Convert everyday units for length, weight, temperature, area, volume and speed.
Choose a category, enter a value, and select the units to convert between. The answer updates instantly, so it is useful for recipes, travel, fitness and quick work checks.
Temperature conversions use their exact formulas; other categories convert through a shared base unit to keep results consistent.
The converter is useful for quick checks such as centimeters to inches, kilograms to pounds, liters to cups and kilometers per hour to miles per hour. For recipes, remember that volume and weight are different measurements: one cup of flour and one cup of water do not weigh the same.
Most unit categories multiply through a base unit, but temperature uses offset formulas. Celsius, Fahrenheit and Kelvin do not share the same zero point, so they are handled separately to avoid the common mistake of treating temperature like a simple ratio.
Displayed values are rounded so they stay readable on mobile screens. If you are checking engineering, lab or legal specifications, use the result as a quick reference and confirm required precision with the official standard or source document.
Length, weight, temperature, area, volume and speed are included.
Metric conversions are exact where the standard defines them. Displayed numbers are rounded for readability.
No. All conversion math runs locally in your browser.
Not directly, because cups measure volume and grams measure weight. The correct conversion depends on the ingredient density.
Temperature units have offsets as well as scale differences. For example, 0 Celsius is 32 Fahrenheit, so the calculator uses a formula instead of only multiplying.
Use it as a fast reference. For contracts, laboratory work, engineering tolerances or legal documents, confirm the required precision with the official standard.