Mass Calculator
Need to quickly convert 5 kilograms to pounds, or figure out the mass of a steel beam given its volume and density? A mass calculator simplifies these tasks by providing instant, accurate results without manual math.
What Is Mass?
Mass is a measure of how much matter an object contains. Unlike weight, which depends on gravity, mass remains constant regardless of location. The kilogram (kg) serves as the base SI unit, but everyday life uses many other units: grams (g), pounds (lb), ounces (oz), stones (st), and tons.
How Do You Convert Between Mass Units?
Converting between mass units involves multiplying by a fixed conversion factor. Our mass calculator eliminates the hassle by doing the math for you. Enter a value, pick the starting unit, choose the target unit, and the result appears instantly.
Here are some common conversion factors used by the tool:
- 1 kg = 1,000 g = 2.20462 lb
- 1 lb = 16 oz = 0.453592 kg
- 1 stone = 14 lb = 6.35029 kg
- 1 metric ton (tonne) = 1,000 kg ≈ 2,204.62 lb
- 1 short ton (US) = 2,000 lb ≈ 907.185 kg
- 1 long ton (UK) = 2,240 lb ≈ 1,016.05 kg
Common Conversion Factors
| Unit | Abbreviation | Equals 1 kg |
|---|---|---|
| Milligram | mg | 1,000,000 |
| Gram | g | 1,000 |
| Kilogram | kg | 1 |
| Metric ton | t | 0.001 |
| Ounce | oz | 35.274 |
| Pound | lb | 2.20462 |
| Stone | st | 0.157473 |
| Short ton (US) | ton | 0.00110231 |
| Long ton (UK) | ton | 0.000984207 |
| Carat | ct | 5,000 |
| Grain | gr | 15,432.4 |
Disclaimer: This calculator treats pounds and kilograms as units of mass. For precise weight (force) calculations, consult a dedicated weight calculator.
If you type 150 lb and select “pounds” → “kilograms,” the calculator above displays about 68.04 kg, applying the 0.453592 factor automatically. It handles 10+ units across metric and imperial systems, covering everything from milligrams to tons.
How to Calculate Mass from Density and Volume?
The calculator also works as a density‑based mass tool. When you know an object’s density and volume, use the formula:
m = ρ × V
where ρ (rho) is density in kg/m³, V is volume in m³, and m is mass in kg.
Example: A concrete block has a volume of 0.5 m³ and a density of 2,400 kg/m³. Its mass is 2,400 × 0.5 = 1,200 kg. Enter those numbers into the density mode of the mass calculator to verify the result instantly.
Disclaimer: This calculator treats pounds and kilograms as units of mass. For precise weight (force) calculations, consult a dedicated weight calculator.