All calculators and tools
146 free tools in 8 categories. Pick a category or scroll the full list.
Math
Percentages, fractions, algebra, geometry and statistics
Percentage CalculatorFind X% of a number, what percent one number is of another, or the whole from a part.Percentage Increase CalculatorFind the percentage increase between two values, or add a percentage to a number.Percentage Decrease CalculatorFind the percentage drop between two values, or take a percentage off a number.Percentage Change CalculatorSigned percentage change from a starting value to a new value, up or down.Percentage Difference CalculatorHow different two values are, as a percentage of their average — order doesn't matter.Percentage Error CalculatorPercentage error between a measured value and the true value, with signed and absolute error.Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, simplified automatically.Fraction to Decimal CalculatorConvert a fraction to a decimal, including the repeating part.Decimal to Fraction CalculatorTurn a decimal — even a repeating one — into an exact fraction in lowest terms.Fraction to Percentage CalculatorConvert a fraction to a percentage and a decimal.Ratio CalculatorSimplify a ratio to lowest terms, or split an amount in a given ratio.Proportion CalculatorSolve for the missing value in direct or inverse proportion (A/B = C/D).Scientific CalculatorType a full expression with brackets, powers, trigonometry, logs and factorials, in degrees or radians.Quadratic Equation SolverSolve ax² + bx + c = 0: discriminant, real or complex roots, vertex and factored form.Linear Equation SolverSolve ax + b = c, or two equations in x and y, with steps and a check.Exponent CalculatorRaise a number to any power, with exact integer results, fractions and scientific notation.Square Root CalculatorFind square, cube or nth roots, with simplified radical form and a perfect-power check.Logarithm CalculatorCalculate log of any base, plus ln, log₁₀ and log₂, or reverse it with an antilog.Pythagorean Theorem CalculatorFind the hypotenuse or a missing leg of a right triangle, plus its area, perimeter and angles.Triangle CalculatorSolve a triangle from three sides, two sides and an angle, or two angles and a side.Circle CalculatorFind the area, circumference, radius and diameter of a circle from any one of them.Area and Volume CalculatorArea, perimeter, volume and surface area for rectangles, trapezoids, cubes, cylinders, cones and spheres.Average CalculatorMean, median, mode, range, sum and count for a list of numbers.Weighted Average CalculatorAverage values that count for different amounts, such as graded assignments.Standard Deviation CalculatorStandard deviation and variance of a list of numbers, sample or population, with the working.Permutation and Combination CalculatornPr and nCr, with and without repetition, calculated exactly for large values.Probability CalculatorSingle events, two events (independent or exclusive) and repeated trials (binomial).HCF and LCM CalculatorHighest common factor (GCD) and lowest common multiple of two or more numbers, with prime factors.Prime Number CheckerCheck whether a number is prime, with its smallest factor and the previous and next primes.Prime Factorization CalculatorBreak a number into prime factors, with exponent form, divisor count and sum of divisors.Divisibility CheckerTest whether a number divides evenly by 2 to 12 or your own divisor, with the rule used.Remainder CalculatorDivide whole numbers to get the quotient and remainder, including how negatives behave.Profit and Loss CalculatorProfit or loss and its percentage from cost and selling price, or find either price.Discount CalculatorSale price after one or two discounts and tax, or the discount percentage from two prices.Speed, Time and Distance CalculatorFind speed, time or distance when you know the other two, in your choice of units.Time and Work CalculatorHow long a job takes when several workers share it, or one worker's missing time.
Image & PDF
Compress, resize, convert and combine images and PDFs, without uploading them
Image CompressorNewCompress JPG, PNG and WebP images in your browser, singly or in batches, without uploading them.Image ResizerNewResize images to exact pixels, a percentage, or centimetres and inches at your DPI.Image ConverterNewConvert images between JPG, PNG and WebP in your browser, one or many at a time.Passport Photo ResizerNewCrop and resize a photo to exact pixels and a KB range for online application forms.Signature ResizerCrop, clean and resize a scanned signature to exact pixels and a KB range for forms.JPG to PDF ConverterCombine JPG, PNG and WebP images into one multi-page PDF, with order, rotation and page size.Merge PDFCombine several PDF files into a single PDF, in the order you choose, in your browser.Split PDFExtract pages, split by range, save each page separately or remove pages from a PDF.PDF CompressorReduce PDF file size by re-compressing pictures or redrawing pages, with an optional KB target.Wi-Fi QR Code GeneratorMake a QR code that connects phones to your Wi-Fi network when scanned, without sharing the password.UPI QR Code GeneratorCreate a UPI payment QR code from your UPI ID, name and optional amount, as PNG or SVG.
