All Tools
Browse all 153 CalcKitt calculators and tools.
Percentage Calculator
Calculate a percentage of a number, find what percentage one value is of another, or find a number from a percentage.
Calculators →Compound Interest Calculator
Estimate how an initial balance grows when interest is compounded over time.
Calculators →Simple Interest Calculator
Calculate simple interest and the final amount without compounding.
Calculators →Loan Calculator
Estimate a fixed monthly loan payment and total interest.
Calculators →Mortgage Calculator
Estimate monthly principal and interest for a fixed-rate home loan.
Calculators →Investment Calculator
Estimate future investment value with regular monthly contributions.
Calculators →Savings Calculator
Estimate how savings can grow with regular deposits and interest.
Calculators →ROI Calculator
Calculate return on investment from cost and ending value.
Calculators →Profit Margin Calculator
Calculate profit, margin percentage, and markup from revenue and cost.
Calculators →Discount Calculator
Find the sale price and savings after a percentage discount.
Calculators →Sales Tax Calculator
Calculate sales tax and the total price after tax.
Calculators →Salary Calculator
Convert an annual salary into monthly, weekly, daily, and hourly estimates.
Calculators →Tip Calculator
Calculate a tip, total bill, and per-person amount.
Calculators →Inflation Calculator
Measure the percentage increase or decrease between two price levels.
Calculators →APR Calculator
Estimate a simple annual percentage rate from borrowing costs.
Calculators →APY Calculator
Convert a nominal annual rate and compounding frequency into annual percentage yield.
Calculators →Break-Even Calculator
Estimate how many units must be sold to cover fixed and variable costs.
Calculators →Markup Calculator
Calculate markup percentage and gross profit from cost and selling price.
Calculators →Unit Price Calculator
Find the price per item, weight unit, or other quantity.
Calculators →Commission Calculator
Calculate commission earnings from sales and a commission rate.
Calculators →Depreciation Calculator
Calculate straight-line annual depreciation and book value after a number of years.
Calculators →Future Value Calculator
Estimate the future value of a lump sum at a fixed annual return.
Calculators →Present Value Calculator
Discount a future amount back to its estimated value today.
Calculators →Debt-to-Income Calculator
Calculate a debt-to-income ratio from monthly debt payments and gross monthly income.
Calculators →Credit Card Payoff Calculator
Estimate how long it may take to pay off a credit card with a fixed monthly payment.
Calculators →Auto Loan Calculator
Estimate a fixed monthly auto-loan payment and total interest.
Calculators →Hourly to Salary Calculator
Convert an hourly wage into weekly, monthly, and annual earnings.
Calculators →Salary to Hourly Calculator
Convert an annual salary into an estimated hourly rate.
Calculators →Interest Rate Calculator
Estimate an annualized growth rate from a beginning value, ending value, and time period.
Calculators →Loan Payoff Calculator
Estimate payoff time for a balance with a fixed monthly payment.
Calculators →Fraction Calculator
Add, subtract, multiply, or divide two fractions and simplify the result.
Calculators →Ratio Calculator
Simplify a two-number ratio to its lowest whole-number form.
Calculators →Average Calculator
Calculate the arithmetic mean of a list of numbers.
Calculators →Exponent Calculator
Calculate a base raised to an exponent.
Calculators →Square Root Calculator
Calculate the principal square root of a non-negative number.
Calculators →Probability Calculator
Calculate simple probability from favorable outcomes and total outcomes.
Calculators →Area Calculator
Calculate the area of common 2D shapes.
Calculators →Volume Calculator
Calculate the volume of common 3D shapes.
Calculators →Scientific Calculator
Use a compact scientific calculator for arithmetic, powers, roots, logarithms, and trigonometry.
Calculators →GCD Calculator
Find the greatest common divisor of two integers.
Calculators →LCM Calculator
Find the least common multiple of two integers.
Calculators →Percentage Change Calculator
Calculate percentage increase or decrease from an old value to a new value.
Calculators →Quadratic Formula Calculator
Solve a quadratic equation in the form ax² + bx + c = 0.
Calculators →Pythagorean Calculator
Find the hypotenuse of a right triangle from its two legs.
Calculators →Standard Deviation Calculator
Calculate population and sample standard deviation for a list of numbers.
Calculators →Median Calculator
Find the median of a list of numbers.
