Free tools. Just the numbers.
Single-purpose calculators and converters that get you the answer immediately — no account, no forced contact form, no waiting.
Subnet Calculator
A subnet mask calculator (subnet calc) with a subnet cheat sheet: get network address, broadcast address, subnet mask, wildcard mask, and usable host range from an IPv4 address and CIDR prefix or mask.
Mortgage Payment & Payoff Calculator
Enter home price, down payment, rate, and term to get your monthly payment, total interest, and total loan cost — plus a payoff calculator for extra payments.
QR Code Generator (Free QR Code Maker)
Turn any URL or text into a QR code instantly, live preview included, and download it as a PNG — no watermark.
Percentage & Percentile Calculator
Find X% of a number, percent change, percent off a price, or a value's percentile rank in a data set.
Timezone Converter
Pick a time and see it across 60+ world cities, side by side, with working-hours color coding.
Paycheck Tax Calculator & Estimator
Enter gross salary and state to see net take-home pay after federal, state, and FICA deductions — a fast paycheck estimator for any pay period.
TDEE, Calorie & Macro Calculator
Enter your stats and activity level to get your TDEE, maintenance calories, a calorie deficit target for weight loss, and a protein/carb/fat split for cutting, maintaining, or bulking.
Word Unscrambler & Word Finder
Enter your letters, get every valid word you can spell, sorted by length. Great for Scrabble and Words With Friends.
Pregnancy Due Date & Ovulation Calculator
Estimate your due date from your last period, conception date, or IVF transfer — or find your next ovulation and fertile window.
RGB, HEX & CMYK Color Picker & Converter
Convert between RGB, HEX, and CMYK instantly, or pick a color straight off your screen — includes RGB to HEX, HEX to RGB, and CMYK conversions, plus the closest named color.
Metric & Imperial Unit Converter
Convert length, weight, volume, speed, and temperature between metric and imperial units instantly — no signup.
SVG to Power Apps & Power Fx Converter
Paste, drop, or fetch an SVG and get a ready-to-paste Power Fx formula for a Power Apps Image or HTML Text control.
Bible Weights & Measures Converter
Convert cubits, spans, shekels, ephahs, hins, and talents to modern Metric or US measurements, with worked examples from Scripture.
Free Invoice Generator
Build a professional invoice with line items, tax, and totals, see it live, and download it as a PDF — no signup, no watermark.
Password Generator
Generate a strong, random password with your choice of length and character types, with a live strength estimate — built with the Web Crypto API, nothing sent to a server.
BMI Calculator
Enter height and weight in metric or US units to get your Body Mass Index, WHO category, and a healthy weight range for your height.
Citation Generator
Cite a website, book, or journal article in APA, MLA, or Chicago (Author-Date) style and get a ready-to-paste reference entry and in-text citation.
Tip Calculator
Enter your bill, pick a tip percentage, and split the total evenly between any number of people.
Loan Calculator
For an auto or personal loan: enter the loan amount, or a purchase price with trade-in and tax, to get your monthly payment and total interest.
Compound Interest Calculator
Enter a starting amount, monthly contribution, rate, and years to see your future balance and a year-by-year growth schedule.
Debt Payoff Calculator
Compare the snowball and avalanche payoff strategies side by side for your debts — payoff time, total interest, and which one wins.
UTM / Campaign Link Builder
Add utm_source, utm_medium, utm_campaign, and more to any URL for Google Analytics campaign tracking.
JSON Formatter & Validator
Beautify, minify, or validate JSON with adjustable indentation, alphabetical key sorting, and exact line/column error locations — runs entirely in your browser.
UUID Generator
Generate RFC 4122 version 4 UUIDs one at a time or in bulk, with uppercase and hyphen formatting options — built with the Web Crypto API, nothing sent to a server.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to text, with full Unicode support, a URL-safe alphabet option, and optional padding.
Age & Date Difference Calculator
Find your exact age or the time between any two dates in years, months, and days, plus total days, weeks, and months.
HTML Formatter & Beautifier
Beautify or minify HTML using a real browser-grade parser, with adjustable indentation — script, style, and pre content is preserved exactly.
SQL Formatter & Beautifier
Clean up messy SQL with uppercase keywords, one clause per line, and indented conditions — handles SELECT, INSERT, UPDATE, DELETE, joins, and subqueries.
Regex Tester
Test a regular expression against your own text with live highlighted matches, capture groups, and a find-and-replace preview.
Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes from text or a file, entirely in your browser.