Supported units
- Kilogram (kg)
- Gram (g)
- Milligram (mg)
- Pound (lb)
- Ounce (oz)
- Metric ton (t)
Conversion tool
Mass Converter
Select a category, enter a value, and convert between compatible units.
Mass units explained
Mass measures the amount of matter in an object. The kilogram is the SI base unit, while grams, metric tonnes, pounds and ounces are common in technical and commercial applications.
Common engineering uses
Mass conversion is useful for material quantities, component specifications, shipping calculations and manufacturing.
Formula
m = ρ × V
Mass can be calculated from density multiplied by volume. The kilogram is the SI base unit of mass. Mass remains the same when location changes, while weight is a force that depends on the local gravitational acceleration.
- m = mass, measured in kilograms (kg)
- ρ = density, measured in kilograms per cubic metre (kg/m³)
- V = volume, measured in cubic metres (m³)
Common conversions
| From | Equivalent value |
|---|---|
| 1 kilogram (kg) | 1,000 grams (g) |
| 1 metric tonne (t) | 1,000 kilograms (kg) |
| 1 pound (lb) | 0.45359237 kilogram (kg) |
| 1 avoirdupois ounce (oz) | 28.349523125 grams (g) |
| 1 stone (st) | 14 pounds ≈ 6.35029 kilograms |
| 1 US short ton | 2,000 pounds ≈ 907.185 kilograms |
Convert 75 kg to pounds
- Use the relationship 1 lb = 0.45359237 kg.
- Divide 75 by 0.45359237.
- 75 / 0.45359237 = 165.347 lb.
75 kg ≈ 165.35 lb
The pound used here is the international avoirdupois pound. Troy units use different definitions and are commonly used for precious metals.
Engineering applications
- Calculating material quantities and component masses.
- Checking machinery loads, payloads and lifting limits.
- Converting shipping, packaging and logistics specifications.
- Preparing recipes, formulations and process batches.
- Comparing product and equipment specifications published in different unit systems.
Common mistakes
- Confusing mass with weight. Weight is a force and is measured in newtons in SI.
- Confusing a metric tonne with a US short ton or UK long ton.
- Using avoirdupois ounces and troy ounces interchangeably.
- Treating kilogram-force as a mass unit instead of a force unit.
- Reporting a converted mass with more precision than the original measurement supports.
Frequently asked questions
How many pounds are in one kilogram?
One kilogram is approximately 2.20462 avoirdupois pounds.
How many kilograms are in one pound?
One international avoirdupois pound equals exactly 0.45359237 kilogram.
Is a metric tonne the same as a US ton?
No. A metric tonne is 1,000 kg. A US short ton is 2,000 lb, approximately 907.185 kg.
What is the difference between mass and weight?
Mass measures the amount of matter. Weight is the gravitational force acting on that mass.
Are all ounces the same?
No. An avoirdupois ounce is approximately 28.3495 g, while a troy ounce is approximately 31.1035 g.