Unit Converter - Convert Length, Weight, Temperature & More
Free online unit converter for length, weight, temperature, area, volume, and time. Instant bidirectional conversions between metric and imperial units with high precision and conversion history.
Key Features
Instant Conversions
Real-time conversion between units as you type. No need to click convert buttons.
Bidirectional Conversion
Convert in both directions. Enter values in either field and get instant results.
High Precision
Accurate conversions with proper rounding for practical use and scientific precision.
Conversion History
Keep track of your recent conversions for quick reference and repeated calculations.
Popular Conversions by Category
Length
Weight
Temperature
Area
Volume
Time
Common Use Cases
Cooking & Recipes
Convert between metric and imperial measurements for international recipes.
Travel & Geography
Understand distances, temperatures, and measurements when traveling abroad.
Construction & DIY
Convert measurements for home improvement and construction projects.
Science & Education
Academic and professional work requiring unit conversions.
Fitness & Health
Track weight, distance, and other health-related measurements.
International Business
Work with measurements and specifications from different countries.
How to Use the Unit Converter
- 1Select Category: Choose the type of conversion you need (Length, Weight, Temperature, etc.)
- 2Choose Units: Select the units you want to convert from and to using the dropdown menus
- 3Enter Value: Type the value you want to convert in either input field
- 4Get Results: The conversion happens instantly as you type
- 5Save & Copy: Save conversions to history or copy results to clipboard
Conversion Tips & Best Practices
Temperature Conversions
Remember key reference points: 0°C = 32°F (freezing), 100°C = 212°F (boiling).
Imperial vs Metric
Most of the world uses metric. US primarily uses imperial. UK uses a mix of both.
Precision Matters
For cooking, round to practical measurements. For science, use full precision.
Context is Key
Consider the context - rough estimates for everyday use, precision for technical work.
Technical Information
Conversion Accuracy
- • All conversions use internationally accepted conversion factors
- • Temperature conversions account for different zero points and scales
- • Results are rounded to appropriate precision for practical use
- • Scientific notation is used for very large or very small numbers
Supported Units
- • Length: Metric (m, km, cm, mm) and Imperial (ft, in, yd, mi, nmi)
- • Weight: Metric (kg, g, t) and Imperial (lb, oz, st, tons)
- • Temperature: Celsius, Fahrenheit, Kelvin, Rankine
- • Area: Square units for all length measurements
- • Volume: Metric (L, mL) and US units (gal, qt, pt, cup, fl oz, tbsp, tsp)
- • Time: Seconds, minutes, hours, days, weeks, months, years
Privacy & Storage
- • All conversions are performed locally in your browser
- • Conversion history is stored locally on your device
- • No data is sent to external servers
- • Works completely offline once the page is loaded