Every tool you need to calculate, convert
and create, in one place
All 264 tools are 100% FREE and easy to use! Calculate, convert, edit PDFs and images with just a few clicks — everything runs privately in your browser.
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Most used tools
Mortgage Calculator
See your monthly payment, total interest, and PMI risk for any home loan.
Finance & MoneyLoan Calculator
Monthly payment, total interest, and total cost for any fixed-rate loan.
Health & FitnessBMI Calculator
Body mass index, WHO category, and your healthy weight range.
Math & EducationPercentage Calculator
Percent of a number, percent one number is of another, and percent change.
Developer ToolsJSON Formatter & Validator
Format, validate, and minify JSON with precise error messages.
Text ToolsWord Counter
Words, characters, sentences, paragraphs, and reading time — live.
PDF ToolsMerge PDF
Combine several PDF files into one, in any order.
Image ToolsImage Compressor
Shrink image file size with a live quality preview.
SEO & WebQR Code Generator
Create custom QR codes for URLs, text, or contact details.
Unit ConvertersUnit Converter
Convert length, weight, temperature, area, volume, speed, and data units.
Developer ToolsPassword Generator
Strong random passwords from a cryptographic source — never sent anywhere.
Finance & MoneyCompound Interest Calculator
Project how savings grow with compounding and regular contributions.
Mortgage Calculator
See your monthly payment, total interest, and PMI risk for any home loan.
Loan Calculator
Monthly payment, total interest, and total cost for any fixed-rate loan.
Auto Loan Calculator
Car payment including sales tax, trade-in value, and dealer fees.
Compound Interest Calculator
Project how savings grow with compounding and regular contributions.
Simple Interest Calculator
I = P × R × T, computed instantly with the total repayment amount.
Savings Calculator
How your balance grows with monthly deposits at a given APY.
ROI Calculator
Return on investment as a percentage, plus annualized ROI.
Inflation Calculator
What today's money will cost — and buy — years from now.
Credit Card Payoff Calculator
How long to clear a card balance — and the interest it will cost.
Salary Calculator
Convert pay between hourly, weekly, monthly, and annual instantly.
Hourly to Salary Calculator
Your annual salary from an hourly wage in one step.
Tip Calculator
Tip amount, total bill, and per-person split in one tap.
Debt-to-Income (DTI) Calculator
Front-end and back-end DTI — the ratios lenders actually check.
Down Payment Calculator
Down payment amount, resulting loan size, and your LTV at a glance.
Sales Tax Calculator
Add tax to a price — or extract the pre-tax price from a total.
Refinance Calculator
Should you refinance? See the new payment, savings, and break-even point.
Amortization Calculator
Monthly payment plus how each year splits between principal and interest.
401(k) Calculator
Project your 401(k) balance, including the full employer match.
Retirement Calculator
Will your savings last? Projected nest egg and the income it supports.
Roth IRA Calculator
Project tax-free Roth IRA growth to retirement.
Investment Calculator
Future value of a lump sum plus regular contributions.
Debt Snowball Calculator
A payoff plan and debt-free date, snowball or avalanche.
Car Lease Calculator
Monthly lease payment from price, residual, and money factor.
Budget Calculator (50/30/20)
Split your income into needs, wants, and savings with the 50/30/20 rule.
Car Payment Calculator
Find the vehicle price a target monthly payment can afford.
APR Calculator
Find the true APR of a loan once fees are included.
Discount Calculator
Final sale price and savings, including stacked discounts.
Net Worth Calculator
Add up assets and subtract liabilities to find your net worth.
Mortgage Payoff Calculator
See how extra payments cut years and interest off your mortgage.
CD Calculator
Maturity value and APY for a certificate of deposit.
Future Value Calculator
What a sum today will grow to at a given rate.
Present Value Calculator
What a future sum is worth in today's money.
Annuity Calculator
Present and future value of a stream of regular payments.
Break-Even Calculator
Units and revenue needed to cover your costs.
Profit Margin Calculator
Profit margin and markup from cost and selling price.
Markup Calculator
Selling price and profit from cost and markup percentage.
Commission Calculator
Total pay from a commission rate, sales, and base salary.
Overtime Pay Calculator
Total pay including overtime at a chosen multiplier.
BMI Calculator
Body mass index, WHO category, and your healthy weight range.
BMR Calculator
Calories your body burns at complete rest (Mifflin-St Jeor).
TDEE Calculator
Total daily energy expenditure: BMR scaled by real activity.
