Switching between metric and imperial units is something most people need to do regularly — whether you're planning an international trip, following a foreign recipe, measuring for home improvement, shipping packages overseas, or studying science and engineering. Our free online conversion calculator makes this task effortless. With support for length (meters ↔ feet, kilometers ↔ miles, centimeters ↔ inches), weight (kilograms ↔ pounds, grams ↔ ounces, metric tons ↔ pounds), and temperature (Celsius ↔ Fahrenheit ↔ Kelvin), you get fast, precise conversions right in your browser. Results appear instantly after one click, with accuracy up to 6 decimal places. Best of all? It's 100% free, ad-free, mobile-friendly, and remembers your last inputs using browser cookies so you don't have to re-enter everything next time.
Unlike search engine quick converters that show only one result at a time and often include ads, our dedicated unit converter gives you full control. Choose exactly what you want to convert, switch categories in seconds, and see clean, large-result displays that are easy to read even on small phone screens. Whether you're a student learning the metric system, a chef adapting American recipes to metric measurements, a traveler calculating distances for a road trip in Europe, or an engineer working on international projects, this conversion calculator saves time and reduces mistakes.
How to Use the Conversion Calculator
Enter Your Value and Select Units
Start by typing any number — whole or decimal — into the Value field. Positive and negative values are both supported (useful for temperature differences or signed measurements). Next, use the two dropdown menus to pick your starting unit ("From") and target unit ("To"). The options change automatically depending on the category you're in.
Tip: You can paste values directly from spreadsheets, emails, or notes — the field accepts numeric input only for clean results.
Switch Between Length, Weight, and Temperature Modes
At the top of the calculator you'll see three clear buttons: Length, Weight, and Temperature. Click any one to instantly load the appropriate units. This design prevents confusion — you won't accidentally try to convert kilograms into feet.
Length covers everyday distance measurements (travel, construction, sports). Weight handles mass for cooking, fitness, shipping and industrial use. Temperature is essential for weather, science, cooking and medical applications.
Get Instant Results with One Click
After setting everything, press the big "Convert Now" button. Within a fraction of a second the result appears in large, bold text with the target unit clearly shown. The precision goes up to six decimal places, which is especially helpful for scientific work or when small differences matter (e.g., precise ingredient measurements in baking).
Reset the Calculator to Start Fresh
Finished one set of conversions? Hit the "Reset" button to clear the value and return to default settings (1 as value, first unit selected). This makes it very convenient when comparing multiple values quickly.
Choose Your Conversion Category
The strength of this free conversion calculator lies in its focused yet powerful three-category design. Each category is carefully selected because these are the most frequently needed conversions in daily life, education, travel, and professional settings.
- Length — distances and dimensions (travel planning, home projects, sports statistics, map reading)
- Weight / Mass — body weight, ingredients, packages, industrial materials
- Temperature — weather forecasts, cooking recipes, scientific experiments, medical readings
Switching categories takes one click and refreshes only the necessary parts of the interface — keeping everything fast even on slower connections.
Length Conversions – Metric to Imperial and More
Length conversion is one of the most common needs — especially when dealing with international products, real estate listings, sports events, or road signs in different countries. Our length converter supports the most practical units used worldwide.
Meters to Feet and Inches Conversion
Conversion factor: 1 meter = 3.280839895 feet. This is the exact international standard. Example: a room 4.2 meters long = 13.7795 feet (or approximately 13 feet 9.35 inches).
Kilometers to Miles – Quick Distance Switch
1 kilometer = 0.621371192 miles. Very useful for runners (5 km race = 3.10686 miles) or drivers comparing fuel efficiency ratings between European and American cars.
