Sources
Every figure that isn't plain arithmetic comes from a public source, checked before it is used. Here is the full list, tool by tool.
How we choose our sources
We favor official bodies (WHO, FAO, USDA, NIST, BIPM, Bank of Canada), scientific publications and, for building materials, manufacturers' data sheets. A figure we could not read at its source is not used: the tool waits.
Unit converters
BMI calculator
BMR calculator
Calorie calculator
Cups to grams converter
Concrete calculator
Paint calculator
HEX, RGB, HSL color converter and contrast checker
Download time calculator
Secure password generator
Currency converter
Last updated: November 5, 2026