Every small calculation, in one quiet place.
59 tools for money, study, health, dates, text and code. They run entirely in your browser, work on a phone, and cost nothing.
59 tools
Money & business
Loans, savings, pricing and pay — worked out precisely.Loan & EMI calculatorMonthly payment, total interest and a year-by-year payoff schedule.Mortgage calculatorFull monthly housing cost including tax, insurance and association fees.Compound interest calculatorGrow a starting balance with regular deposits and see the split at the end.Discount & sales tax calculatorSale price after a percentage off, with tax applied on top.Tip calculator & bill splitTip amount, total, and what each person owes.Salary & hourly rate converterMove between hourly, weekly, monthly and annual pay.VAT & GST calculatorAdd tax to a net figure, or pull the tax back out of a gross one.
Health & body
General estimates using standard clinical formulas.Students & study
Grades, GPA and admission merit, worked out with your own weightings.GPA calculatorSemester GPA from your course credits and grades, on a 4.0, 5.0 or 10.0 scale.CGPA calculatorCombine every semester into a cumulative GPA, then see what you need next term.Admission aggregate calculatorMerit aggregate from matric, intermediate and entry-test marks, with university presets.Weighted grade calculatorWork out your standing in a course when quizzes, assignments and exams carry different weights.Final grade calculatorThe marks you need on the final to finish the course on the grade you want.Attendance calculatorYour attendance percentage, how many classes you can still miss, and how many you must attend to recover.Marks percentage calculatorTotal your subject marks into one percentage, with grade and division for each paper.CGPA to percentage converterConvert CGPA or GPA to a percentage and back, using your own university's formula.Typing speed testMeasure your words per minute and accuracy on a one-minute test.Pomodoro study timerTwenty-five minutes of work, five of rest, counted for you with a longer break every fourth round.
Maths & statistics
Calculators that show the method, not just the answer.Scientific calculatorTrigonometry, logarithms, powers, roots and factorials, with a running history.Mean, median, mode & standard deviationPaste a list of numbers and get every summary statistic at once.Fraction calculatorAdd, subtract, multiply and divide fractions, simplified and shown as a decimal.Quadratic equation solverRoots, discriminant, vertex and factored form for ax² + bx + c = 0 — type coefficients or the whole equation.LCM & HCF calculatorLowest common multiple and highest common factor of any list of numbers, with prime factors.
Dates & time
Ages, gaps and deadlines, counted correctly.Converters
Units, numbers and notation, converted both ways.Unit converterLength, weight, volume, area, speed, temperature, data and more.Number to wordsWrite a figure out in English — useful for cheques and contracts.Roman numeral converterNumbers to Roman numerals and back, up to 3,999,999.Number base converterBinary, octal, decimal and hexadecimal side by side.Random number generatorDraw numbers in a range, with or without repeats.
Text & writing
Counting, cleaning and reshaping written text.Word & character counterLive counts, reading time and the words you lean on most.Case converterSentence case, title case, camelCase, snake_case and more, in one click.Lorem ipsum generatorPlaceholder copy in paragraphs, sentences or an exact word count.URL slug generatorTurn a headline into a clean, search-friendly URL path.Duplicate remover & line sorterDeduplicate, sort, trim and renumber a list of lines.
Web & developer
Everyday utilities for building and debugging.JSON formatter & validatorPretty-print, minify and find the exact spot an error starts.Base64 encoder & decoderConvert text to Base64 and back, with full Unicode support.URL encoder & decoderPercent-encode query strings, or read an encoded link back.Hash generatorSHA-1, SHA-256, SHA-384 and SHA-512 checksums of any text.Password generatorStrong random passwords made in your browser, never transmitted.UUID generatorVersion 4 identifiers in bulk, ready to paste into code or a database.QR code generatorMake a QR code for a link, wifi network or message, and save it as a PNG.Colour converter & paletteHEX, RGB and HSL together, with tints, shades and a contrast check.
Images & files
Resize, compress and encode — without an upload.Image resizer & compressorShrink a photo to the exact size you need. The file never leaves your device.Image to Base64Turn a picture into a data URI you can paste straight into CSS or HTML.Image format converterConvert JPG, PNG, WebP, GIF, BMP and SVG to PNG, JPG or WebP — batch, in your browser.JPG to PNG converterConvert JPG or JPEG photos to PNG, with a transparent background preserved where it exists.PNG to JPG converterConvert PNG images to JPG. Transparent areas are filled white, and the file gets smaller.WebP to JPG converterConvert WebP images to JPG for the apps and sites that still don't open WebP.WebP to PNG converterConvert WebP images to PNG, keeping any transparency intact.PNG to WebP converterConvert PNG images to WebP for a noticeably smaller file at the same quality.JPG to WebP converterConvert JPG images to WebP for smaller files with barely any visible difference.SVG to PNG converterRasterise an SVG icon or illustration to PNG at the exact pixel size you need.HEIC to JPG converterConvert iPhone HEIC photos to ordinary JPG that opens anywhere.Image to PDF converterCombine one or more photos into a single PDF, one page per image.PDF to JPG converterTurn every page of a PDF into a separate JPG or PNG image.Favicon & ICO generatorTurn a square logo into a multi-size .ico favicon, plus individual PNGs for every device.
What this site is
ledger365 is a collection of the calculations people look up most often — loan repayments, grade point averages, admission aggregates, unit conversions, word counts, formatted JSON — gathered in one place and built to load fast and answer in one screen.
Every tool runs as JavaScript in your own browser. There is no account to create, no upload step, and nothing you type is transmitted or stored. That matters most for the tools handling private material: the image resizer never sends your photo anywhere, the password generator produces passwords that exist only in your tab, and the JSON formatter is safe for payloads you would not paste into someone else's server.