Centimeters to Inches for Everyday Use
1 cm = 0.393700787 inches. Common for screen sizes (phone 15.6 cm ≈ 6.14 inches), clothing measurements, and paper sizes.
| From Unit | To Unit | Exact Factor | Example (10 units) |
|---|---|---|---|
| Meters | Feet | 3.280839895 | 32.8084 ft |
| Kilometers | Miles | 0.621371192 | 6.2137 mi |
| Centimeters | Inches | 0.393700787 | 3.937 in |
| Inches | Centimeters | 2.54 | 25.4 cm |
| Feet | Meters | 0.3048 | 3.048 m |
Weight Conversions – Kg to Lbs, Grams, Ounces & Beyond
Weight (or mass) conversions are essential in fitness tracking, international shipping, grocery shopping, laboratory work, and industrial manufacturing. Our weight converter covers the units most people actually use daily.
Kilograms to Pounds (kg to lbs) Converter
Factor: 1 kg = 2.20462262185 lbs. Example: 70 kg person = 154.3236 lbs. Very common for body weight tracking when switching between gym apps or doctor records from different countries.
Grams to Ounces – Precise Small-Weight Conversion
1 g = 0.03527396195 oz. Ideal when following American baking recipes that list butter or flour in ounces while your scale uses grams.
Metric Tons to Pounds for Heavy Loads
1 t = 2204.62262185 lbs. Useful for freight forwarders, farmers, or anyone dealing with bulk materials like grain, sand, or recycled metal.
| From | To | Factor | Example (50 units) |
|---|---|---|---|
| Kilograms | Pounds | 2.204622622 | 110.231 lb |
| Grams | Ounces | 0.035273962 | 1.7637 oz |
| Metric Tons | Pounds | 2204.622622 | 110231 lb |
| Pounds | Kilograms | 0.45359237 | 22.6796 kg |
Temperature Conversions – Celsius, Fahrenheit & Kelvin
Temperature scales differ significantly around the world. Most countries use Celsius for weather and daily life, while the United States primarily uses Fahrenheit. Kelvin is the scientific standard (absolute zero = 0 K). Our temperature converter handles all three seamlessly using exact mathematical formulas.
Celsius to Fahrenheit (°C to °F) Formula Explained
(°C × 9/5) + 32. Example: Comfortable room temperature 22°C → (22 × 1.8) + 32 = 71.6°F.
Fahrenheit to Celsius – Weather & Cooking Conversions
(°F - 32) × 5/9. Oven temperature 350°F → (350 - 32) × 5/9 ≈ 176.67°C.
Kelvin to Celsius – Scientific Temperature Switch
K - 273.15. Room temperature 293.15 K = 20°C. Very useful in physics, chemistry, and astronomy.
Expanded Temperature Reference Table
| Description | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute Zero | -273.15 | -459.67 | 0 |
| Freezing Point of Water | 0 | 32 | 273.15 |
| Room Temperature (average) | 20–22 | 68–72 | 293–295 |
| Body Temperature | 37 | 98.6 | 310.15 |
| Boiling Point of Water | 100 | 212 | 373.15 |
Why Use Our Free Online Conversion Tool?
Accurate Results with Up to 6 Decimal Places
Uses precise constants (not rounded approximations) so engineers, scientists, and professionals can trust the output.
Saves Your Last Conversion (No Re-Entering Data)
Thanks to privacy-respecting browser storage, your previous settings load automatically on return visits.
Clean, Mobile-Friendly Design for Fast Use
Responsive layout, large buttons, high-contrast text — works smoothly on phones during travel or shopping.
Completely Free – No Ads or Sign-up Required
Unlimited use without interruptions or data collection prompts.
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Common Conversions & Quick Examples
How Many Feet in a Meter? Real Example
Standard: 1 m = 3.28084 ft. Basketball hoop height 3.05 m = 10 feet exactly (common international regulation height).
Convert 100 kg to Pounds – Step-by-Step
100 × 2.204622622 = 220.4622622 lbs. Typical weight of an adult male panda or a large motorcycle.
32°F to Celsius – Everyday Temperature Check
(32 - 32) × 5/9 = 0°C — the exact freezing point of water at standard pressure.
Quick Travel Example: 500 km to Miles
500 × 0.621371192 ≈ 310.6856 miles. Roughly the driving distance from Paris to Brussels and back.
Stop searching tabs — bookmark this free conversion calculator and convert anything instantly whenever you need it!