Calorie Calculator
Daily calories to maintain, lose, or gain weight at a healthy pace.
Macro Calculator
Grams of protein, carbs, and fat from your calorie target and split.
One Rep Max Calculator
Estimate your 1RM from any set, with training percentages.
Running Pace Calculator
Pace per km or mile from your distance and finish time.
Ideal Weight Calculator
Ideal body weight by three clinical formulas, shown as a range.
Body Fat Calculator
Estimate body fat percentage with the US Navy tape method.
Pregnancy Due Date Calculator
Your estimated due date and current pregnancy week from your last period.
Ovulation Calculator
Estimate your fertile window and ovulation day.
Sleep Calculator
Best bedtimes or wake times based on 90-minute sleep cycles.
Blood Alcohol (BAC) Calculator
A rough blood alcohol estimate from drinks, weight, and time.
A1C Calculator
Convert between A1C and estimated average glucose.
Heart Rate Zone Calculator
Your five training heart-rate zones from age and resting rate.
Water Intake Calculator
A daily hydration target from your weight and activity.
Protein Intake Calculator
Daily protein grams matched to your weight and goal.
Body Surface Area (BSA) Calculator
Body surface area by the Mosteller and Du Bois formulas.
Waist-to-Hip Ratio Calculator
Your waist-to-hip ratio and its health-risk category.
Smoking Cost Calculator
See what smoking costs per day, month, year, and decade.
Percentage Calculator
Percent of a number, percent one number is of another, and percent change.
Fraction Calculator
Add, subtract, multiply, or divide fractions — auto-simplified.
Average Calculator
Mean, median, mode, standard deviation, sum and count from any list.
GPA Calculator
Weighted GPA on the 4.0 scale from your grades and credit hours.
Final Grade Calculator
"What do I need on the final?" — answered in one calculation.
Quadratic Formula Calculator
Roots of ax² + bx + c = 0 — real or complex — with the discriminant.
LCM & GCF Calculator
Least common multiple and greatest common factor of any numbers.
Square Root Calculator
The square root of any number — including negative inputs.
Standard Deviation Calculator
Sample and population standard deviation, variance, and mean.
Ratio Calculator
Simplify ratios and solve for a missing term.
Slope Calculator
Slope, y-intercept, and the line equation from two points.
Combination & Permutation Calculator
Compute nCr and nPr for counting problems.
Significant Figures Calculator
Round numbers to a chosen number of significant figures.
Probability Calculator
Probability as a decimal, percentage, and odds.
Exponent Calculator
Raise any base to any power, including negative and fractional exponents.
Logarithm Calculator
Logarithm of a number in any base, plus ln and log base 10.
Rounding Calculator
Round any number to a chosen number of decimal places.
Scientific Notation Converter
Convert numbers to scientific notation, E notation, and back.
Percentage Change Calculator
Percentage increase or decrease between two values.
Mean, Median, Mode Calculator
All three averages plus range from a list of numbers.
Prime Factorization Calculator
Break any integer into its prime factors.
Pythagorean Theorem Calculator
Solve for any side of a right triangle.
Triangle Area Calculator
Area from base and height, or from three sides (Heron's).
Scientific Calculator
Full scientific calculator with trig, log, memory, and keyboard support.
Age Calculator
Exact age in years, months, and days — plus days to your next birthday.
Days Between Dates
Count the days, weeks, and months separating any two dates.
Add or Subtract Days From a Date
What date is 30, 90, or N days (or weeks, months, years) from any date?
Days Until Calculator
A clean count of days remaining until any date.
Hours Calculator (Time Card)
Total worked hours from clock-in/out times, with optional pay.
Business Days Calculator
Count working days (excluding weekends) between two dates.
Week Number Calculator
The ISO 8601 week number for any date.
Roman Numeral Converter
Convert numbers to Roman numerals and back.
Time Duration Calculator
The length of time between two clock times.
Day of the Week Calculator
What day of the week any date falls on.
Age Difference Calculator
The exact age gap between two birth dates.
Add Business Days Calculator
Add or subtract working days from a date.
Weeks Between Dates Calculator
Count the weeks (and days) between two dates.
Time Zone Converter
Convert a time between world time zones, DST-aware.
Unit Converter
Convert length, weight, temperature, area, volume, speed, and data units.
Length Converter
Meters, feet, inches, kilometers, miles — converted exactly.
