Unit Converter
Pick a category, enter a number, and every unit in that category is converted at once — no back-and-forth "convert to which?". This is arithmetic against fixed definitions, not measurement: it does not change with your screen or system.
Convert by category
| Kilometre | 0.001 |
| Metre | 1 |
| Centimetre | 100 |
| Millimetre | 1000 |
| Inch | 39.3700787402 |
| Foot | 3.28083989501 |
| Yard | 1.09361329834 |
| Mile | 0.000621371192237 |
| Nautical mile | 0.000539956803456 |
| Li (Chinese) | 0.002 |
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Number base conversion
Integers only. Values beyond 2⁵³ work too — nothing silently changes the low digits the way Number would.
| Binary | 11111111 |
| Octal | 377 |
| Decimal | 255 |
| Hexadecimal | ff |
Conversion is not measurement
There is no error bar on this page — one inch is exactly 0.0254 metres, a definition agreed in 1959, not something anyone measured. So these numbers do not vary with your device and there is no "run it a few times and take the median". The only limit comes from floating point: 0.1 has no exact binary representation, so a few results carry a tail far past the digits that matter. This page shows 12 significant digits; beyond that it is noise.
Data size: KB and KiB are different units
KB = 1000 bytes, KiB = 1024 bytes — a 2.4% difference. Drive makers use 1000, operating systems use 1024, so a 1 TB drive shows up as 931 GiB. Nobody is short-changing anybody; two unit names got mixed up. This page lists them separately and gives you both.
Temperature is affine, not a factor
Length and mass are "multiply by a number"; temperature is not. 0°C is 32°F, but 20°C is 68°F, not 640°F. So temperature takes its own path, converting into Celsius and back out — forcing it into the multiplier table gets readings wrong on both sides of zero.
Questions
Because the maker quotes TB (10¹² bytes) while the OS shows GiB (2³⁰ bytes). 1,000,000,000,000 ÷ 1,073,741,824 ≈ 931.3. Switch this page to Data size, enter 1 TB, and both numbers appear in the table. Nothing is missing; the names got mixed.
500 grams — the mainland Chinese market catty. The Taiwanese catty is 600 g and the Hong Kong one about 604.8 g, so check which one applies in your context. This page offers the mainland definition only and says so in the unit label.
For reference, estimates and documentation, yes. Be careful with precision machining or scientific work: this page shows at most 12 significant digits, and double-precision floating point stops being exact past 15–17. Those cases need a numerical library, rationals or high-precision decimals.
