Calculators & Converters

Calculate your exact age in years, months, and days from your date of birth. Free online age calculator — instant results in your browser.

Calculate your Body Mass Index (BMI) instantly. Supports metric and imperial units. Free online BMI calculator — no signup required.

Calculate monthly EMI, total interest, and total payment for any loan. Free online loan calculator with amortization breakdown.

Calculate percentages, percentage increase/decrease, and what percentage one number is of another. Free online percentage calculator.

Unix Timestamp Converter — Convert between Unix timestamps and human-readable dates instantly. See the current epoch time and convert any timestamp to a...

Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly. Free online temperature converter — no signup required.

Convert any number to words instantly. Supports large numbers up to trillions. Free online number to words converter.

Roman Numerals Converter — Convert between numbers and Roman numerals instantly. Enter a number (1-3999) or a Roman numeral to see the conversion.

Format numbers with commas, decimals, currency symbols, and more. Free online number formatter with multiple locale support.

Stopwatch & Timer — Use a precision stopwatch with lap tracking or set a countdown timer — all in your browser with no downloads needed.

Credit Card Validator — Validate credit card numbers using the Luhn algorithm. Identify the card type (Visa, Mastercard, Amex, Discover) and check if th...

Hex Converter — Convert numbers between hexadecimal, decimal, octal, and binary formats. Enter a value in any base and see all conversions instantly.

Food Macros Calculator — Determine your optimal daily calorie requirements and macronutrient breakdown for fat loss, maintenance, or muscle gain.

Micros & Vitamins Calculator — Check recommended daily allowances (RDAs) for major vitamins and minerals tailored to your age, biological gender, and li...

Training Volume Calculator — Log your exercises and sets to calculate your weekly workout volume load per muscle group and compare it against muscle-bui...

Free online scientific calculator with sin, cos, tan, log, factorial, powers, and parentheses. Supports degrees/radians and keyboard input.

Calculate the exact difference between two dates in years, months, days, total weeks, and hours. Optional end-day inclusion and weekday count.

Calculate compound interest with optional monthly contributions. See final balance, total interest, and a year-by-year breakdown table instantly.

Calculate your cumulative GPA on the 4.0 scale. Add courses with grade and credit hours, remove rows, and see your GPA update live.

Display live current time in multiple time zones at once. Add any IANA time zone, see local time, date, and UTC offset updated every second.

Count down to a specific date and time or run a simple H:M:S duration timer. Optional beep and browser notification when time runs out.

A configurable Pomodoro productivity timer with work, short break, and long break phases. Progress ring, beep alerts, and round tracking included.

Free discount calculator. Enter a price and percent off to instantly see how much you save and the final sale price. Works fully in your browser.

Free profit margin calculator. Enter cost and selling price to get profit, profit margin %, and markup %. Instant, private, runs in your browser.

Free sales tax / VAT calculator. Add tax to a net price or extract tax from a tax-inclusive total. Shows net, tax amount, and gross. Runs in your browser.

Calculate PayPal fees and the amount you receive, or gross-up to receive an exact net. Editable percent + fixed fee. Private, runs in your browser.

Free average calculator. Paste numbers to get the mean, median, mode, sum, min, max, and range instantly. No upload — runs entirely in your browser.

Calculate tips and split bills instantly in your browser. Free, no sign-up—just enter the amount, tip %, and number of people.

Calculate your monthly loan EMI, total interest, and total repayment right in your browser. Free, no sign-up required.

Split any group bill fairly in your browser—add tax, tip, and divide among any number of people. Free, no sign-up needed.

Get ISO week number for any date. Week start/end, Hijri date beside Gregorian, day of year, mini calendar. Monday, Sunday, or Saturday week starts.

Calculate GLP-1 medication doses — click calculator for Mounjaro, Ozempic, Wegovy. Micro-dose and titration plans. Consult your doctor.

Free online timezone meeting planner. No signup, no upload — works entirely in your browser. Fast, private, and free forever.

Calculate UAE end-of-service gratuity per Federal Decree-Law No. 33 of 2021. Input basic salary, years of service, contract type, and termination reason.

Select your streaming services and find the best bundle deals. Compare Netflix, Disney+, Prime Video, Max, Hulu, Apple TV+ and more. Calculate monthly savings.

Calculate pH, pOH, H+ and OH- concentrations from hydrogen ion concentration or pH value. Includes interactive pH scale visualization with color coding.

Calculate serial dilution concentrations step by step. Enter stock concentration, dilution factor, and number of steps. Visual bar chart and detailed table output.

Convert annual or monthly salary to hourly, daily, weekly rates. Includes optional tax rate for pre and post-tax comparisons. Multiple currency support.

Calculate ROI percentage, annualized ROI, CAGR, and net gain from initial investment and final value. Visual bar chart comparison and step-by-step breakdown.

Compare API costs across OpenAI, Anthropic, Google Gemini, and other AI models. Calculate per-request and monthly expenses for your AI applications.

Count tokens in your text and estimate AI API costs for OpenAI, Anthropic, and Google models. Free online token counter with cost projections.

Estimate fine-tuning costs for OpenAI, Anthropic, and other AI models. Calculate training token costs and compare providers.

Simulate costs for multi-step AI agent workflows. Estimate expenses for chains of API calls including tool use, retries, and planning steps.

Should you use ChatGPT Plus, Claude Pro, or the API? Calculate the break-even point where API pay-per-token becomes cheaper than a subscription.

Calculate embedding generation and vector database costs for RAG applications. Compare OpenAI, Cohere, and other embedding model pricing.

Estimate token costs for AI vision APIs. Calculate how many tokens images consume in GPT-4o, Claude, and Gemini vision models.

Compare GPU pricing across AWS, GCP, Azure, and Lambda Cloud for AI training and inference. Calculate hourly and monthly costs.

Calculate the cost per AI chatbot conversation. Estimate monthly expenses based on messages per conversation, token usage, and conversation volume.

Project your AI API spending over 24 months with growth rate modeling. Forecast costs with linear, exponential, and seasonal growth patterns.

Calculate the ROI of AI automation. Compare AI implementation costs against labor savings, efficiency gains, and revenue impact.

Plan your AI context window usage. Allocate token budgets between system prompts, conversation history, documents, and model output.

Compare AI model benchmarks side by side. MMLU, HumanEval, GSM8K, HellaSwag, and more for GPT-4o, Claude, Gemini, Llama, and Mistral.

Check if your AI API usage is within rate limits. Calculate requests per minute, tokens per minute, and tier limits for OpenAI, Anthropic, and more.

Calculate dataset size requirements for AI fine-tuning. Estimate token counts, storage needs, and training costs from your data.

Build effective AI system prompts and templates. Generate structured prompts with role, context, constraints, and output format for any use case.

Check text readability with Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, and SMOG scores. Grade level analysis for any text.

Comprehensive glossary of 40+ AI and machine learning terms. Clear explanations of LLM, RAG, fine-tuning, embeddings, transformers, and more.

Calculate the real cost of meetings by entering attendee salaries and meeting duration. See how much your meetings really cost.

Break down your AI prompt into components and estimate tokens for each part. See system prompt, user message, and context token counts separately.