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.

Enter who the gift is for, the occasion, a budget, and their interests to get ideas with a reason, a price, and a 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.

Enter days, people, and a calorie target to estimate food weight, a buffer, the meal split, and how pack weight falls each day.

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.

Enter American, decimal, or fractional odds and a stake to see the payout, implied chance, and the vig if you enter both sides.

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.

Enter each ingredient's volume and ABV, then an ice-melt allowance. Get the drink's final alcohol by volume.

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.

Enter your daily cigarette consumption and pack price to see daily, monthly, yearly, and lifetime smoking costs along with potential investment returns.

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.

Enter impressions and clicks to get the click-through rate, compare campaigns and see how many clicks a target rate would need.

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.

Enter what needs washing and the machine size to sort each item into a rack zone, check spray-arm clearance and estimate cycles, water and energy.

Enter both ratings, the match result and a K-factor to get the rating change and expected score, plus the change for a win, a draw and a loss.

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.

Enter bed area, a recommended nutrient rate and the bag's N-P-K percentages. Calculate fertilizer weight and see the nitrogen, phosphate and potash supplied.

Enter two airports, cities, or coordinates to get the great-circle distance, bearing, and a flight time from cruising speed.

Enter your USDA hardiness zone and geographic region to calculate average first and last frost dates, growing season length, and safe planting windows.

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.

Enter distance or odometer readings plus fuel used and fuel price to calculate MPG, L/100km, km/L, total trip cost, and CO2 emissions.

Enter the color-to-developer ratio and a total, the color you have, or your hair length to get each amount and how many tubes to buy.

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.

Estimate your homebrew's ABV from original and final specific gravity. Choose from three formulas and see apparent attenuation and estimated calories per 12 oz.

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.

Enter campaign cost and engagement or conversion counts. See ROI, cost per engagement, earned media value, and a comparison across platforms.

Enter followers, likes, comments, and saves. See the engagement rate and how it compares with benchmarks for that account size.

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.

Search job listings by title, keywords, or company and narrow results by location. Sort by relevance, date, or salary and open listing links.

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.

Search a use such as tarp, loop, or join. See outdoor knots with tying steps, a rope diagram, safety notes, and a comparison table.

Pick a Koch snowflake, Sierpinski, dragon curve, tree, or plant, or write an axiom, rules, and angle. Draw the result for up to eight iterations.

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.

Enter your lawn area, target nitrogen rate, and N-P-K fertilizer analysis to find the required product weight, bag coverage, and total nutrients applied.

Enter house size, wall thickness, and window and door counts, up to 3 floors. See how many 2x4 bricks a life-size house needs, plus weight and estimated cost.

Enter daily hours, bulb count, your rate per kWh, and wattage and price for each type. See energy cost, replacements, and a 10-year payback view.

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.

Enter a number up to 999 trillion and choose cardinal, ordinal, or currency. The result is that amount in English words.

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.

Enter building size or unit count and a use type to estimate parking spaces, including ADA and EV spots and land area.

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.

Enter a URL, text, WiFi login, email, or phone number to make a QR code, set colors and error correction, and download a PNG.

Find quotes by keyword, topic or author and copy the text you want. Create a quote card, adjust its width and download it as a JPG.

Enter length, width, and depth to estimate soil volume, a settling allowance, bag count, and a soil-mix breakdown.

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.

Use recursion up to depth 9, or the chaos game up to 15,000 steps. Color the triangle by depth and export SVG or PNG.

Enter an EN, ISO, or brand temperature label. Get comfort, limit, and extreme readings, adjusted for a cold sleeper, pad R-value, and wet or windy weather.

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.

Search image and video sizes for Instagram, Facebook, X, YouTube, TikTok, LinkedIn, and Pinterest profiles, posts, stories, reels, and ads.

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.

Enter the tent floor dimensions and the undercut per side, in imperial or metric units, to get the footprint size, the DIY cut, and the area covered.

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.

Paste a tire code such as 225/45R17 94V to see the maximum load per tire in kg and lb and the speed rating in km/h and mph.

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

Enter current tread depth and a wear rate, or two depth readings some miles apart, to estimate miles left until the 2/32 inch legal minimum.

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.

Enter your trailer's total weight and tongue weight to check against the safe 10-15% target range and receive cargo adjustment advice.

Enter viewing distance and resolution for a recommended screen size in inches, and whether 1080p, 4K, or 8K stays sharp at that seat.

Enter your streamer tier, viewer count, subscribers, and broadcast hours to estimate monthly Twitch revenue from subs, ads, bits, and donations.

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.

Click or drag seed points, choose Euclidean, Manhattan, Chebyshev, or Minkowski distance, and export SVG or PNG. Lloyd relaxation is included.

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.

Enter wheel width, offset, and tire width to compare wheel setups and measure poke toward the fender, 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.

Enter views and a playback CPM, video RPM, or Shorts RPM for estimated daily, 30-day, and yearly revenue in USD before costs and taxes.

Enter your monthly Shorts views and niche RPM range to estimate expected Shorts revenue and compare potential returns against long-form videos.

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.

Paste a YouTube URL or video ID to preview and save the thumbnail sizes that exist for that video, including HD when it is available.

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.

Enter damage, fire rate, magazine, reload and critical-hit settings to get raw, sustained and effective damage per second, burst damage and time to kill.

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.

Enter air temperature and relative humidity to calculate apparent temperature and shade-level heat danger using the NWS formula.

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.

Enter drop rate percentage, desired items, and up to 1,000,000 attempts to calculate your probability curves and expected attempts.

Enter air temperature and relative humidity to get the dew point by the Magnus formula, plus a comfort note, frost point and wet-bulb estimate.

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.