Weight Converter
Kilograms, pounds, ounces, stone, and tons — converted exactly.
Temperature Converter
Celsius, Fahrenheit, and Kelvin with the exact formulas.
Area Converter
Square meters, square feet, acres, and hectares.
Volume Converter
Liters, gallons (US & UK), cups, pints, and fluid ounces.
Speed Converter
km/h, mph, m/s, and knots converted exactly.
Data Storage Converter
Bytes through terabytes, in both decimal (GB) and binary (GiB).
CM to Inches Converter
Centimeters to inches (and back) with the exact 2.54 definition.
KG to LBS Converter
Kilograms to pounds (and back) using the exact definition.
Celsius to Fahrenheit Converter
°C to °F (and back) with the exact formula.
Liters to Gallons Converter
Liters to US gallons (and back), with the UK gallon one click away.
Pressure Converter
Pascals, bar, PSI, atmospheres, and mmHg converted exactly.
Energy Converter
Joules, calories, kilowatt-hours, and more converted exactly.
Power Converter
Watts, kilowatts, and horsepower converted exactly.
Time Unit Converter
Milliseconds, seconds, minutes, hours, days, and weeks.
Square Feet to Square Meters
Convert sq ft to sq m (and back) with the exact factor.
Fuel Economy Converter
Convert MPG (US & UK) to L/100km and back.
Currency Converter
Convert between 50+ currencies with live ECB exchange rates.
USD to EUR
Convert US Dollars to Euros at today's live rate.
EUR to USD
Convert Euros to US Dollars at today's live rate.
USD to GBP
Convert US Dollars to British Pounds at the live rate.
USD to INR
Convert US Dollars to Indian Rupees at the live rate.
Word Counter
Words, characters, sentences, paragraphs, and reading time — live.
Character Counter
Live character count with and without spaces, plus platform limits.
Case Converter
UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.
Reverse Text
Flip text backwards — by characters or by word order.
Remove Line Breaks
Strip or replace line breaks — with a paragraph-preserving mode.
Slug Generator
Clean, SEO-friendly URL slugs from any title.
Text Repeater
Repeat any text 5×, 10×, 25×, or 100× instantly.
Title Case Converter
Headline-style capitalization with AP-style small-word rules.
Lorem Ipsum Generator
Classic placeholder text — pick the number of paragraphs and copy.
Find and Replace Text
Bulk find and replace in any text, with regex and case options.
Text Compare
Spot the differences between two blocks of text.
Readability Checker
Flesch reading ease and grade level for your writing.
Remove Duplicate Lines
Delete repeated lines from a list, keeping the first of each.
Sort Text Lines
Alphabetize lines A→Z, Z→A, or by length.
Remove Extra Spaces
Collapse double spaces, trim lines, or strip all whitespace.
Text to Binary Converter
Convert text to 8-bit binary and back.
Keyword Density Checker
Top keywords and their density percentage in your text.
JSON Formatter & Validator
Format, validate, and minify JSON with precise error messages.
Base64 Encode / Decode
UTF-8-safe Base64 encoding and decoding in the browser.
URL Encode / Decode
Percent-encode text for URLs, or decode %20s back to readable text.
UUID Generator
Cryptographically random UUID v4s, singly or in bulk.
Hash Generator (SHA-256, SHA-512, SHA-1)
SHA hashes of any text, computed locally with Web Crypto.
Password Generator
Strong random passwords from a cryptographic source — never sent anywhere.
Color Converter (HEX ⇄ RGB ⇄ HSL)
Convert colors between HEX, RGB, and HSL with a live swatch.
Unix Timestamp Converter
Epoch seconds/milliseconds to human dates and back — with live now.
Regex Tester
Test regular expressions live with match highlighting and flags.
JWT Decoder
Decode and inspect JWT header, payload, and expiry — locally.
CSV to JSON Converter
Convert CSV to JSON and JSON to CSV, both directions.
Diff Checker
Compare two texts and highlight added and removed lines.
HTML Encode / Decode
Escape HTML special characters, or decode entities back.
CSS Minifier
Strip comments and whitespace to shrink CSS.
JavaScript Minifier
Remove comments and blank lines from JavaScript.
HTML Minifier
Remove comments and whitespace between HTML tags.
SQL Formatter
Indent and line-break SQL for readability.
JSON String Escape / Unescape
Escape text for a JSON string, or unescape it back.
JSON to YAML Converter
Convert JSON into clean, readable YAML.
