Percentage Calculator
Three calculators: percent of a number, what percent one number is, and change.
Timers, counters, converters and calculators for everyday jobs, plus tools for text, images and code. Every one works in your own browser, needs no sign-up, and shows how it got the answer.
The eight people open most, and the working is shown on every one.
Three calculators: percent of a number, what percent one number is, and change.
Calculate monthly payments and total interest for any fixed-rate loan.
Work out BMI from height and weight, in metric or imperial units.
EMI, total interest and the full repayment schedule for a loan of any size.
Enter a date of birth to get an exact age plus total months, weeks and days.
See how an investment grows with compounding and monthly contributions.
Enter a price and a discount to get the saving, the final price and tax.
Calculate weighted GPA from your grades and credit hours.
330 tools, grouped by the job they do. Every category has its own page with the full list and a short guide to which tool to pick.
Timers, counters, pickers and the small tools you reach for daily.
14 toolsLoans, mortgages, interest, savings and investment returns.
38 toolsPricing, margin, tax, payroll and advertising spend.
19 toolsPercentages, fractions, roots, powers, sequences and equations.
25 toolsAverages, spread, z-scores, confidence intervals and sample sizes.
13 toolsArea, perimeter, volume, surface area and triangle solving.
16 toolsBMI, BMR, calories, body fat, heart rate and pace.
19 toolsDays between dates, working days, durations and timesheets.
13 toolsLength, weight, temperature, volume, speed, energy and data.
18 toolsTiles, paint, concrete, running costs and energy bills.
17 toolsGrades, GPA, weighted averages and attendance.
8 toolsSubnets, bytes, bitrates, pixels and screen maths.
11 toolsCount, clean, convert and reorder any block of text.
13 toolsFormat JSON, inspect URLs and work with timestamps.
25 toolsCompress and resize pictures without uploading them.
14 toolsPick colours and convert between HEX, RGB and HSL.
6 toolsBase64, URL and HTML encoding in both directions.
8 toolsPasswords, QR codes and other everyday helpers.
9 toolsLinks, meta tags, schema markup, redirects and SERP previews.
34 toolsTidy or shrink HTML, CSS, JavaScript, XML, SQL and Markdown.
10 tools133 other tools live here too: counting and cleaning text, resizing and converting images, formatting JSON and CSS, and the SEO utilities. Browse the full directory.
Live word, character, sentence and paragraph counts with a reading-time estimate.
Resize images by pixels or percentage, with aspect ratio locking.
Generate a QR code for any link or text and download it as a PNG or SVG.
Pretty-print and validate JSON, with the exact line and column of any error.
Generate strong random passwords with your own length and character rules.
Compress and resize JPEG, PNG and WebP images privately in your browser.
Convert any text to UPPERCASE, lowercase, Title Case, Sentence case and more.
Choose any colour and copy it in HEX, RGB or HSL, with tints and shades.
Four things we hold to on every tool we build.
No subscriptions or complicated signups. Open a tool and use it.
Most tools work instantly in your browser, with no upload step to wait for.
Many tools process your data locally, so what you paste stays on your device.
Simple interfaces designed for everyone, not just developers.
Three steps, start to finish.
More detail on the full FAQ page.
Yes. Every tool on the site is free to use with no account, no sign-up and no trial period. There is nothing to install and no usage quota.
For the great majority of tools, no. Text, JSON, colours, calculations and images are all processed by JavaScript running inside your own browser tab, so the data never leaves your device.
No. Open a tool and use it. We do not ask for an email address and there is nothing to sign in to.
Yes. The whole site is built mobile-first, and every tool interface adapts to small screens so the controls and results stay usable.
Yes. You are free to use the results in personal, academic and commercial projects. The output belongs to you.
Send the idea through the contact page. Requests that solve a common, well-defined problem and can run in the browser are the ones most likely to be built.
Every tool in one place, with search and category filters so you can find the right one in seconds.