General Tools

Estimate 0–60 mph acceleration, quarter mile elapsed time, trap speed, and power-to-weight ratio from horsepower and curb weight. Supports hp, kW, PS, pounds, kilograms, drivetrain loss, and launch grip.

Work out how much 2-stroke oil to add to your gas at any ratio (16:1 to 100:1 or custom). Enter litres or US gallons, get oil in millilitres and fluid ounces, compare every common ratio, or check a mix you already made.

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

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

Suggest thoughtful, personalised presents based on the recipient, occasion, budget and their interests. Get a curated list of gift ideas with the reason each one fits, an estimated price and a one-click shopping link.

Build a day-by-day trip plan for any destination. Pick your city, number of days, pace, budget and interests to get morning, afternoon and evening activities, where to eat, local tips and a map link for every stop.

Type a question like 5 miles in km, how many tablespoons in a cup, or 70 mph to m/s and get the answer, the formula, a ladder of related units and a real-world comparison. Length, mass, volume, temperature, speed and more.

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.

Find the right aquarium heater wattage from your water volume and the gap between target water and room temperature, then snap it to a real purchasable size. Supports gallons and litres, Celsius and Fahrenheit, with a tank diagram.

Work out how much substrate - gravel, sand or aqua soil - your aquarium needs from the tank dimensions and the depth you want. Includes a live 3D tank preview, several substrate types and weights in pounds and kilograms.

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.

Generate baby name ideas by gender, cultural origin, style and starting letter, each with its meaning and roots. Flip a card to see origin and syllables, check how a name flows with your surname, and save favourites to a shortlist.

Calculate how much food weight to carry for a backpacking, trekking, or thru-hiking trip. Estimate total calories, food weight, daily carry, safety buffer, meal split, and day-by-day pack weight burn-down with imperial or metric units.

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.

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.

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.

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.

Convert betting odds between American, decimal, fractional and implied probability. See your payout for any stake, your break-even win rate, and enter both sides of a market to expose the bookmaker's vig and the fair no-vig odds.

Enter one date of birth and see your age in three systems: Western, Chinese xusui and Korean traditional age - with the next Lunar New Year and birthday milestones on one timeline, plus Chinese and Western zodiac signs.

Find out how many outfits a capsule wardrobe of tops, bottoms, dresses, layers and shoes can make. Shows a combination matrix, how many days you can go without repeating an outfit, and your outfits-per-item efficiency.

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.

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.

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.

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

Generate custom crossword puzzles from your own words and clues. Arranges intersections for the best fit, numbers the Across and Down clues, and produces a puzzle you can solve online or print for classrooms and events.

Encrypt famous quotes or your own text with a substitution cipher, then solve the puzzle interactively with letter tracking, hints, animated reveals and difficulty levels. Good for brain training, lessons and word-puzzle fans.

Free online CTR calculator to compute click-through rate from impressions and clicks. Compare multiple campaigns, see industry benchmarks, and find how many clicks you need to hit your target CTR.

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.

Find the most efficient way to load your dishwasher. Enter what needs washing and your machine size to sort every item into the right rack zone, check spray-arm clearance, count the cycles needed and rate water and energy use.

Calculate the Elo rating change after a match from both ratings, the result and your K-factor. See the new rating, win probability, a live win/draw/loss scenario table and an expectancy curve, for chess, esports or any Elo ranking.

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.

Estimate Facebook and Instagram ad costs based on your budget, industry, campaign objective, and target audience. Calculate CPM, CPC, CPA, projected reach, clicks, and conversions with real industry benchmarks.

Work out how long it takes to fall through a tunnel drilled clean through the centre of the Earth. Explore the classic 42-minute gravity train with both uniform-density and realistic PREM models, and see the top speed at the core.

Calculate how much NPK fertilizer to apply from garden bed area, target nutrient rate, and the N-P-K percentages printed on the fertilizer bag. Shows exact product weight plus N, P2O5, and K2O delivered.

Calculate the great-circle air-route distance between airports, major cities, or coordinates. Estimate flight time using typical aircraft cruising speeds, route allowance, nautical miles, bearing, and an animated route map.

Estimate average first and last frost dates from a USDA hardiness zone and geographic region. Plan safe planting windows, growing season length, and crop timing around frost risk.

Generate Futoshiki inequality logic puzzles on grids from 4x4 to 9x9. Fill each row and column with unique numbers while respecting the greater-than and less-than signs, and solve with pencil marks, a timer, error checking and printing.

Calculate real-world gas mileage from fill-up data. Enter distance driven or odometer readings plus fuel added to get MPG, L/100km, km/L, trip cost, range, and CO2 estimates.

