Tools

Practical tools and converters for everyday use.

Convert between Arabic numbers and Roman numerals. Supports bi-directional conversion for numbers between 1-3999.

Choose whether you need the value of a percentage or the percentage of a value, then get the exact number instantly.

Quickly convert temperatures between Celsius, Fahrenheit, and Kelvin while seeing all three scales at once.

Convert between watts, kilowatts, megawatts, horsepower, BTU/h, tons of refrigeration, dBm, and dBW with one input.