Everyday
Dates, ages, time, pace and unit conversions
Age CalculatorExact age in years, months and days from a date of birth, plus the next birthday.Days Between Dates CalculatorNumber of days, weeks, months and years between two dates, with an include-end-date option.Days Until CalculatorCountdown in days to a future date — or days since a past one — from today's date.Date Calculator: Add or Subtract TimeFind the date a set number of years, months, weeks or days before or after a date.Working Days CalculatorCount working days between two dates, or add working days to a date, with your own holidays.Time Duration CalculatorWork out the hours and minutes between two clock times, or add and subtract a duration.Time Zone ConverterConvert a date and time between world time zones, handling daylight saving correctly.Pace CalculatorFind your pace, finish time or distance from the other two, in km or miles, with race times.Unit ConverterOne converter for length, weight, temperature, area, volume, speed, time, data storage and fuel economy.Length ConverterConvert between kilometres, metres, centimetres, miles, yards, feet, inches and more.Weight ConverterConvert between kilograms, grams, pounds, ounces, stones, tonnes, quintals and carats.Temperature ConverterConvert between Celsius, Fahrenheit, Kelvin and Rankine, with absolute-zero checks.Area ConverterConvert square metres, hectares, acres, square feet, square yards, square miles and more.Volume ConverterConvert litres, millilitres, cubic metres, US and imperial gallons, cups, spoons and more.Speed ConverterConvert between km/h, mph, m/s, knots and feet per second.Fuel Economy ConverterConvert km/L, L/100 km, US mpg and UK mpg.Data Storage ConverterConvert bits, bytes, KB, MB, GB, TB and the binary KiB, MiB, GiB and TiB units.
Student
Marks, percentages, CGPA, GPA and attendance
Marks Percentage CalculatorPercentage from marks obtained, marks from a percentage, or an overall percentage across subjects.Weighted Marks and Grade CalculatorOverall course percentage and letter grade from scores with different weights.Required Marks CalculatorThe score you need on the remaining coursework or exam to reach a target overall grade.Exam Score CalculatorNet score from correct and wrong answers using your own marks per question and penalty.CGPA CalculatorCumulative GPA from semester grades, optionally weighted by each semester's credits.CGPA to Percentage CalculatorConvert CGPA to percentage using CBSE's × 9.5 rule, × 10, or your university's own formula.Percentage to CGPA CalculatorConvert a percentage to a 10-point CGPA by reversing the conversion rule you choose.GPA CalculatorSemester GPA from letter grades and credits on the US 4.0 scale, with cumulative GPA.SGPA CalculatorSemester grade point average from grades and credits on a 10-point scale.Attendance Percentage CalculatorAttendance percentage from classes attended and held, checked against a required minimum.Required Attendance CalculatorClasses you must attend to reach your target attendance, or how many you can still miss.
Career
Salary hikes, take-home pay, experience and notice periods
Salary Increment CalculatorNew salary after a percentage increment, with an optional multi-year projection.Salary Hike Percentage CalculatorThe percentage hike between your old and new salary.Salary Comparison CalculatorCompare two job offers by base pay, bonus and other pay, per year and per month.Hourly to Salary CalculatorConvert an hourly rate to weekly, monthly and annual pay, or the reverse.Overtime Pay CalculatorCalculate overtime pay from your monthly salary or hourly rate and a multiplier you choose.CTC to Take-Home Salary Calculator (India)Estimate monthly in-hand salary from annual CTC in India under the new tax regime for FY 2026-27.Experience CalculatorTotal work experience across several jobs, merging overlaps, in years, months and days.Notice Period CalculatorYour last day of notice from the resignation date, in calendar or working days.Leave Balance CalculatorLeave accrued so far and your remaining balance, pro-rata by day or by completed month.
Money
EMI, interest, SIP, FD, RD, GST and inflation
EMI CalculatorMonthly EMI, total interest and total payable for any reducing-balance loan.Amortization Schedule CalculatorFull month-by-month loan schedule, with the interest saved by paying extra each month.Loan Prepayment CalculatorSee the interest and time saved by making a one-time part-payment on a loan.Loan Affordability CalculatorEstimate the loan you can afford from your income, existing EMIs, interest rate and tenure.Loan Interest Rate CalculatorFind the annual interest rate hidden in a loan's monthly payment, amount and tenure.SIP CalculatorProjected value of a monthly investment at an assumed return, with an optional yearly step-up.Lumpsum CalculatorSee what a one-time investment could grow to at a fixed annual return, with an inflation-adjusted value.FD CalculatorMaturity amount and interest on a fixed deposit with quarterly, monthly, yearly or simple interest.RD CalculatorMaturity amount of a recurring deposit with a monthly instalment and compounding.Compound Interest CalculatorGrowth of a lump sum with interest on interest, for any compounding frequency.Simple Interest CalculatorSimple interest and total amount from principal, rate and time in years, months or days.CAGR CalculatorThe steady yearly growth rate between a starting and ending value over a period.GST CalculatorAdd GST to a price or remove it from a GST-inclusive price, with CGST, SGST and IGST split.Inflation CalculatorFuture cost of something today, the purchasing power of money later, or the inflation rate between two prices.