Calculators →Mode Calculator
Find the most frequently occurring value or values in a list.
Calculators →Prime Number Calculator
Check whether a whole number is prime.
Calculators →Factorial Calculator
Calculate n! for a non-negative integer.
Calculators →Permutation & Combination Calculator
Calculate permutations and combinations for n items taken r at a time.
Calculators →Slope Calculator
Calculate the slope between two points on a coordinate plane.
Calculators →Distance Calculator
Calculate the straight-line distance between two 2D points.
Calculators →Midpoint Calculator
Find the midpoint between two 2D coordinate points.
Calculators →Circle Calculator
Calculate circumference and area from a circle's radius.
Calculators →Triangle Calculator
Calculate triangle area and perimeter from base, height, and side lengths.
Calculators →Surface Area Calculator
Calculate surface area for common 3D solids.
Calculators →Decimal to Fraction Calculator
Convert a decimal into a simplified fraction.
Calculators →Fraction to Decimal Calculator
Convert a fraction into a decimal value.
Calculators →Weighted Average Calculator
Calculate a weighted average from paired values and weights.
Calculators →Age Calculator
Calculate exact age from a birth date to a selected date.
Calculators →Date Difference Calculator
Find the number of days and approximate calendar span between two dates.
Calculators →Date Add/Subtract Calculator
Add or subtract days, weeks, months, or years from a date.
Calculators →Time Duration Calculator
Calculate elapsed time between two times on the same or next day.
Calculators →Countdown Calculator
Run a live countdown to a future date and time.
Calculators →Fuel Cost Calculator
Estimate trip fuel use and fuel cost from distance and fuel economy.
Calculators →Electricity Cost Calculator
Estimate electricity use and cost from appliance power and usage time.
Calculators →Speed Calculator
Calculate average speed from distance and travel time.
Calculators →Pace Calculator
Calculate average pace per mile from distance and total time.
Calculators →GPA Calculator
Calculate a weighted GPA from grade points and course credits.
Calculators →Grade Calculator
Calculate a weighted course grade from scores and weights.
Calculators →BMI Calculator
Calculate body mass index from weight and height.
Calculators →Calorie Calculator
Estimate daily calorie needs from the Mifflin-St Jeor equation and activity level.
Calculators →BMR Calculator
Estimate basal metabolic rate using the Mifflin-St Jeor equation.
Calculators →Body Fat Calculator
Estimate adult body fat percentage using the U.S. Navy circumference method.
Calculators →Ideal Weight Calculator
Estimate reference adult body weight from height using several common formulas.
Calculators →Water Intake Calculator
Estimate a simple daily water target from body weight.
Calculators →Concrete Calculator
Estimate concrete volume for a rectangular slab and convert it to cubic yards.
Calculators →Paint Calculator
Estimate paint quantity from wall area and paint coverage.
Calculators →Tile Calculator
Estimate the number of tiles needed for an area, including waste.
Calculators →Square Footage Calculator
Calculate rectangular floor or wall area in square feet.
Calculators →Currency Converter
Convert between major currencies using live exchange-rate data when available.
Converters →Length Converter
Convert common length and distance units.
Converters →Weight Converter
Convert common weight and mass units.
Converters →Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin temperatures.
Converters →Area Converter
Convert common area units.
Converters →Volume Converter
Convert common volume units.
Converters →Speed Converter
Convert common speed units.
Converters →Time Converter
Convert seconds, minutes, hours, days, and weeks.
Converters →Data Storage Converter
Convert bytes and common digital storage units.
Converters →Pressure Converter
Convert common pressure units.
Converters →Energy Converter
Convert common energy units.
Converters →Power Converter
Convert watts, kilowatts, horsepower, and other power units.
Converters →Frequency Converter
Convert hertz and common frequency multiples.
Converters →Angle Converter
Convert degrees, radians, gradians, and turns.
Converters →Fuel Economy Converter
Convert miles per gallon and liters per 100 kilometers.
Converters →Password Generator
Generate a random password with selectable length and character types.
Generators →QR Code Generator
Generate a QR code from text or a URL.
Generators →Random Number Generator
Generate a random integer within a selected range.
Generators →Random Name Generator
Generate a random sample name for testing, examples, and creative prompts.
Generators →Username Generator
Generate username ideas from optional words and random modifiers.
Generators →UUID Generator
Generate RFC 4122 version 4 UUID-style identifiers.