Mix hair dye with confidence. Enter your colour-to-developer ratio and either the total you want, the colour you already have, or your hair length, and get the exact grams or millilitres of each plus how many tubes you need.

Generate Hashi (Hashiwokakero) bridge puzzles at four difficulty levels. Connect islands with single or double bridges so each island's number matches its bridges and all islands form one network. Includes a timer and solution checking.

Calculate the alcohol by volume in homebrewed beer, wine, cider or mead from original and final gravity readings. Offers several formulas, Brix support, a fermentation animation, attenuation figures and a calorie estimate.

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.

Calculate the return on investment for influencer marketing campaigns. Analyze cost per engagement, earned media value, conversion rates, and compare performance across Instagram, TikTok, YouTube, and Twitter/X with industry benchmarks.

Calculate your Instagram engagement rate from likes, comments, saves, and followers. Compare against industry benchmarks by account size and get actionable tips to boost your social media performance.

Convert normal text into 25+ stylish Unicode fonts for Instagram bios, captions, and comments. Includes bold, italic, script, gothic, bubble, and decorative text styles that work on any platform.

Create and download professional PDF invoices in seconds. Add your logo, unlimited line items, tax, discount and shipping, pick any currency, and export or print. A live preview updates as you type and drafts auto-save locally.

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

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

Calculate subnet masks, network addresses, broadcast addresses, and available host ranges from CIDR notation. Includes interactive binary visualization and address space mapping.

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

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

Generate Julia set fractals from any complex parameter c. Pan and zoom a high-resolution canvas, pick c from a live Mandelbrot map, animate it along an orbit, trace the iteration path, and export a PNG or a shareable URL.

Calculate your K/D ratio, KDA and win rate from kills, deaths, assists, wins and losses. See your skill tier on a gauge, how many kills reach a target K/D, and use the what-if simulator to project your next few matches.

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

Generate KenKen puzzles with valid cage targets, operation mix controls, and optional solution reveal for classroom practice or daily brain training.

Generate Killer Sudoku puzzles that combine classic Sudoku rules with Kakuro-style cage sums. Choose Easy to Expert, solve interactively with pencil marks and a timer, or print for offline play. Every puzzle has a unique solution.

Explore common outdoor knots with an interactive chooser, animated rope diagrams, step-by-step tying instructions, best-use guidance, safety notes and a comparison table for camping, hiking, boating, tarps and loads.

Generate fractals from Lindenmayer-system rules. Pick a preset - Koch snowflake, Sierpinski, dragon curve, fractal tree or plant - or write your own axiom, production rules and turtle angle, and watch a depth-coloured SVG draw itself.

Find the right amount of laundry detergent for any wash. Tailors the dose to detergent type, load size, soil level, water hardness and machine, shows it on a measuring cap, and estimates the money you waste by overfilling.

Calculate how much lawn fertilizer to apply from lawn area, nitrogen rate per 1,000 sq ft, and the N-P-K fertilizer analysis. Includes product weight, bag coverage, and nutrients applied.

Estimate how many standard 2x4 Lego bricks it takes to build a life-size house. Enter your house dimensions, wall thickness and window and door count to get a brick count, total weight, estimated cost and real-world comparisons.

Calculate how much money you save by switching from incandescent or CFL to LED light bulbs. Compare energy costs, bulb replacement costs, lifespan, and see your payback period with a 10-year cost projection.

Explore the Mandelbrot fractal interactively. Pan and zoom a high-resolution canvas, pick from eight palettes, raise the iteration depth for infinite detail, and hover any point to see its matching Julia set in real time.

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

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.

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.

Upload an image and instantly create a Nonogram puzzle with row and column clues, answer key, and printable puzzle board.

Convert any number to English words instantly. Supports cardinal, ordinal, and currency formats.

Blend two fuels to hit a target octane rating. Enter each fuel's octane plus a target to get the exact mix recipe, or two known volumes to check the octane you end up with. Uses volume-weighted blending with AKI, RON or MON.

Generate a personalized packing checklist by destination, weather, trip length, trip type, luggage style, and number of travelers. Includes carry-on essentials, weather gear, activity items, shared group gear, and pre-trip reminders.

Quickly compare A-series paper sizes, US Letter, Legal, Tabloid, and custom paper dimensions in mm, inches, points, pixels, aspect ratio, and printable area.

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.

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.

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.

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.

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

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

Calculate how much soil mix you need for a raised garden bed from length, width, and depth. Includes cubic feet, cubic yards, liters, fill ratio, settling allowance, bag estimates, and soil mix breakdowns.