Developer
JSON, text, CSV, hashes, URLs, JWTs, regex and more — all local
JSON FormatterPretty-print JSON with 2 or 4 spaces or tabs and optional key sorting — numbers are never altered.JSON ValidatorCheck whether JSON is valid, with the exact line and column of any error and structure statistics.JSON MinifierRemove all unnecessary whitespace from JSON and see how many bytes you saved.Base64 Encode and DecodeEncode text to Base64 or decode Base64 to text, with URL-safe output and full Unicode support.URL Encode and DecodePercent-encode or decode URLs and query values — as a component, a full URL or form data.HTML Entity Encoder and DecoderEscape text for HTML or decode entities like & and © back to characters.Hash GeneratorGenerate SHA-256, SHA-384, SHA-512 and SHA-1 hashes of any text, in your browser.JWT DecoderRead a JWT's header and payload locally. The signature is not verified.UUID GeneratorGenerate random UUID v4 or time-ordered UUID v7 values in bulk, in your browser.Unix Timestamp ConverterConvert Unix timestamps (seconds or milliseconds) to dates and dates to timestamps, in UTC or local time.Regex TesterTest a regular expression against text with highlighted matches, capture groups and a replace preview.Text Diff CheckerCompare two texts line by line and see exactly what was added and removed.Markdown PreviewerPreview Markdown as you type and copy the HTML it produces, safely, in your browser.HTML FormatterIndent and tidy HTML without changing its tags, attributes or text.CSS FormatterFormat CSS with consistent indentation, or minify it, with errors that give the line number.Slug GeneratorTurn a title into a clean URL slug: lowercase, accents removed, words joined with hyphens.Word CounterCount words, characters, sentences and paragraphs, with reading time and the most-used words.Case ConverterConvert text to UPPER, lower, Title, Sentence, camel, Pascal, snake, kebab and CONSTANT case.Remove Duplicate LinesNewDelete repeated lines from a list and keep one copy of each, in your browser.Sort Lines AlphabeticallyNewSort a list of lines A to Z, Z to A, by number or length, or shuffle them.Find and Replace TextNewFind words or patterns in your text and replace them, with case and regex options.Remove Extra SpacesNewClean pasted text: collapse repeated spaces, trim lines, drop blank lines or join lines.CSV to JSON ConverterConvert CSV or spreadsheet data to JSON, with delimiter detection and type conversion.JSON to CSV ConverterConvert a JSON array of objects to CSV for Excel or Google Sheets, with nested fields flattened.Password GeneratorGenerate strong random passwords with your browser's secure random generator, never sent anywhere.Lorem Ipsum GeneratorGenerate lorem ipsum placeholder text by paragraphs, sentences or words, instantly.URL ParserSplit a URL into scheme, host, port, path, query parameters and fragment.Color ConverterConvert colours between HEX, RGB, HSL and HSV, with WCAG contrast ratios against white and black.Contrast CheckerCheck the contrast ratio of text and background colours against WCAG AA and AAA.Cron Expression ExplainerTranslate a 5-field cron expression into plain English and list its next run times.QR Code GeneratorMake a QR code for a link, text, contact, email, phone or SMS, as PNG or SVG.
Exams
Marks and score calculators for JEE, NEET, GATE, CAT, SSC, banking, UPSC and railway exams
JEE Main Marks CalculatorAdd up your JEE Main Paper 1 score from correct and wrong answers, out of 300.JEE Main Percentile CalculatorApply the NTA percentile definition to your session rank, or turn a percentile back into a rank.JEE Advanced Marks CalculatorScore a JEE Advanced paper with partial marking, using marks per question type that you can edit.NEET UG Marks CalculatorCalculate NEET UG marks from correct and wrong answers: +4, −1, out of 720.NEET Qualifying Cut-off CheckerCheck whether your NEET UG marks or rank meet the qualifying percentile for your category.GATE Marks CalculatorRaw GATE marks from MCQ, MSQ and numerical answers, with the ⅓ and ⅔ negative marking applied.GATE Score CalculatorConvert GATE marks to a score out of 1000 using the official formula and your paper's published figures.CAT Score CalculatorCAT raw score by section from correct and wrong MCQs and correct TITA answers.CAT Percentile CalculatorWork out a percentile from your rank and the number of candidates, or a rank from a percentile.SSC CGL Tier 1 Score CalculatorRaw Tier-I score from correct and wrong answers per section, using the SSC CGL 2025 marking scheme.SSC CHSL Tier 1 Score CalculatorRaw Tier-I score from correct and wrong answers per section, using the SSC CHSL 2025 marking scheme.SSC MTS Score CalculatorSSC MTS raw score out of 270, with negative marking only in Session II.Banking Prelims Score CalculatorTotal and sectional score for a 100-question banking prelim with ¼ negative marking, editable for other exams.UPSC Prelims Score CalculatorUPSC Prelims GS Paper I and CSAT scores with ⅓ negative marking and the 33% CSAT check.RRB NTPC and Group D Score CalculatorRaw CBT score for RRB NTPC (CBT-1, CBT-2) and Group D with ⅓ negative marking.Target Score PlannerFind how many answers you must get right to reach a target score, given negative marking.Mock Test TrackerTrack mock-test scores, averages and trend. Your list is saved only in this browser.