YAML to JSON Converter
Convert YAML config into JSON.
XML Formatter
Indent and pretty-print XML by tag depth.
Markdown to HTML Converter
Convert Markdown into clean HTML.
Number Base Converter
Convert between binary, octal, decimal, and hex.
CSS Gradient Generator
Design a linear gradient and copy the CSS.
CSS Box Shadow Generator
Dial in a box-shadow visually and copy the CSS.
Color Palette Generator
Generate shades, complementary, analogous, or triadic palettes.
Cron Expression Parser
Decode a cron schedule into plain English.
HTTP Status Codes Reference
Searchable reference of HTTP status codes and meanings.
MIME Types Lookup
Searchable reference of file extensions and MIME types.
IP Subnet Calculator
Calculate network address, broadcast, host range, and mask from CIDR.
Aspect Ratio Calculator
Simplify width:height to a ratio and scale dimensions proportionally.
CSS Specificity Calculator
Calculate the specificity of any CSS selector with a visual breakdown.
HTML to Markdown Converter
Convert HTML into clean Markdown — headings, lists, links, images, and code.
Markdown Previewer
Live side-by-side Markdown editor with instant preview.
Markdown Table Generator
Build Markdown tables visually with an editable grid and alignment options.
QR Code Generator
Create custom QR codes for URLs, text, or contact details.
Barcode Generator
Generate CODE128, EAN-13, UPC and more as downloadable SVG.
Password Strength Checker
Estimate password entropy, crack time, and weaknesses.
UTM Link Builder
Add UTM tracking parameters to campaign URLs.
Robots.txt Generator
Create a valid robots.txt to guide search crawlers.
XML Sitemap Generator
Turn a list of URLs into a valid XML sitemap.
Meta Tag Generator
Generate SEO title, description, and meta tags.
Open Graph Generator
Generate Open Graph and Twitter Card meta tags.
Htaccess Redirect Generator
Generate Apache 301 redirects and HTTPS/www rules.
URL Shortener
Create short, shareable links with optional custom aliases.
Merge PDF
Combine several PDF files into one, in any order.
Split PDF
Split a PDF into separate files by page ranges.
Extract PDF Pages
Pull selected pages into a new PDF.
Delete PDF Pages
Remove unwanted pages from a PDF.
Reorder PDF Pages
Rearrange the page order of a PDF.
Rotate PDF
Rotate PDF pages 90°, 180°, or 270°.
Add Page Numbers to PDF
Stamp page numbers onto a PDF.
Watermark PDF
Add a text watermark across every page.
JPG to PDF
Convert JPG (and PNG) images into a PDF.
PNG to PDF
Convert PNG (and JPG) images into a PDF.
Edit PDF Metadata
View and edit a PDF's title, author, and keywords.
PDF to JPG
Convert each PDF page into a JPG image.
PDF to PNG
Convert each PDF page into a PNG image.
PDF to Text
Extract the selectable text from a PDF.
PDF Info Viewer
Inspect a PDF's pages, size, and metadata.
PDF to Markdown
Convert a PDF into clean Markdown with headings detected automatically.
Markdown to PDF
Turn Markdown into a styled A4 PDF — headings, lists, quotes, and code.
Image Resizer
Resize images by pixels or percentage, keeping aspect ratio.
Image Cropper
Crop images with a draggable selection and aspect presets.
Image Compressor
Shrink image file size with a live quality preview.
Image Converter
Convert images between PNG, JPG, and WebP.
PNG to JPG
Convert PNG images to JPG, with quality control.
JPG to PNG
Convert JPG images to lossless PNG.
WebP to PNG
Convert modern WebP images to PNG.
PNG to WebP
Convert PNG to smaller WebP images.
Image Rotator & Flipper
Rotate and flip images with a live preview.
Image Color Picker
Pick exact colors from any image as HEX, RGB, HSL.
Image Color Palette Extractor
Extract the dominant colors from any image.
Add Watermark to Image
Add a text watermark to an image with live preview.
Favicon Generator
Generate favicon sizes + Apple touch icon from one image.
Image to Base64
Encode an image as a Base64 data URI for inline use.
Color Blindness Simulator
See how your image looks to people with 8 types of color vision deficiency.
Grammar Checker
Catch grammar, spelling, and style mistakes with one-click fixes.
Paraphrasing Tool
Rewrite text in a different style while keeping the meaning.
Plagiarism Checker
Check whether passages of text appear elsewhere on the web.
