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Formula: Mass = Density × Volume
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Mass
1 kg
1000 g | 2.2046 lb
Density
1000 kg/m³
1 g/cm³
Volume
0.001 m³
1 L | 0.2642 gal
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Common Material Densities
Click a material to use its density:
Mass Unit Conversions
| Unit | Value |
|---|---|
| Kilograms (kg) | 1 |
| Grams (g) | 1000 |
| Milligrams (mg) | 1.000e+6 |
| Pounds (lb) | 2.2046 |
| Ounces (oz) | 35.274 |
| Metric Tons | 0.001 |
Quick Answer
Mass = Density x Volume (M = D x V). To calculate: multiply the density of the material by its volume. Example: Water (1 g/cm3) with 500 cm3 volume has mass = 1 x 500 = 500 grams. Unit conversions: 1 kg = 1000g = 2.205 lb. 1 lb = 453.6g = 16 oz. Remember: mass is not the same as weight (mass is constant, weight depends on gravity).
Key Facts
- Mass = Density x Volume (M = D x V)
- 1 kilogram = 1000 grams = 2.205 pounds
- 1 pound = 453.592 grams = 16 ounces
- 1 metric ton = 1000 kg = 2204.6 lb
- Mass is constant everywhere; weight varies with gravity
- Weight = Mass x Gravity (W = mg)
- On Earth, 1 kg mass weighs 2.205 lb force
- On Moon, same mass weighs 1/6 as much
Frequently Asked Questions
How do I calculate mass from density and volume?
Mass = Density × Volume. For example, if you have 2 liters of water (density 1 g/cm³), the mass is 2 L × 1 kg/L = 2 kg. Make sure to use consistent units or convert them first.
What is the difference between mass and weight?
Mass is the amount of matter in an object, measured in kilograms. Weight is the force of gravity on that mass, measured in newtons. On Earth, weight (N) = mass (kg) × 9.81 m/s². Mass stays constant; weight varies by location.
How do I find the density of an object?
Density = Mass / Volume. Measure the object's mass with a scale. For volume, use water displacement: submerge the object and measure how much water is displaced. Divide mass by volume to get density.
Why does oil float on water?
Oil floats because it has a lower density than water. Water's density is about 1000 kg/m³, while most oils are around 800-920 kg/m³. Less dense substances float on more dense liquids.
What are common density values for materials?
Common densities in kg/m³: Water = 1000, Aluminum = 2700, Steel = 7850, Gold = 19300, Wood = 500-900, Concrete = 2400, Air = 1.2. These values help identify materials and calculate unknown masses or volumes.