chemistry and Physics - Chemical and physical properties
Comprehensive reference for chemical compounds and material properties -
ASTM International - Standards for materials testing
Technical standards for chemicals, liquids, and construction materials -
ISO Standards - International material standards
International Organization for Standardization - Material properties -
NIST (National Institute of Standards and Technology) - Measurement standards
Official US standards for weights, measures, and physical constants -
NIST Chemistry WebBook - Thermophysical properties
Database of chemical and physical property data for chemical compounds
Frequently Asked Questions
How do I convert weight to volume for chemical substances?
To convert weight to volume, you need to know the density of the substance. Different substances have different volumes per weight. For example, 1 kg of water occupies about 1 liter, while 1 kg of mercury occupies about 0.074 liters. Use our converter by selecting your substance and entering the weight.
Why do substance conversions vary?
Substance conversions vary because different chemicals have different densities. Mercury is denser than water, which is denser than alcohol. Temperature, pressure, and concentration can also affect measurements.
Is it better to measure by weight or volume?
Measuring by weight is more accurate than measuring by volume, especially for chemical substances. Laboratory professionals prefer weight measurements because they are consistent and reproducible regardless of environmental conditions.
What is the relationship between kilograms and liters?
The relationship between kilograms and liters depends on the substance’s density. For water at 4°C, 1 kilogram equals 1 liter. For other substances, you need to divide the weight by the density to find the volume.
How accurate are weight to volume conversions?
Weight to volume conversions are approximate because substance density can vary based on factors like temperature, pressure, and purity. For best results in laboratory work, use calibrated volumetric equipment for precise volume measurements.
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