Free online calculators for developers and business. Margin calculators, salary converters, date calculators, word counters, and more. Fast, accurate, and private.
Calculate profit margins, markups, and pricing
Calculate the true cost of meetings with live timer
Convert between annual salary and hourly rate
Calculate days between dates or add/subtract time
Analyze text readability with Flesch-Kincaid and more
Convert between bytes, KB, MB, GB, TB, and PB
Convert between seconds, minutes, hours, days, weeks, and years
Calculate percentages, find what percent, and percentage change
Calculate exact age in years, months, and days from birthdate
Calculate tip amount and split bill among people
Calculate discounted price and savings from percentage off
Convert numbers to words and words to numbers
Count characters, bytes, words, lines, and paragraphs
Count words, characters, sentences, and more
Convert between binary, octal, decimal, and hex
Count tokens for GPT, Claude, Llama with cost estimates
Convert Unix file permissions between symbolic and octal formats
Calculate IP subnet information, network addresses, and usable host ranges
From calculating profit margins and meeting costs to counting words and converting between number bases, our calculators handle the math so you can focus on decisions.
Instant Results: All calculations happen in real-time as you type. No submit buttons, no waiting - just immediate answers.
Developer & Business: Whether you're a developer working with number systems or a business professional analyzing margins, we have tools for both.