24 Game Solver & Trainer - Enter 4 numbers to solve the 24 game with +, -, *, /. Generate random practice cards by level and train mental arithmetic with instant answer checks. New

Age Calculator - Calculate your exact age in years, months, weeks, days, hours, minutes, and seconds with interactive visualization, birthday countdown, life milestones tracker, and personalized insights.

Air Conditioner BTU Calculator - Calculate the exact BTU cooling capacity needed for your room based on dimensions, ceiling height, sun exposure, occupancy, and other factors. Get AC unit size recommendations.

Aquarium Substrate Calculator - Calculate exactly how much substrate (gravel, sand, aqua soil) is needed for your aquarium based on tank dimensions and desired depth. Features live 3D tank preview, multiple substrate types, and instant weight calculations in pounds and kilograms. New

Aquarium Volume & Stocking Calculator - Calculate accurate aquarium water volume for rectangular, cylindrical, bow front, hexagonal, and corner tanks. Get fish stocking recommendations using inch-per-gallon and surface area methods with animated 3D tank visualization. New

Banana Radiation Calculator - Convert any radiation exposure into Banana Equivalent Dose (BED). Find out how many bananas equal a dental X-ray, CT scan, or airline flight — free online calculator with comparison chart. New

Barcode Generator - Generate professional barcodes in multiple formats (CODE128, CODE39, EAN-13, UPC, ITF-14, MSI, Pharmacode) with customizable appearance. Download as SVG or PNG for free. New

BBQ Calculator - Calculate exactly how much meat, buns, side dishes, condiments, drinks, and charcoal or propane you need for a BBQ based on guest count, appetite level, grill type, and event style. Get a complete shopping list with per-person breakdowns. New

Beer Chill Time Calculator - Calculate exactly how long your beer needs to chill in the fridge, freezer, or ice bath to reach the perfect drinking temperature. Uses Newton's Law of Cooling with support for cans, bottles, growlers, and different beer styles. New

Cocktail ABV Calculator - Calculate the final ABV (alcohol by volume) of any cocktail or mixed drink. Add ingredients with their volume and ABV, factor in ice melt dilution, and get an accurate alcohol percentage with visual breakdown and step-by-step calculation. New

Coffee Brew Ratio Calculator - Calculate the optimal coffee-to-water ratio for your preferred brewing method including Pour Over, Espresso, French Press, Cold Brew, AeroPress, Moka Pot, and Drip Coffee. Adjust strength from light to extra strong. New

Commute Life Wasted Calculator - Calculate the total days, months, and years of your life spent commuting to work. Enter your daily round-trip travel time and years worked to reveal the staggering total and explore what else you could do with that time. New

Cost of Smoking Calculator - Calculate the true financial cost of smoking over time. See daily, monthly, yearly, and lifetime costs with investment opportunity analysis and health recovery timeline.

Daily Time Savings Calculator - Calculate how much time you can save per year by saving just a few minutes each day. Discover the cumulative impact of small daily time savings with detailed breakdowns and visual comparisons. New

Email Reply Time Calculator - Calculate the optimal email reply time based on sender status, urgency, and your relationship. Avoid looking too eager or too aloof with our playful timing algorithm that factors in workplace dynamics and social psychology. New

Falling Through Earth Calculator - Calculate exactly how long it takes to fall through a hypothetical tunnel drilled through the center of the Earth. Explore the classic ~42-minute gravity train problem with both uniform density and realistic PREM variable density models. See maximum speed at the core, experience weightlessness timing, and compare with real-world travel speeds. New

Homebrew ABV Calculator (Alcohol by Volume) - Calculate the alcohol by volume (ABV) in your homebrewed beer, wine, cider, or mead using original and final gravity readings. Features multiple formulas, Brix support, visual fermentation animation, attenuation calculation, and calorie estimation. New

How Old Are You? - Find out exactly how old you are in years, months, weeks, days, hours, minutes, and seconds. Get life milestones, birthday countdown, zodiac sign, and detailed age breakdown.

IP Address to Binary Converter - Convert IP addresses to binary with interactive visual breakdown, step-by-step explanation, and multiple output formats. Supports both IPv4 and IPv6 addresses.

IP Address to Hex Converter - Convert IP addresses (IPv4/IPv6) to hexadecimal with interactive visual breakdown, multiple output formats, step-by-step conversion explanation, and network analysis. Featured

Is JavaScript Enabled? - Instantly check if JavaScript is enabled in your browser and explore a full diagnostic of your browser's JavaScript capabilities, APIs, and features.

Job Finder - Find your dream job by searching millions of listings from thousands of job boards, company pages, and recruitment sites in one place.

Kakuro Generator - Generate Cross Sums (Kakuro) puzzles with adjustable size, difficulty, symmetry, and optional solution reveal for printing or practice. New

KenKen Generator (Calcudoku) - Generate KenKen puzzles with valid cage targets, operation mix controls, and optional solution reveal for classroom practice or daily brain training. New

Lego Brick House Calculator - Estimate how many standard 2×4 Lego bricks are needed to build a life-size house. Enter your house dimensions, wall thickness, and window/door count to get a detailed brick count, total weight, estimated cost, and fascinating comparisons with real-world Lego structures. New

Maze Generator - Generate random, solvable mazes with custom dimensions, start/end points, and colors. Download as PNG, SVG, or animated GIF solution. New

Meeting Cost Ticker - See the real-time cost of your meeting ticking up like a taximeter. Enter the number of attendees and average hourly rate, then start the timer to watch the cumulative cost grow second by second. New

Miles per Gallon Calculator - Calculate MPG (miles per gallon), convert to L/100km, estimate fuel costs, compare vehicle efficiency, and track CO2 emissions with our comprehensive fuel economy calculator.

Nonogram Generator (Picross) - Upload an image and instantly create a Nonogram puzzle with row and column clues, answer key, and printable puzzle board. New

Number to Word Converter - Convert any number to English words instantly. Supports cardinal, ordinal, and currency formats. Featured

Parking Ratio Calculator - Calculate the required number of parking spots based on building square footage and usage type. Supports retail, office, residential, restaurant, medical, hotel, industrial, and more with ITE standard parking ratios. New

Penny Drop Impact Calculator - Calculate the terminal velocity and impact force of a penny dropped from any height. Debunk the famous Empire State Building penny myth with real physics — drag coefficients, air density, and energy comparisons. New

Pizza Party Planner - Calculate the perfect number of pizzas for your party based on guest count, appetite level, pizza size, and event type. Get detailed breakdowns with cost estimates, vegetarian splits, and per-person serving analysis. New

Plant Spacing Calculator - Calculate the optimal number of plants for any garden area using square grid or triangular spacing layouts. Visualize planting patterns, compare efficiency, and maximize your garden yield with interactive layout diagrams. New

QR Code Generator - Create custom QR codes for URLs, text, WiFi, email, and phone numbers. Customize colors, size, error correction, and download as PNG instantly.

Quote Finder - Find thousands of quotes by author or phrase. Dive into a comprehensive quote database today!

Sudoku Generator & Solver - Generate unique 9x9 Sudoku puzzles from Easy to Evil, solve your own puzzles instantly, and print clean puzzle sheets to PDF for offline play. New

Wedding Alcohol Calculator - Estimate how many bottles of wine, beer, and spirits you need for a wedding or party. Customize guest count, event duration, drinking levels, and beverage mix to get accurate drink estimates with a visual shopping list. New

Word to Phone Number Converter - Convert words and phrases to phone numbers using the international standard T9 keypad letter mapping. Perfect for creating memorable phone numbers and understanding alphanumeric encoding. Featured