Free ROAS calculator to measure advertising efficiency. Calculate return on ad spend, compare multiple campaigns, find target revenue needed, and benchmark against industry averages.

Calculate the exact water and energy cost of each shower based on duration, flow rate, water heater type, and local utility rates. Compare daily, monthly, and yearly costs with water-saving tips and habit change projections.

Generate the Sierpinski triangle at any depth by deterministic recursive subdivision or the chaos-game random walk. Compare both algorithms side by side, colour triangles by depth, and export a crisp SVG or PNG.

Convert sleeping bag temperature ratings between EN, ISO and common brand labels. Decode comfort, limit and extreme ratings, estimate women's equivalents, and adjust for cold sleepers, pad R-value and wet or windy conditions.

Generate Slitherlink loop puzzles at four difficulty levels. Connect adjacent dots into a single closed loop guided by the number clues inside cells, with interactive solving, a timer, error checking and a solution reveal.

A complete reference for recommended image and video dimensions across Instagram, Facebook, X, YouTube, TikTok, LinkedIn and Pinterest, covering profile pictures, covers, posts, stories, reels and ad formats with visual previews.

Find the best times to post on Instagram, Twitter/X, Facebook, TikTok, LinkedIn, and YouTube. Get personalized posting schedules based on your audience timezone with visual heatmaps and golden hour recommendations for maximum engagement.

Calculate the return on investment for social media marketing campaigns. Input ad spend, revenue generated, engagement metrics, and conversion rates to measure campaign effectiveness with visual performance analysis.

Free online tool to check if a username is available across 15+ social media platforms instantly. Find and claim your unique handle on Instagram, X/Twitter, TikTok, YouTube, GitHub, and more.

A speedrun split timer with personal-best comparison. Build your run, time each segment to the millisecond, and see live ahead and behind deltas against your PB, gold segments, Sum of Best and possible time save. Works offline.

Generate classic spirograph rosette patterns. Simulates the hypotrochoid and epitrochoid curves a pen traces as a small circle rolls inside or outside a larger one. Layer up to three pens, tune the radii, and export SVG or PNG.

Find the right self-storage unit size from a real inventory of your furniture, appliances and boxes. Tick what you need to store and how tightly you will pack, and see the recommended unit from 5x5 to 10x30 and how full it will be.

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

Calculate the right tent footprint size from your tent floor dimensions. Choose imperial or metric units, set the undercut margin per side, and get finished footprint dimensions, DIY cut size, area coverage, and a clear visual layout.

Generate gap-free Escher-style tessellations from regular and semi-regular tiles - triangles, squares, hexagons, rhombi, octagons and bricks. Colour them with curated palettes, curve the edges Escher-style, and export SVG or PNG.

Free TikTok engagement rate calculator. Analyze video performance by measuring engagement from views, likes, comments, and shares with visual benchmarks and actionable insights.

Free TikTok money calculator to estimate creator earnings from the Creator Fund, brand deals, and live gifts. Enter your views, followers, and engagement rate to see potential monthly and yearly revenue by niche.

Decode the load index and speed rating from your tire code. Paste a size like 225/45R17 94V to see the maximum load per tire in kg and lbs, the total your set can carry, and the speed rating in km/h and mph with reference charts.

Compare two tire sizes side by side with visual diagrams, speedometer correction, and detailed measurements including diameter, circumference, sidewall height, and revolutions per mile.

Estimate how much tread life and how many miles your tires have left. Enter current tread depth and either a known wear rate or two measurements taken some distance apart to get miles until the legal limit and a replacement date.

Compare toilet paper rolls by price, sheets, and ply count to find the true cost per sheet and cost per effective wipe. Add up to 5 products side-by-side to identify the best value.

Calculate the ideal trailer tongue weight - usually 10-15% of total trailer weight - for sway-free towing. Enter the loaded weight for a target range, or a measured weight for a safety diagnosis and advice on which way to shift cargo.

Find the ideal TV size for your room from your viewing distance and resolution. Recommends a screen size in inches, shows a to-scale room diagram with your viewing angle, and checks whether 1080p, 4K or 8K is sharp enough at that distance.

Estimate Twitch streamer earnings from subscriptions, ads, bits, and donations. Compare Affiliate vs Partner revenue splits with detailed breakdowns, growth projections, and monetization tips for streamers at every level.

Count characters for Twitter/X posts with real-time feedback. Shows remaining characters, detects URLs (counted as 23 chars), and handles emoji and CJK character counting accurately.

