Universal Unit Converter
Convert Length, Mass, Temperature, Digital Data Storage (Bytes to Terabytes), and Speed units online.
How do I use Universal Unit Converter?
Select a measurement category (Length, Mass, Temperature, Digital Data Storage, or Speed) or click 'Load Sample Data'.
Enter your numeric value and choose the source ('From') and target ('To') units.
Click the swap button (`⇄`) to reverse units or click 'Copy' to copy the converted value.
What features does Universal Unit Converter offer?
Instant conversion across Length, Mass, Temperature, Digital Data, and Speed
Digital Data storage conversion from Bytes to Terabytes
Bidirectional unit swapping and 1-click clipboard copy
100% client-side local browser processing
SI Metric Base Units, Affine Temperature Formulas & Digital Storage Factors
Linear physical quantities convert via a canonical SI base unit (meters, kilograms, bytes, meters/second), whereas temperature uses affine offset equations.
| Category | Canonical Base Unit | Exact Conversion Factor / Formula | Common Engineering Reference |
|---|---|---|---|
| Length | Meter (m) | 1 in = 0.0254 m; 1 mi = 1,609.344 m | International yard & pound agreement |
| Mass / Weight | Kilogram (kg) | 1 lb = 0.45359237 kg; 1 oz = 28.3495 g | Exact NIST avoirdupois pound |
| Temperature | Celsius (°C) | °F = (°C × 9/5) + 32; K = °C + 273.15 | Affine scale (non-zero intercept) |
| Digital Storage | Byte (B) | 1 KB = 1,024 B ($2^{10}$); 1 GB = $1,024^3$ B | JEDEC / OS binary memory addressing |
Frequently Asked Questions about Universal Unit Converter
Why does 1 Gigabyte equal 1,024 Megabytes here instead of 1,000 Megabytes?
Operating systems (Windows, Linux RAM allocation) and JEDEC memory standards use binary powers of 2 ($1\text{ KB} = 2^{10} = 1,024\text{ Bytes}$, $1\text{ GB} = 1,024\text{ MB}$), whereas storage drive manufacturers advertise decimal SI prefixes ($10^9\text{ bytes}$). Our Data converter uses the binary $1,024$ factor.
Why can't Celsius, Fahrenheit, and Kelvin be converted by simple multiplication?
Temperature scales have different zero points ($0^\circ\text{C} = 32^\circ\text{F} = 273.15\text{ K}$), making them affine transformations ($y = mx + b$) rather than proportional ratios. Notice that $-40^\circ\text{C}$ equals exactly $-40^\circ\text{F}$.
How does the converter avoid IEEE 754 floating-point noise like `0.30000000000000004`?
All conversions are computed in 64-bit IEEE 754 double precision and formatted to 6 significant fractional digits via `toLocaleString(undefined, { maximumFractionDigits: 6 })` to strip binary rounding tails.
Are international nautical or imperial length conversions exact?
Yes. Since the 1959 International Yard and Pound Agreement, 1 inch is defined as exactly `25.4` millimeters (`0.0254 m`) and 1 foot is `0.3048 m`.
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