Unit Converter
Convert between units of length, weight, temperature, volume, and data storage with accurate formulas.
How to use this tool
- Select a category (Length, Weight, Temperature, Volume, or Data).
- Enter the value you want to convert.
- Choose the From and To units.
- The result updates automatically. Use the swap button to reverse the conversion.
Temperature conversions use actual formulas (not simple ratios). Data units distinguish between decimal units (KB, MB, GB — powers of 1000) and binary units (KiB, MiB, GiB — powers of 1024).
Standard Conversion Factors and Unit Systems
Scientific, industrial, and everyday tasks require interconverting between the International System of Units (SI Metric) and Imperial / US Customary systems. Here are the core baseline constants applied:
| Quantity | Base SI Unit | Conversion Ratios |
|---|---|---|
| Length | Meter (m) | 1 in = 0.0254 m | 1 ft = 0.3048 m | 1 mi = 1,609.344 m |
| Mass / Weight | Kilogram (kg) | 1 lb = 0.45359237 kg | 1 oz = 28.3495 g | 1 metric ton = 1,000 kg |
| Temperature | Celsius (°C) / Kelvin (K) | °F = (°C × 9/5) + 32 | °C = (°F − 32) × 5/9 |
| Volume | Liter (L) | 1 US gal = 3.78541 L | 1 US fl oz = 29.5735 mL |
High-Precision Floating-Point Calculation
BrightKit uses double-precision IEEE 754 arithmetic normalized to intermediate SI base units, minimizing rounding errors when chaining multiple unit conversions.
Frequently asked questions
Celsius is based on the freezing (0°C) and boiling (100°C) points of water. Fahrenheit sets water's freezing point at 32°F and boiling point at 212°F. Kelvin is an absolute thermodynamic temperature scale starting at absolute zero (0 K = -273.15°C).
In decimal systems (standard SI used by hard drive makers), 1 Kilobyte (KB) = 1,000 Bytes. In binary systems (used by operating systems like Windows and Linux RAM), 1 Kibibyte (KiB) = 1,024 Bytes. This tool uses standard digital data conversion ratios.
The international yard and pound agreement of 1959 legally defined 1 inch as exactly 25.4 millimeters (0.0254 meters). All length conversions (miles, yards, feet, inches to meters, kilometers, centimeters) derive from this exact conversion factor.
A US liquid gallon is defined as 231 cubic inches (approximately 3.785 liters), while an Imperial (UK) gallon is defined as exactly 4.54609 liters (approximately 20% larger than a US gallon). This converter provides US customary volume measurements.
No. Every unit conversion runs locally in your web browser with instantaneous calculation as you type or change dropdown selectors.