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Converting, calculating, generating, checking, visualizing — 216 tools, no signup, no ads, nothing sent to a server.
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Random tool →Supply & demand Drag the curves. Watch equilibrium, surplus, taxes and price controls respond in real time. VisualizersTablespoons to teaspoons Convert tablespoons to teaspoons, with the formula and a quick reference table. ConvertersLoan calculator Monthly payment, total interest and a full amortization schedule you can export. FinanceWord & character counter Words, characters, sentences, reading time and social-media limits, live. TextPercentage calculator X% of Y, percent change, reverse percentage and percentage points — all on one page. MathDate difference Days, weeks, months and years between two dates — with or without weekends. Date & timeJSON formatter & validator Pretty-print, minify and validate JSON with the error located for you. DeveloperCups to grams by ingredient A cup of flour and a cup of sugar are not the same weight. This one knows the difference. CookingBMI calculator Body mass index in metric or imperial, with an honest note on its limits. Health & fitnessContrast checker WCAG 2.2 contrast ratio with pass/fail for every text size, and a suggested fix. Color & designWheel spinner A spinning wheel of your own options — with elimination mode for classrooms. Random & decideImage resizer Resize by pixels or percentage, in your browser. The file never leaves your device. Images
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Converters Every unit, every pair — length, weight, volume, temperature, data and more. 91 Cooking Cups to grams by ingredient, recipe scaling, oven temperatures and baker’s math. 7 Math Calculators that show their work — algebra, geometry, fractions and percentages. 11 Statistics Descriptive stats, distributions, regression and significance testing. 6 Finance Loans, mortgages, compounding, salary, inflation and everyday money math. 13 Health & fitness Body metrics, training paces and everyday wellness math. 11 Date & time Date arithmetic, time zones, timers and timestamp conversion. 12 Text Counting, cleaning, comparing, encoding and generating text. 13 Developer JSON, encoding, hashing, regex, networking and other daily dev utilities. 17 Color & design Convert colors, build palettes and check contrast against WCAG. 6 Images Resize, convert and compress — entirely in your browser. 5 Random & decide Pickers, spinners, dice and generators for when you need chance on tap. 8 School Grades, GPA, citations and printables for students and teachers. 6 Visualizers Drag the curves. Interactive models for economics, math and computer science. 5 Reference Charts and tables worth bookmarking — or printing. 5
It never leaves your device
Text, numbers, images — everything is processed in your browser. There is no upload step because there is nowhere to upload to.
Every result is a link
Inputs live in the URL, so any answer can be bookmarked, shared, or dropped into a lesson plan exactly as you left it.
It shows the work
Each tool states the formula it used and cites where the formula comes from. Converters are round-trip tested against NIST factors on every build.