Your ultimate toolkit for productivity. Access 87+ professional utilities for developers, designers, and everyone in between.
Calculate statistical significance for A/B tests using Two-Proportion Z-Test. Determine if your conversion rate improvements are statistically valid.
Calculate your exact age in years, months, and days. Discover your total life duration in weeks, hours, and seconds.
Compare API costs for major AI models like GPT-4, Claude, and Gemini. Predict your monthly expenses based on token usage accurately.
Convert between Annual Percentage Yield (APY) and Annual Percentage Rate (APR). Essential for comparing financial products in crypto staking and traditional banking.
Calculate your monthly car payment including trade-in value, down payment, interest rate (APR), and sales tax. Perfect for US car buyers.
Estimate your blood alcohol concentration (BAC) and time to sober using the Widmark formula.
Convert numbers between binary, octal, decimal, and hexadecimal systems instantly. Supports large numbers and fast conversion.
Securely encode and decode text to Base64 format instantly. Perfect for developers and secure data transmission online.
Generate secure Bcrypt hashes and verify passwords against existing hashes. Free, fast, and runs entirely in your browser.
Classify your blood pressure readings according to American Heart Association guidelines. Get instant categorization with personalized health recommendations.
Calculate your Body Mass Index (BMI) to determine if you are in a healthy weight range for your height instantly and free.
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation.
Estimate your body fat percentage using the US Navy Method. Accurate and fast body composition analysis.
Visually design and generate CSS box-shadow code with real-time preview and multiple shadow layers.
Calculate the point where your business starts making a profit. Essential for entrepreneurs and business planning.
Estimate the market value of your company using SDE and Revenue multipliers.
Calculate your Customer Acquisition Cost (CAC) and Lifetime Value (LTV) to measure business health and unit economics accurately.
Calculate your daily calorie needs for weight loss using the Mifflin-St Jeor equation. Get a personalized 12-week weight loss timeline.
Calculate customer churn rate, retention rate, and health status for your subscription or SaaS business.
Convert colors between HEX, RGB, and HSL formats instantly. Preview colors visually and copy values with one click.
Calculate the future value of your investments with monthly contributions and compounding interest. See your wealth grow over time.
Calculate conversion rate (CR), cost per acquisition (CPA), ROAS, and revenue from your marketing campaigns. Essential for e-commerce and SaaS analytics.
Calculate Cost Per Mille (CPM), advertising budget, or total impressions instantly. Essential for marketers and publishers.
Calculate how long it will take to pay off your credit card balance and how much interest you can save with extra payments.
Build and debug cron schedules with a visual interface and human-readable output.
Calculate your potential profits or losses from cryptocurrency investments, including exchange fees.
Plan your debt payoff using the Snowball method. Prioritize smallest balances first, build momentum, and track payoff timeline.
Calculate the final price after applying discounts and sales tax (VAT). Perfect for Black Friday shopping, e-commerce, and business pricing.
Calculate the growth of your dividend portfolio with reinvestment (DRIP) and tax considerations. Plan your path to financial independence.
Calculate the return on investment for your email campaigns based on opens, clicks, and conversions.
Calculate your emergency savings target based on monthly expenses, coverage months, and your current savings progress.
Create professional multi-size favicons for your website instantly. Convert PNG or JPG to ICO format for free online.
Calculate your optimal hourly rate as a freelancer. Factor in desired income, expenses, taxes, and billable hours to price your services profitably.
Generate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) instantly in your browser. Free online tool for developers and security professionals.
Safely encode characters to HTML entities to prevent XSS attacks, or decode them back to readable text.
A professional-grade JSON translation tool. Sync structures, manage keys, and translate with a minimalist dual-pane interface.
Calculate your ideal body weight based on popular scientific formulas like Miller, Devine, Robinson, and Hamwi.
Reduce the file size of your JPG, PNG, and WebP images instantly. Fast, secure, and works entirely in your browser.
Calculate the future value of your money and see how inflation erodes purchasing power over time with our accurate tool.
Calculate IPv4 network boundaries, broadcast addresses, and usable host ranges from an IP address and CIDR prefix. Essential for network admins and DevOps engineers.
Format, validate, and beautify your JSON data instantly. Make your code readable and error-free with our free online tool.
Convert arrays of JSON objects into tabular CSV format. Handle escaping and delimiters safely with our free online converter.
Convert JSON objects to clean TypeScript interfaces instantly. Supports nested objects and arrays.
