All tools

Calculate body mass index with indicative adult category classification.

Interactive calendar with holidays of the world, lunar phases, memorable events. Displays holidays on the calendar.

Convert between currencies available in the downloaded exchange-rate dataset.

Calculate the exact difference between two calendar dates in days, weeks, and hours.

A local environment for 16-bit FASM programs: compile with real FASM, run in DOSBox, and debug step by step through Debug/X.

A local ambient sound studio for focus, relaxation, and sleep. Mix 20 real recordings, tune a separate binaural beat, and start a session.

Convert between metres, centimetres, kilometres, yards, feet, and inches.

Online MP3 metadata editor. Edit title, artist, album, cover art, lyrics and other tags. Batch editing of multiple files.

Password generator using cryptographically secure randomness in modern browsers. Customize length, quantity, and character groups.

Calculate a percentage of a number, one number as a percentage of another, and percentage change.

Design a high-frequency transformer for push-pull, half-bridge and full-bridge converters with turns, currents, wire sizing, core loss, window fill, up to five outputs and output chokes.

Powerful random number generator: integer/fractional values, customizable ranges. Features: exclude duplicates, sort.

Solve a Boolean function from a formula, value vector, or editable truth table with every transformation shown.

Count words, letters, characters, and sentences in text. Works with Unicode alphabets.

A tool for memorizing poems and texts. Gradual word hiding for memory training.

Convert durations between units from nanoseconds to millennia.

Build Euler–Venn diagrams for 2–4 sets using formulas or actual elements, with membership tables and export.

Convert between kilograms, grams, tonnes, ounces, and pounds.