⌘11 FREE TOOLS
Computing calculators
Digital technology and engineering math. All calculations happen locally in your browser.
Browse 11 calculators
Number Base ConverterConvert integers between binary, octal, decimal, hexadecimal and bases 2–36.↗
HEX / RGB Color ConverterConvert HEX colors to RGB and HSL with a live color swatch.↗
Download Time CalculatorEstimate time to download a file at a constant network rate.↗
Data Storage CalculatorConvert between decimal kilobytes, megabytes and gigabytes.↗
PPI CalculatorCalculate display pixel density from resolution and diagonal.↗
Aspect Ratio CalculatorFind width-to-height ratio and resize proportionally.↗
Electricity Cost CalculatorCalculate electricity expense from appliance wattage and usage.↗
Series Resistors CalculatorFind equivalent resistance for three series resistors.↗
Parallel Resistors CalculatorFind equivalent resistance for three parallel resistors.↗
Frequency to WavelengthConvert electromagnetic wave frequency to wavelength in vacuum.↗
Compression Ratio CalculatorCalculate file compression ratio and size reduction.↗