Conversion Calculator
Convert between hundreds of units across 8 categories: weight, length, temperature, volume, data, speed, area, and currency. The smart base-unit approach handles even complex temperature formulas.
Conversion
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Result
1 mg = 1 mg
From
1 mg
To
1 mg
Comparison
Common Weight & Mass Conversions
Conversion Formula
1 mg = 1 mg
How Unit Conversion Works
Unit conversion works by multiplying the source value by a ratio that relates the source unit to the target unit. For most categories, every unit has a fixed conversion factor to a standard base unit (e.g., meter for length). The formula is:result = value × (factor_from ÷ factor_to)Temperature is the exception — it uses offset formulas because Celsius, Fahrenheit, and Kelvin have different zero points.
The Formula
Unit conversion is the process of changing a measurement from one unit to another while preserving the underlying quantity. Most conversions use a linear factor relative to a standard base unit per category. For example, all length conversions pass through meters — inches are multiplied by 0.0254 to get meters, and meters are divided by 0.3048 to get feet. Temperature is an exception because its scales have different zero points, so offset formulas (with addition/subtraction as well as multiplication) are required.
Variable Definitions
Conversion Factor
The multiplier that relates each unit to the category's base unit. For example, in the length category, meters are the base unit, so feet have factor 0.3048.
Temperature Scales
Celsius (water freezes at 0°, boils at 100°), Fahrenheit (freezes at 32°, boils at 212°), and Kelvin (0 K = absolute zero at −273.15°C). Temperature uses offset formulas, not simple factors.
Base Unit per Category
Each category has a reference base unit — meters for length, grams for mass, liters for volume, etc. All conversions go through the base unit.
How to Use This Calculator
- 1
Select a measurement category — weight/mass, length/distance, temperature, volume, area, speed, or data size.
- 2
Enter the numeric value you want to convert in the "From" field.
- 3
Choose the current unit ("From") and the desired unit ("To") from the dropdown lists.
- 4
The result is displayed instantly, along with the conversion formula and factor used.
- 5
Temperature conversions use special offset formulas — review the formula shown for Celsius/Fahrenheit/Kelvin.
Unit conversions pass through a base unit: inches to meters to feet using conversion factors.
Understanding the Concept
Unit conversion is essential in science, engineering, travel, cooking, and daily life. The vast majority of conversions use simple multiplication or division by a fixed conversion factor relative to a standard base unit. For example, all length conversions go through meters so that converting inches to feet actually does: inches → meters (× 0.0254) → feet (÷ 0.3048). Temperature is the exception — Celsius, Fahrenheit, and Kelvin use offset formulas that include addition or subtraction terms because their zero points differ (0°C does not equal 0°F). Understanding unit conversion helps avoid costly mistakes; the most famous example is the 1999 Mars Climate Orbiter crash, which was caused by a metric/imperial unit mismatch between two collaborating teams. This tool covers a wide range of categories including weight, length, temperature, volume, area, speed, and data storage units, making it useful for travel, international business, cooking recipes, scientific work, and engineering projects.
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