Unit Converter
Convert between units of length, weight, temperature, and volume.
How to Use Unit Converter
- 1Select a measurement category using the category tabs (Length, Weight, Temperature, etc.).
- 2Choose the 'from' unit in the left dropdown and the 'to' unit in the right dropdown.
- 3Enter the value you want to convert in the left input field.
- 4The converted result appears instantly in the right field.
- 5Click the ⇄ swap button to reverse the conversion, or click any row in the reference table to set it as the target unit.
Frequently Asked Questions
Which unit categories are supported?
The converter supports six categories: Length (mm, cm, m, km, in, ft, yd, mi, nautical mile), Weight/Mass (mg, g, kg, metric ton, oz, lb, stone), Temperature (°C, °F, K), Volume (ml, L, m³, tsp, tbsp, fl oz, cup, pint, quart, gallon), Area (mm², cm², m², km², hectare, acre, ft², mi²), and Speed (m/s, km/h, mph, knot, ft/s).
How is temperature conversion different from other units?
Temperature scales use offset formulas rather than simple multiplication. Celsius to Fahrenheit: (°C × 9/5) + 32. Fahrenheit to Celsius: (°F − 32) × 5/9. Celsius to Kelvin: °C + 273.15. The converter handles all these formulas automatically.
Why does the result use scientific notation?
Very large or very small numbers are displayed in scientific notation (e.g., 1.5e+9) to keep the display readable. This happens for extreme conversions like nanometers to light-years or micrograms to metric tons.
How accurate are the conversions?
The converter uses precise conversion factors with up to 10 significant figures. For most practical purposes this is more than sufficient. The results are rounded to eliminate floating-point noise.
About Unit Converter
The Unit Converter provides instant conversion between units across six measurement categories — length, weight, mass, temperature, volume, area, and speed. With over 50 units supported and a quick-reference table showing all conversions simultaneously, it covers the needs of students, engineers, cooks, travelers, and everyday users.
The quick-reference table at the bottom of the converter is a particularly powerful feature. When you enter a value, it shows what that value equals in every other unit in the category, all at once. This is especially useful when you're unsure which unit you need — you can scan the entire list and pick the most appropriate one.
Temperature conversion is handled with special care because temperature scales are offset-based rather than ratio-based. You can't simply multiply by a constant — you need to apply the correct formula. The converter handles Celsius, Fahrenheit, and Kelvin conversions automatically using the precise offset formulas, eliminating a common source of errors.
Volume conversion is particularly valuable for cooking and recipe scaling. Converting between metric (ml, L) and US customary (teaspoon, tablespoon, cup, pint, quart, gallon) units is a daily need for anyone cooking from international recipes. The converter includes all standard cooking volume units alongside scientific and industrial volume measures.