Convert a Twitter/X post URL or Tweet ID (Snowflake ID) to the exact date and time it was posted. Also converts dates to Snowflake IDs for advanced search filtering on Twitter/X.

Determine whether your vehicle can safely tow a loaded trailer by checking GCWR, curb weight, passenger and cargo weight, trailer weight, tongue weight, optional GVWR, tow rating, and hitch tongue rating.

Calculate front and rear axle weight distribution. Enter the total weight with a balance, or the individual axle weights, to see axle loads, the percentage split, the longitudinal centre of gravity and the likely handling balance.

Generate Voronoi diagrams from seed points. Click to add or drag points, switch between Euclidean, Manhattan, Chebyshev and Minkowski metrics, watch cells animate into place, and export SVG or PNG. Includes Lloyd relaxation.

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.

Compare a new wheel and tire setup against your current one to see how far the wheel pokes toward the fender and tucks toward the suspension. Enter width, offset and tire section width for poke, tuck, backspacing and track-width change.

Generate word ladder puzzles where you turn one word into another by changing a single letter at a time. Includes an interactive play mode, animated step-by-step solutions, difficulty levels and curated example puzzles.

Generate word scramble puzzles from any word list, with interactive letter-tile animations, difficulty levels, hints, a timer mode and printable worksheets - handy for teachers, vocabulary practice and ESL learning.

Create custom word search puzzles from your own word list. Choose a grid size from 8 to 25, difficulty (horizontal, vertical, diagonal, reverse) and colour theme, then solve by click-and-drag or print it with an answer key.

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.

Generate endless would-you-rather questions across funny, deep, superpower, food and family-friendly categories, then vote and see how the community split. Watch an animated tug-of-war, build a streak and write your own dilemmas.

View real-time YouTube channel statistics including subscriber count, total views, video count, average views per video and the channel creation date, with Play Button milestone progress from the official YouTube Data API.

Free online tool to randomly pick comments from any YouTube video. Perfect for giveaways, contests, and selecting winners fairly from video comments.

Estimate YouTube ad revenue for any channel or video based on views, niche CPM, and monetization rate. See daily, monthly, and yearly earnings projections with detailed breakdowns, RPM analysis, and revenue optimization tips.

Estimate potential earnings from YouTube Shorts based on views, niche RPM rates, and the Shorts revenue sharing model. Compare Shorts revenue with long-form video earnings, visualize the revenue flow, and project growth over time.

Free online tool to extract tags and keywords from any YouTube video URL. Analyze video tag strategy, get SEO insights, and copy tags in multiple formats for your own content optimization.

Free online tool to download YouTube video thumbnails in all available resolutions. Paste any YouTube URL or video ID to instantly preview and save HD, SD, and default thumbnail images.

Calculate total watch time for YouTube playlists or video sets. Enter video durations to see total hours and track progress toward the 4,000 watch hour monetization requirement.

Calculate damage per second (DPS) for any weapon loadout. Includes raw DPS, sustained DPS with reload, effective DPS with critical hits, burst damage, and time-to-kill analysis with animated visualizations.

Predict the probability of a snow day based on weather conditions including temperature, snowfall forecast, wind speed, and more. Get a detailed factor-by-factor breakdown of your snow day chances.

Calculate the heat index (apparent temperature) from air temperature and relative humidity using the official NWS Rothfusz formula. Includes danger level assessment, step-by-step calculation, and interactive heat index chart.

Calculate the wind chill temperature from air temperature and wind speed using the official NWS formula. Includes frostbite risk assessment, step-by-step calculation, and interactive wind chill chart.

Enter your game, mouse DPI and sensitivity to convert settings for supported FPS games. Compare the results and the mouse distance for a 360° turn.

Convert real money (USD, EUR, GBP) to in-game currencies for popular games like Fortnite V-Bucks, Roblox Robux, Genshin Impact Primogems, and more. Find the best value packs and compare exchange rates instantly.

Calculate the probability of getting a 5-star or featured character in gacha games like Genshin Impact, Honkai Star Rail, Wuthering Waves, and more. Visualize pity curves and estimate pulls needed.

Calculate your chances of getting rare loot drops over multiple attempts. Visualize probability curves, see expected attempts, and plan your grind with step-by-step math breakdowns for any game.

Calculate the dew point temperature from air temperature and relative humidity using the Magnus formula. Includes comfort assessment, frost point, wet-bulb estimate, step-by-step calculation, and interactive dew point chart.

Free online click counter tool to count clicks, taps, and keystrokes. Features multiple counters, CPS tracking, keyboard shortcuts, sound effects, and full mobile touch support.