Free online tools that just work
Free online tools that just work
Fast, accurate and free. No sign-up, no clutter.
Finance & Money Loans, mortgages, savings, investing and everyday money math. 93 tools 
Health & Everyday BMI, calories, pace, sleep and other daily calculators. 27 tools 
Sports & Fitness Race predictions, training paces, scoring and match simulators. 48 tools 
Conversion & Engineering Unit conversion, electronics and mechanics. 32 tools 
Images Convert, resize, compress and analyze images in your browser. 31 tools 
Time & Date Time zones, date math, countdowns and calendars. 17 tools 
Random & Generators Passwords, dice, wheels, picks and other randomness. 12 tools 
Games & Puzzles Crosswords, word searches, sudoku, mazes and printable puzzles. 36 tools 
Education & Learning Grade calculators, memory simulators, study trainers and printable worksheets. 14 tools 
Math Calculators Algebra, calculus, geometry, matrices and number theory. 46 tools 
Simulations & Math Toys Epidemics, traffic, cellular automata, fractals and animated math. 162 tools 
Arts & Crafts Cross-stitch charts, papercraft box templates and printable graph paper. 5 tools 
Planning & Organizing Seating charts, gift exchanges, tournaments, schedules, matching and voting. 13 tools 
Text & Writing Word counts, diffs, case tools and text clean-up. 19 tools 
Science Chemistry, physics, biology and astronomy calculators. 51 tools 
Machine Learning & AI Neural nets, clustering, gradient descent and reinforcement learning — trained live in your browser. 50 tools 
Data & Files CSV, JSON, spreadsheets and file format tooling. 28 tools 
Developer Formatters, encoders, regex, hashes and dev utilities. 52 tools 
Audio & Video Convert, trim and inspect audio and video files. 20 tools 
Statistics Distributions, hypothesis tests, regression and probability. 57 tools 
SEO & Web Meta tags, SERP previews, redirects and page analysis. 8 tools 
Gambling Odds, expected value, house edge and bankroll math. 31 tools 
Cryptography Encryption, signatures, tokens and classic ciphers. 20 tools