Generators →Lorem Ipsum Generator
Generate placeholder paragraphs for layouts and prototypes.
Generators →Color Palette Generator
Generate a random five-color palette with reusable HEX values.
Generators →Strong Password Generator
Generate a longer high-entropy password using upper/lowercase letters, numbers, and symbols.
Generators →Word Counter
Count words, characters, sentences, paragraphs, and estimated reading time.
Text Tools →Character Counter
Count characters with and without spaces.
Text Tools →Sentence Counter
Estimate the number of sentences in a block of text.
Text Tools →Reading Time Calculator
Estimate reading time from word count.
Text Tools →Case Converter
Convert text to upper case, lower case, title case, or sentence case.
Text Tools →Remove Duplicate Lines
Remove repeated lines while preserving the first occurrence.
Text Tools →Text Sorter
Sort lines alphabetically, reverse alphabetically, or by length.
Text Tools →Text Reverser
Reverse characters, words, or line order.
Text Tools →Text Cleaner
Clean extra whitespace and blank lines from pasted text.
Text Tools →Find & Replace
Find text and replace every matching occurrence.
Text Tools →Slug Generator
Convert a title or phrase into a clean URL slug.
Text Tools →Image Compressor
Reduce image file size by re-encoding JPEG or WebP quality in your browser.
Image Tools →Image Resizer
Resize an image to a new width and height in your browser.
Image Tools →Image Cropper
Crop an image using numeric crop coordinates and dimensions.
Image Tools →Image Converter
Convert an image to PNG, JPEG, or WebP.
Image Tools →JPG to PNG
Convert a JPG or JPEG image to PNG.
Image Tools →PNG to JPG
Convert a PNG image to JPEG.
Image Tools →WebP Converter
Convert an image to or from WebP using browser-supported formats.
Image Tools →Image to Base64
Convert an image file into a Base64 data URL.
Image Tools →Base64 to Image
Preview and save an image from a Base64 data URL.
Image Tools →Image Color Picker
Pick a pixel color from an uploaded image.
Image Tools →PDF Compressor
Create a smaller rasterized PDF by reducing page image quality and resolution.
PDF Tools →PDF Merger
Combine multiple PDF files into one document in your browser.
PDF Tools →PDF Splitter
Extract a page range from a PDF into a new PDF.
PDF Tools →PDF to JPG
Render a PDF page as a JPG image.
PDF Tools →JPG to PDF
Combine JPG or PNG images into a PDF.
PDF Tools →PDF to PNG
Render a PDF page as a PNG image.
PDF Tools →Rotate PDF
Rotate every page in a PDF by 90, 180, or 270 degrees.
PDF Tools →Extract PDF Pages
Extract selected pages from a PDF into a new file.
PDF Tools →JSON Formatter
Format and minify JSON with syntax validation.
Developer Tools →JSON Validator
Validate JSON and report parsing errors.
Developer Tools →Base64 Encoder
Encode UTF-8 text as Base64.
Developer Tools →Base64 Decoder
Decode Base64 into UTF-8 text.
Developer Tools →URL Encoder
Percent-encode text for use in a URL component.
Developer Tools →URL Decoder
Decode percent-encoded URL text.
Developer Tools →HTML Encoder
Escape HTML-sensitive characters for safe display as text.
Developer Tools →HTML Decoder
Decode common HTML entities back into text.
Developer Tools →Timestamp Converter
Convert Unix timestamps and date-time values.
Developer Tools →Regex Tester
Test a JavaScript regular expression against text.
Developer Tools →Hash Generator
Generate SHA-256, SHA-384, or SHA-512 hashes from text.
Developer Tools →JWT Decoder
Decode JWT header and payload sections without verifying the signature.
Developer Tools →Color Converter
Convert HEX colors to RGB and HSL values.
Developer Tools →HEX to RGB
Convert a HEX color to RGB.
Color Tools →RGB to HEX
Convert RGB channel values to a HEX color.
Color Tools →HEX to HSL
Convert a HEX color to HSL.
Color Tools →Color Picker
Pick a color and inspect its HEX and RGB values.
Color Tools →Color Contrast Checker
Calculate WCAG contrast ratio between two colors.
Color Tools →Gradient Generator
Build a CSS linear gradient from two colors and an angle.
Color Tools →Color Palette Generator
Generate a random five-color palette.
Color Tools →