Discover a wide range of powerful online calculators designed to simplify complex computations. Streamline your calculations with our intuitive tools.
Screen Size Comparison Calculator Compare two screens side by side at true physical scale. Enter a diagonal size and pixel resolution for each display and instantly see the accurate scaled visual, PPI (pixels per inch), pixel pitch, viewing area, aspect ratio and density category for both screens — together with a plain-language summary of which ...
Try the Tool »Stair Rise & Run Calculator Design a code-compliant staircase from a total floor-to-floor rise and an optional total run. The calculator picks the optimal step count, computes each riser height and tread depth, and flags whether the result passes IRC residential or IBC commercial limits. It also draws a side-view SVG diagram and reports the ...
Try the Tool »LLM API Cost Calculator Estimate what an LLM API call will actually cost before you deploy it. Enter the input tokens, output tokens, and your daily call volume, pick a model, and this tool shows you the per-call, per-day, per-month, and per-year spend across OpenAI, Anthropic, Google, and Meta models — using the current published ...
Try the Tool »Paint Coverage Calculator Figure out exactly how much paint to buy before you head to the hardware store. The Paint Coverage Calculator turns your room dimensions into the number of litres or gallons you need and the exact number of cans to buy, with standard deductions for doors and windows, multi-coat support, and a waste ...
Try the Tool »CRC Checksum Calculator Compute Cyclic Redundancy Check values instantly for text or file input, choosing from 15 standardized variants across the CRC-8, CRC-16, CRC-32, and CRC-64 families. Verify downloads, validate serial protocol frames, or confirm file integrity without uploading anything — all calculations run locally in your browser. How to Use Type or paste text ...
Try the Tool »LLM Token Count Estimator Paste any prompt, document, or snippet of code and instantly see an estimated token count for GPT-4o, GPT-4 Turbo, GPT-3.5, the o1 reasoning models, Claude 3.x, and Gemini 1.5. The tool runs fully in the browser, updates in real time as you type, and pairs the count with cost figures per ...
Try the Tool »Semver Version Calculator & Range Tester An all-in-one Semantic Versioning (SemVer 2.0.0) workbench for developers. Validate version strings, compare two versions with strict precedence, test whether a version satisfies an npm/Composer-style range expression (^, ~, x, hyphen, ||, comparison operators), bump a version with major/minor/patch/prerelease increments, and sort large lists of versions with full pre-release ...
Try the Tool »Sales Tax & VAT Calculator Instantly calculate sales tax and VAT on any price. Enter an amount and tax rate to see the pre-tax price, tax amount, and total. The calculator supports both adding tax to a price and removing tax from a tax-inclusive total (reverse VAT), making it useful for invoicing, receipt verification, and ...
Try the Tool »BMR & TDEE Calorie Calculator Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using scientifically validated formulas. Whether you are planning a calorie deficit for weight loss or a surplus for muscle gain, this calculator gives you the precise numbers you need to reach your goals. How to Use Enter your ...
Try the Tool »Date Countdown Calculator The Date Countdown Calculator lets you create a real-time countdown to any future date or event. Watch the days, hours, minutes, and seconds tick away live on screen. You can also see how much time has passed since a past event, count only working days (excluding weekends), and share your countdown with ...
Try the Tool »CSS Specificity Calculator The CSS Specificity Calculator helps you determine the exact specificity score of any CSS selector. Understanding specificity is crucial for debugging CSS conflicts and writing maintainable stylesheets. Enter one or more selectors and instantly see their (a,b,c) scores compared side by side. How to Use Enter one CSS selector per line in ...
Try the Tool »Working Hours & Overtime Calculator Track your daily work hours, calculate overtime, and estimate gross pay with this free online timesheet calculator. Whether you are a freelancer, shift worker, or manager reviewing timesheets, this tool handles break deductions, configurable overtime thresholds, and multiple overtime multipliers so you get accurate results every time. How to Use ...
Try the Tool »Resistor Color Code Calculator Quickly decode resistor color bands to find resistance values, or enter a resistance value to find the correct color band combination. This calculator supports both 4-band and 5-band resistors and displays an interactive visual diagram with real-time results. How to Use Select whether you have a 4-band or 5-band resistor from ...
Try the Tool »Electricity Cost Calculator Quickly estimate how much electricity any device or appliance costs you per day, week, month, and year. Enter the wattage, usage hours, and your electricity rate to get instant cost breakdowns and CO₂ emission estimates. How to Use Enter your device wattage in watts (check the label on your appliance or its ...
Try the Tool »Reading Time Calculator Quickly estimate how long it will take to read any text, whether silently or aloud. This free online reading time calculator analyzes your text and provides accurate time estimates based on adjustable words-per-minute (WPM) speeds, along with word and character counts. How to Use Paste your text into the input area or ...
Try the Tool »Side Hustle Income Tax Calculator Estimate your federal taxes on side hustle and gig income with this free calculator. Whether you drive for a rideshare service, freelance on weekends, or sell products online, understanding your tax obligations is essential. This tool calculates self-employment tax (Social Security and Medicare), federal income tax using 2025 brackets, and ...
Try the Tool »1099 vs W2 Income Comparison Calculator Compare your true take-home pay between working as a 1099 independent contractor and a W2 employee. This calculator accounts for self-employment tax, FICA contributions, health insurance costs, retirement contributions, business deductions, and employer benefits to give you an accurate side-by-side comparison. How to Use Enter your annual gross income ...
Try the Tool »Date Calculator The Date Calculator lets you quickly find a future or past date by adding or subtracting days, months, and years from any starting date. Whether you are planning deadlines, calculating due dates, or figuring out milestones, this tool gives you instant results with detailed information about the resulting date. How to Use Select ...
Try the Tool »Hours Calculator Quickly calculate the number of hours and minutes between any two times. Whether you’re tracking work hours, planning schedules, or calculating shift durations, this tool gives you an instant, accurate result. How to Use 1. Enter a Start Time using the time picker or by typing in HH:MM format.2. Enter an End Time ...
Try the Tool »Age Calculator Calculate your exact age down to the day with the Age Calculator. Enter your date of birth and instantly see a complete breakdown of your age in years, months, days, weeks, and hours. Whether you need it for official documents, curiosity, or planning, this tool gives you precise results in seconds. How to ...
Try the Tool »Add IO tools to your favorite browser for instant access and faster searching
Scoreboard is a fun way to keep track of your games, all data is stored in your browser. More features are coming soon!
Update: Our latest tool was added on Jun 2, 2026
Help us continue providing valuable free tools
