Unit Converter
Convert between units of length, weight, area, volume, speed, temperature, and data. Instant results with all conversions shown at once. Runs in your browser.
| Unit | Value | |
|---|---|---|
| Millimeter (mm) | 1000 | |
| Centimeter (cm) | 100 | |
| Meter (m)← source | 1 | |
| Kilometer (km) | 0.001 | |
| Inch (in) | 39.37007874 | |
| Foot (ft) | 3.280839895 | |
| Yard (yd) | 1.093613298 | |
| Mile (mi) | 0.0006213711922 | |
| Nautical Mile | 0.0005399568035 | |
| Light-year | 1.056971e-16 |
Related Tools
Unix Timestamp
Convert Unix timestamps to UTC, local time, and ISO 8601 instantly. Auto-detects seconds vs milliseconds.
Base Converter
Convert numbers between decimal, hex, binary, and octal instantly. Free and runs in your browser.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly. Runs entirely in your browser using the Web Crypto API.
Unit conversion is the mathematical process of expressing a measurement in a different unit within the same dimension. Each physical quantity (length, mass, temperature, volume, speed, area) has a coherent system of units with defined conversion factors. The International System of Units (SI) establishes base units — the metre for length, kilogram for mass, second for time, kelvin for temperature — and most non-SI units (feet, pounds, Fahrenheit, gallons) are defined in terms of these standards by fixed numeric factors.
Temperature conversion is the notable exception to simple multiplication: Celsius and Fahrenheit use different zero points (0°C ≠ 0°F), requiring offset formulas (°F = °C × 9/5 + 32; K = °C + 273.15) rather than pure ratio conversion. All other unit categories in this tool use direct multiplication by a conversion factor relative to a common base unit — metres for length, kilograms for mass, and so forth.
This tool converts between units across seven categories: Length, Weight/Mass, Area, Volume, Speed, Temperature, and Data. After selecting a category and entering a value with its source unit, all equivalent values in the other units of that category are displayed simultaneously in a table. Each row can be individually copied with a click. All conversions run in the browser with no server calls, making it suitable for use offline or in environments with restricted network access.
Common Use Cases
Converting measurements for international e-commerce and shipping
E-commerce platforms serving customers in multiple countries must display product dimensions and weights in the units their customers expect: US customers see pounds and inches; European customers see kilograms and centimetres. Developers building product listing pages convert database values — typically stored in SI units — to the user's locale-appropriate units for display. The unit converter provides the exact conversion factors needed for these calculations.
Engineering calculations across unit systems
Mechanical and civil engineers working on international projects frequently receive specifications in imperial units (PSI, BTU, feet) from US partners and must convert to SI for their calculations, or vice versa. A pipe diameter of 4 inches must be expressed in millimetres for a European supplier; a load of 10 kN must be converted to pounds-force for a US contractor. The unit converter handles these conversions instantly without referencing unit tables.
Calculating data storage and network bandwidth requirements
Infrastructure engineers sizing storage, memory, and network capacity convert between data units constantly: cloud storage is quoted in GB/TB, memory in GiB, and network throughput in Mbps or Gbps. The distinction between binary (GiB = 2³⁰ bytes) and decimal (GB = 10⁹ bytes) units matters when planning capacity and comparing vendor specifications. The data category shows both binary and decimal values simultaneously for direct comparison.
How to Use
- Select a category from the chips: Length, Weight, Area, Volume, Speed, Temperature, or Data.
- Enter a numeric value in the input field.
- Select the source unit from the dropdown.
- All equivalent values in other units appear instantly in the table.
- Click any row to copy that converted value to the clipboard.
Supported Categories
- Length — mm, cm, m, km, in, ft, yd, mi, nautical miles
- Weight / Mass — mg, g, kg, t, oz, lb, stone
- Area — cm², m², km², ft², yd², acres, hectares
- Volume — mL, L, m³, fl oz, cups, pints, gallons
- Speed — m/s, km/h, mph, knots
- Temperature — Celsius, Fahrenheit, Kelvin
- Data — bits, bytes, KB, MB, GB, TB (binary and decimal)
Quick Reference
- 1 mile = 1.60934 km
- 1 kg = 2.20462 lb
- °F = (°C × 9/5) + 32
- 1 gallon (US) = 3.78541 L
- 1 GiB = 1024 MiB = 2³⁰ bytes