DevBentoUnit Converter
Convert between length, weight, temperature, speed, area, volume, data, and time units instantly. Metric, imperial, and more. No server, no signup.
Convert Any Unit Online
This unit converter handles 8 categories with 60+ units: length, weight, temperature, speed, area, volume, data storage, and time. Select a category, pick your from/to units, type a number, and see the result instantly. Everything runs locally in your browser.
What is a Unit Converter?
A unit converter is a tool that transforms a measurement from one unit system to another using standardized conversion factors. For example, converting 100 Celsius to Fahrenheit, or 5 kilometers to miles. Most conversions use simple multiplication by a fixed factor, but temperature requires special formulas because the scales have different zero points. Unit converters are essential for international collaboration, scientific calculations, cooking, engineering, and any situation where you encounter measurements in an unfamiliar system. The two major systems are metric (used by most of the world) and imperial (used primarily in the United States).
Categories and Units
| Category | Supported Units |
|---|---|
| Length | mm, cm, m, km, inch, foot, yard, mile |
| Weight | mg, g, kg, lb, oz, stone, metric ton |
| Temperature | Celsius, Fahrenheit, Kelvin |
| Speed | m/s, km/h, mph, knots, ft/s |
| Area | mm², cm², m², km², in², ft², yd², acre, hectare |
| Volume | mL, L, gallon (US), quart, pint, cup, fl oz, tbsp, tsp |
| Data | bit, byte, KB, MB, GB, TB, PB |
| Time | ms, second, minute, hour, day, week, month, year |
How to Use
- Pick a category by clicking one of the tabs (Length, Weight, Temperature, etc.)
- Select units from the dropdown menus on each side
- Type a value in the left input field
- Read the result on the right side
- Swap the from/to units with the swap button, or copy the full conversion string
Temperature Conversion Formulas
Temperature is the only category that does not use simple multiplication. The formulas:
- Celsius to Fahrenheit:
F = C × 9/5 + 32 - Fahrenheit to Celsius:
C = (F − 32) × 5/9 - Celsius to Kelvin:
K = C + 273.15 - Kelvin to Celsius:
C = K − 273.15
Common Conversions
| Conversion | Result |
|---|---|
| 1 mile | 1.60934 km |
| 1 kg | 2.20462 lb |
| 0 °C | 32 °F |
| 100 °C | 212 °F |
| 1 GB | 1024 MB |
| 1 hour | 60 minutes |
| 1 acre | 4046.86 m² |
| 1 gallon | 3.78541 L |
| 1 inch | 2.54 cm |
FAQs
Q: Is 1 KB equal to 1000 bytes or 1024 bytes? A: This tool uses binary (IEC) units where 1 KB = 1024 bytes, matching how operating systems report file sizes. Hard drive manufacturers use decimal (SI) where 1 KB = 1000 bytes, which is why a 1 TB drive shows as ~931 GB in your OS.
Q: Why is the stone unit not included? A: Stone is a British unit of weight (1 stone = 14 lb). It is commonly used for body weight in the UK and Ireland but is not widely recognized elsewhere. You can approximate it: divide pounds by 14.
Q: Can I convert between metric and imperial? A: Yes. Every category includes both metric and imperial units where applicable. Length supports meters, kilometers, miles, feet, and inches. Weight supports kilograms, pounds, ounces, and stone. Try the Inches to Centimeters example for a quick length conversion.
Nothing you paste leaves this tab. Every tool runs entirely in your browser — no upload, no server, no account.