Unit Converter
Convert length, weight, temperature, area, volume, speed and time. Instant, browser-based.
About the Unit Converter
The 69ea.com Unit Converter is a fast, browser-based tool for converting between units of length, weight, temperature, area, volume, speed, and time. All calculations happen instantly in your browser — no data is sent to any server.
Categories
- Length — meter, kilometer, centimeter, millimeter, mile, yard, foot, inch, nautical mile.
- Weight — gram, kilogram, milligram, ton, pound, ounce, carat.
- Temperature — Celsius, Fahrenheit, Kelvin (using precise formulas).
- Area — square meter, square kilometer, square foot, square yard, acre, hectare, mu.
- Volume — liter, milliliter, cubic meter, gallon (US), quart, pint, cup, fluid ounce.
- Speed — m/s, km/h, mph, knot, ft/s.
- Time — second, millisecond, minute, hour, day, week, month, year.
Common conversions
- 1 mile = 1.60934 kilometers
- 1 kilogram = 2.20462 pounds
- 100 °C = 212 °F (boiling point of water)
- 1 hectare = 2.47105 acres
- 1 gallon (US) = 3.78541 liters
- 100 km/h ≈ 62.137 mph
How to use
- Pick a category from the chip bar at the top (Length, Weight, Temperature, etc.).
- Enter the value you want to convert in the From value field.
- Choose the source unit and target unit from the dropdowns.
- The result updates instantly as you type or change units.
- Use the Swap Units button to reverse the conversion, or Copy Result to copy the value to your clipboard.
Frequently asked questions
Does this tool work offline? Once the page is loaded, all conversions run entirely in your browser. You don't need an internet connection to perform calculations.
Why is temperature handled differently? Temperature scales don't share a zero point, so they can't be converted with a simple multiplication factor. The tool uses the exact formulas: °F = °C × 9/5 + 32, K = °C + 273.15.
How precise are the results? Results are displayed with up to 10 significant digits. Very large or very small numbers use scientific notation for readability.
Are the conversion factors standard? Yes. All factors use international definitions (e.g., 1 inch = 2.54 cm exactly, 1 pound = 453.59237 g, 1 nautical mile = 1852 m).
Can I swap units quickly? Yes, click the Swap Units button to reverse the source and target units. The input value stays the same and the result recalculates instantly.