World of General Tools
Quick tools you need every day — from calculating any percentage to converting your clothing and shoe sizes when shopping internationally.
Percentage Calculator
Calculate any percentage operation: X% of a number, what percent X is of Y, percentage change between two values, or the result of increasing/decreasing a value by a percentage.
Clothing & Shoe Size Converter
Convert your shoe or clothing size between international systems (US, UK, EU, cm) for men and women, with foot length in centimeters for the most accurate result when shopping from foreign stores.
Ideal Screen Size Calculator (by Viewing Distance)
Calculate the ideal TV or monitor size in inches based on your actual viewing distance, using the THX and SMPTE viewing angle standards.
Coming soon to this world
Comprehensive unit conversion calculator, password generator — we're working on adding them soon.
Comprehensive guides for this world
Frequently asked questions about this world
Are the calculators in this section tied to one specific domain?
No, these are general-purpose math and conversion tools (percentage, size/unit conversion, screen size) usable in any context — business, study, or daily life — not tied to a single domain.