About Unit Converter
Unit Converter is a free online collection of measurement conversion tools designed to make everyday and technical calculations easier to understand.
Instead of showing only a converted number, our goal is to provide the information behind the calculation. Converter pages can include the conversion formula, calculation steps, unit definitions, common reference values and related conversions.
The website covers commonly used metric, imperial, US customary and other measurement systems across categories such as temperature, mass, length, volume, area, speed, pressure, energy, data storage and time.
Whether you're checking a recipe measurement, completing homework, comparing measurements from different countries or working with technical data, you can enter a value and calculate the equivalent measurement directly in your browser.
Unit Conversions for Everyday, Academic & Professional Use
Unit conversion appears in many everyday situations. Recipes may use cups while ingredients are measured in millilitres or grams. Travel information can show kilometres while another country uses miles. Weather forecasts may report Celsius or Fahrenheit. Fitness devices can display kilometres, miles, kilograms or pounds.
Students and engineers frequently move between measurement systems when solving scientific and technical problems. Data professionals work with storage units and transfer speeds, while construction, manufacturing and logistics commonly require length, area, volume, mass and pressure conversions.
Our goal is to make these conversions easy to calculate while also showing enough information to understand how the answer was obtained.
How to Use Our Unit Converter Tools
- Select a category: Choose from Temperature, Weight, Length, Volume, Speed, Pressure, Data Storage, and more.
- Choose a converter: Open the specific tool you need, such as kg to lbs, cm to inches, or liters to gallons.
- Enter your value: Type an integer or decimal number into the input field.
- Get instant results: The answer updates quickly with the formula, conversion steps, and related values.
- Explore related conversions: Use quick links and nearby values to compare other common unit conversions.
How Our Conversions Are Calculated
Unit conversions work by applying a defined mathematical relationship between compatible measurement units. Where a relationship is defined exactly, our converters use that defined value during calculation and round only the displayed result when needed.
For example, one inch is exactly 2.54 centimetres. Converting 10 inches to centimetres therefore requires multiplying 10 by 2.54:
10 × 2.54 = 25.4 cm
Each converter includes the formula used, calculation steps and useful reference values so you can see how the result was calculated.
Conversion Accuracy & Rounding
Unit Converter uses established measurement relationships for its calculations. Some conversions are based on exact definitions, while others may produce repeating decimals that must be rounded for display.
When additional precision is useful, our converters retain more decimal places during the calculation before presenting the final result. The individual converter page also explains the formula and unit convention used.
Designed for Clear and Useful Conversions
⚡ Instant Results
Enter a value and see the result instantly, with no sign-up.
📐 Formula Included
See the exact formula used, not only the final number.
🧮 Step-by-Step Calculation
Follow how your value becomes the converted result.
🗂️ Multiple Measurement Categories
Length, temperature, mass, volume, speed, pressure and data.
🎯 Adjustable Precision
Show more decimal places when you need extra precision.
📱 Mobile-Friendly Tools
Works on phone, tablet and desktop, with no app to install.
Common Conversion Formulas
Common Conversion Formulas at a Glance
| Conversion | Formula |
|---|
| Celsius → Fahrenheit | °F = (°C × 9/5) + 32 |
| Fahrenheit → Celsius | °C = (°F − 32) × 5/9 |
| Kilograms → Pounds | lb = kg × 2.2046226218 |
| Pounds → Kilograms | kg = lb × 0.45359237 |
| Centimetres → Inches | in = cm ÷ 2.54 |
| Inches → Centimetres | cm = in × 2.54 |
| Kilometres → Miles | mi = km × 0.6213711922 |
| Miles → Kilometres | km = mi × 1.609344 |
| Metres → Feet | ft = m × 3.280839895 |
| Litres → US Gallons | US gal = L × 0.2641720524 |
| km/h → mph | mph = km/h × 0.6213711922 |
| GB → MB | MB = GB × 1,000 |
| GiB → MiB | MiB = GiB × 1,024 |
Conversion results may be displayed with fewer decimal places for readability. Converter pages can provide additional precision where required.
Frequently Asked Questions
Are your conversion formulas accurate?
Yes. Unit Converter uses standard mathematical formulas and commonly accepted conversion factors for metric, imperial, US customary, and scientific unit conversions.
Is Unit Converter free to use?
Yes. Unit Converter is free to use for online unit conversions. You can convert values instantly without registration.
Can I convert decimal values?
Yes. Our tools support integers and decimal values, making them useful for cooking, science, engineering, shipping, fitness, and everyday measurements.
What categories do you support?
We support many conversion categories including temperature, weight, length, volume, area, speed, pressure, power, energy, data storage, data speed, time, angle, force, fuel economy, and number system conversions.
Do I need to install an app?
No. Unit Converter works directly in your browser. You can use the website on desktop, mobile, or tablet without installing an app.