Decode and debug JSON Web Tokens (JWT) locally in your browser. Secure, private, and fast.
Calculate your ideal macros for a ketogenic diet. Find the right balance of fats, proteins, and carbs to reach ketosis.
Calculate your Lean Body Mass using the clinically validated Boer formula. Instant results for body recomposition.
Calculate monthly payments, total interest, and view a full amortization schedule for any loan.
Compare two different loan scenarios side-by-side to see which one saves you more money.
Generate placeholder Lorem Ipsum text instantly. Create dummy text for wireframes, mockups, and templates in seconds.
Generate valid 48-bit MAC addresses for testing, network configuration, and IoT development.
Calculate your daily calorie and macronutrient needs using the Mifflin-St Jeor equation. Perfect for flexible dieting and body recomposition.
Calculate gross margin, markup, and profit based on cost and revenue.
Calculate your monthly mortgage payments, including principal, interest, and total cost over the life of the loan instantly.
Compare your current mortgage with a new refinance deal to see how much you can save.
Calculate your one-rep max (1RM) using the Epley and Brzycki formulas. Generate a percentage-based training table for strength programming.
Calculate your estimated ovulation date, fertile window, and next period based on your menstrual cycle. Precise tracking for family planning.
Calculate your running pace, speed, and predict your race times for 5K, 10K, Half Marathon, and Marathon.
Create strong and secure passwords instantly. Customize length and character sets to protect your digital life.
Calculate percentages instantly. Find X% of Y, or what percentage X is of Y. Fast, accurate, and free online tool.
Calculate your estimated due date (EDD) using Naegele's Rule. Track your pregnancy progress and key milestones.
Estimate daily protein intake target based on weight, activity and goals.
Create customizable QR codes instantly for URLs, text, and more. Download in high-quality PNG or SVG formats.
Test and debug regular expressions in real-time with highlighting and capture groups.
Calculate your Return on Ad Spend (ROAS) to measure the effectiveness of your advertising campaigns.
Calculate the Return on Investment (ROI) and annualized ROI for any investment instantly. Free, fast, and accurate financial tool.
Estimate how long it takes for an investment to double using the Rule of 72 heuristic, plus compare with exact mathematical calculation.
Calculate your SaaS Monthly Recurring Revenue (MRR), Annual Recurring Revenue (ARR), and Customer Lifetime Value (LTV) with precision. Essential for founders and startups.
Convert your annual salary to an hourly, daily, weekly, and monthly rate instantly. Includes tax estimation.
Advanced scientific calculator with trigonometric functions, logarithms, and more. Supports degrees and radians.
Generate standard HTML meta tags, Open Graph (OG), and Twitter Cards for your website instantly. Optimize for search engines and social media.
Calculate the best times to wake up or go to bed based on 90-minute sleep cycles. Wake up feeling refreshed by avoiding the middle of a sleep cycle.
Beautify and standardize SQL queries with selectable dialect and keyword casing.
Calculate how many months your startup can survive based on current cash and burn rate.
Calculate your 5 heart rate training zones using the Karvonen formula. Optimize workouts for fat burn, aerobic fitness, and peak performance.
Calculate your Total Daily Energy Expenditure (TDEE) to understand how many calories you burn per day based on your activity level.
Convert time between different timezones instantly. Stay synchronized with global teams and events.
Easily calculate tips and split the bill among friends instantly. Fast, accurate, and supports multiple currencies for free.
Estimate token counts for GPT-4, Claude, and Gemini instantly. Optimize your AI prompts and stay within context limits easily.
Convert between different units of length, mass, and temperature instantly.
Easily encode or decode strings to make them URL-safe. Supports both full URI and URI component processing with instant results.
Generate trackable URLs with UTM parameters for Google Analytics 4 and other analytics platforms. Perfect for marketing campaigns.
Generate cryptographically strong UUIDs (v4) in bulk with formatting options.
Calculate Value Added Tax (VAT) for any amount instantly. Add or extract VAT with custom or regional rates. Free and accurate.
Calculate your daily water needs based on weight, activity level, and climate. Stay hydrated and healthy.
Count words, characters, sentences, and paragraphs in your text instantly. Free, fast, and secure online text analysis tool.
Format and beautify XML documents instantly. Fix indentation, organize nested elements, and validate XML syntax online.
Convert YAML to JSON and JSON to YAML instantly in the browser with syntax validation.