Rent vs Buy Calculator
Find out whether renting or buying makes better financial sense over your time horizon.
Home Affordability Calculator
How much house can you afford? Based on the 28/36 rule lenders use.
Property Tax Calculator
Estimate annual and monthly property tax from home value and mill rate.
Closing Costs Calculator
Estimate buyer or seller closing costs as a percentage of the home price.
Rental Yield Calculator
Gross yield, net yield, cap rate, and payback period for a rental property.
House Price-to-Income Ratio
Is a home priced within your income range? Check the price-to-income ratio.
Square Footage Calculator
Calculate area in square feet, square meters, and square yards.
Capital Gains Tax Calculator
Estimate US federal capital gains tax on real estate or investment sales.
Concrete Calculator
Cubic yards of concrete and number of bags for any slab or footing.
Paint Calculator
Gallons of paint needed for a room, with door and window deductions.
Flooring Calculator
Square feet of flooring with waste allowance and box count.
Gravel Calculator
Cubic yards and tons of gravel for driveways, paths, and landscaping.
Mulch Calculator
Cubic yards and bags of mulch for garden beds and landscaping.
Fence Calculator
Posts, rails, and pickets needed for any wood fence.
Roof Pitch Calculator
Roof pitch in X:12, degrees, and area multiplier from rise and run.
Staircase Calculator
Steps, riser height, and total run for building a staircase.
Grams to Cups Converter
Convert grams to cups for flour, sugar, butter, and 20+ ingredients.
Recipe Scaling Calculator
Scale any recipe ingredient up or down to a new serving count.
Cooking Unit Converter
Convert between teaspoons, tablespoons, cups, fluid ounces, and millilitres.
Calories Burned Calculator
Calories burned during exercise by activity, weight, and duration.
Ohm's Law Calculator
Solve for voltage, current, or resistance given any two values.
Resistor Color Code Calculator
Decode a 4-band resistor color code to its resistance value.
Voltage Divider Calculator
Output voltage, current, and power for a resistor voltage divider.
Torque Calculator
Calculate torque in N·m, ft·lb, and in·lb from force and moment arm.
Newton's Second Law Calculator
Solve F = ma for force, mass, or acceleration.
Density Calculator
Solve for density, mass, or volume (ρ = m/V).
pH Calculator
H⁺ concentration, pOH, and classification from a pH value.
Half-Life Calculator
Remaining quantity after radioactive decay over any time period.
Kinematics Calculator
Solve SUVAT equations for velocity, acceleration, time, and displacement.
Z-Score Calculator
Z-score, percentile, and probability from a value, mean, and standard deviation.
Confidence Interval Calculator
Confidence interval and margin of error from sample statistics.
Sample Size Calculator
Required sample size for a survey at a given confidence and margin of error.
Correlation Coefficient Calculator
Pearson correlation coefficient (r) and R² from two data lists.
P-Value Calculator
P-value and significance from a z-statistic (one- or two-tailed).
CAC Calculator
Customer Acquisition Cost and LTV:CAC ratio for your marketing spend.
Customer Lifetime Value Calculator
Customer lifetime value (LTV) from purchase value, frequency, and lifespan.
ROAS Calculator
Return on ad spend, net profit, and break-even ROAS.
Email Marketing ROI Calculator
Projected revenue and ROI from an email campaign funnel.
Employee Turnover Calculator
Turnover rate and estimated replacement cost for your team.
Gross Margin Calculator
Gross margin, gross profit, and markup from revenue and cost.
Dollar-Cost Averaging Calculator
Projected portfolio value from regular monthly investments.
Crypto Profit/Loss Calculator
Profit or loss on a crypto trade, including fees.
Stock Return Calculator
Total and annualized return on a stock investment, including dividends.
Dividend Yield Calculator
Dividend yield and annual income from a dividend stock.
P/E Ratio Calculator
Price-to-earnings ratio and earnings yield for a stock.
Paycheck Calculator
Estimate take-home pay after federal tax, FICA, state tax, and 401(k).
VAT Calculator
Add or remove VAT at any rate, with the tax amount broken out.
Self-Employment Tax Calculator
Estimate US self-employment (SECA) tax on your net business profit.
Runs in your browser
Calculations and file processing happen on your device. Your inputs are never uploaded or stored.
No signup, no cost
Every tool is free and instant. No account, no paywall, no email required.
Built for accuracy
Every formula is verified, with clear explanations and FAQs on every tool page.