Conversion Tool

Unit Converter

Free Unit Converter - Convert between different units of measurement including length, weight, temperature, volume, and more. No login, no sign in, no registration required. Instantly convert units for cooking, construction, science, and everyday calculations.

Unit converter

Select a category, enter a value, and choose units to convert.

Convert units in minutes

Convert between different units instantly, all without leaving your browser.

Select unit category

Choose from length, weight, temperature, volume, area, or time. We support multiple unit categories.

Each category has its own set of units.
Switch categories anytime to convert different types.

Enter value and select units

Enter the value you want to convert and select the source and target units.

Supports decimal numbers and scientific notation.
Select from unit dropdowns for easy conversion.

Get instant conversion

See the converted value immediately. All calculations happen in real-time.

Results update as you type or change units.
Precise calculations with proper rounding.

Copy or download

Copy the result to clipboard or download it as a text file.

Download files keep UTF-8 encoding.
Copy buttons work instantly with all conversions.

Where teams rely on unit conversion

Speed up engineering, cooking, and scientific work with instant unit conversions.

Engineering & construction

Convert between metric and imperial units for engineering projects and construction work.

Convert length measurements (meters to feet).
Convert weight measurements (kilograms to pounds).
Convert area measurements (square meters to acres).

Cooking & recipes

Convert measurements for cooking and baking between different unit systems.

Convert volume measurements (liters to cups).
Convert weight measurements (grams to ounces).
Convert temperature (Celsius to Fahrenheit).

Science & education

Convert units for scientific calculations, experiments, and educational purposes.

Convert temperature scales (Celsius, Fahrenheit, Kelvin).
Convert time units (seconds to hours).
Convert volume measurements (liters to milliliters).

Unit conversion best practices

Follow these guidelines to use unit conversions effectively and accurately.

Accurate conversion practices

Use unit conversions correctly for engineering, science, and everyday applications.

Always verify critical conversions using multiple sources, especially for scientific or medical applications.
Be aware of different unit systems (metric vs imperial) when converting measurements.
Temperature conversions require special formulas—use the temperature category for accurate results.
Round results appropriately based on your precision needs.
Double-check unit selections to ensure you're converting between compatible units.
Use scientific notation for very large or very small numbers.
Remember that some conversions are approximate (e.g., months to seconds assumes 30-day months).

Unit converter FAQs

Get answers about accuracy, categories, and the converter's capabilities.

Does conversion happen locally?

Yes. Everything runs in your browser—no data leaves your device. All calculations are performed locally using JavaScript.

How accurate are the conversions?

Conversions use standard conversion factors and are accurate to many decimal places. However, some conversions (like months to seconds) use approximations. For critical applications, always verify with authoritative sources.

Can I convert between different unit categories?

No. You can only convert within the same category (e.g., meters to feet within length). To convert between categories, you would need to perform multiple conversions or use specialized tools.

What temperature scales are supported?

We support Celsius, Fahrenheit, and Kelvin. Temperature conversions use the standard formulas: Fahrenheit to Celsius: (F - 32) × 5/9, Celsius to Kelvin: C + 273.15.

Can I download the conversion result?

Yes. Use the download button to save the conversion result as a UTF-8 text file. The file will contain the converted value with its unit symbol.