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Publishing Tools KDP Royalty Calculator Estimate your Amazon KDP royalty for eBooks, paperbacks and hardcovers. Crypto & Currency BTC to Sats Converter Convert between Bitcoin, mBTC, bits and satoshis. Crypto & Currency Loss Recovery Calculator How much you need to gain back to break even after a loss. Crypto & Currency DCA Calculator Project what a regular investment could grow to over time. Percentages & Math Percentage Calculator Percent of a value, proportions, change and increase/decrease. Money & Shopping Discount Calculator What you actually pay after a discount. Money & Shopping Tip Calculator Split the bill and work out the tip. Money & Shopping Electricity Cost Calculator What a device costs you per year. Date & Time Age Calculator Your exact age in years, months and days. Date & Time Date Calculator Days between two dates, or add/subtract days. Date & Time Time Duration Calculator Hours and minutes between two times. Date & Time Work Hours Calculator Total hours worked across a week. Converters & Random Unit Converter Length, weight, temperature and more. Converters & Random Random Number Generator Pick a number in any range. Finance Compound Interest Calculator What a starting amount plus monthly contributions could grow to. Finance Loan / Mortgage Calculator Monthly payment and total interest for a fixed-rate loan. Finance Savings Goal Calculator How much to save each month to reach a target amount. Finance VAT Calculator Add VAT to a net price, or extract it from a gross price. Health BMI Calculator Body Mass Index from your height and weight. Health Calorie / BMR Calculator Your basal metabolic rate and estimated daily calorie needs. Text & Dev Tools Word & Character Counter Live word count, character count and reading time. Text & Dev Tools Case Converter UPPERCASE, lowercase, Title Case or Sentence case. Text & Dev Tools Password Generator A random password, generated securely in your browser. Text & Dev Tools Color Converter Convert between HEX, RGB and HSL color codes. Text & Dev Tools QR Code Generator Turn any text or URL into a QR code, right in your browser. Health Body Fat Calculator Estimate body fat percentage using the U.S. Navy method. Health Pregnancy Due Date Calculator Estimated due date and current week of pregnancy. Health Water Intake Calculator A daily water target based on your weight and exercise. Health Heart Rate Zone Calculator Target heart rate zones for training, from your age. Text & Dev Tools Base64 Encoder / Decoder Encode text to Base64, or decode it back. Text & Dev Tools URL Encoder / Decoder Percent-encode text for safe use in a URL, or decode it back. Text & Dev Tools JSON Formatter / Validator Pretty-print or minify JSON, and check it's valid. Text & Dev Tools Lorem Ipsum Generator Placeholder text for mockups and layouts. Text & Dev Tools Hash Generator SHA-1, SHA-256 and SHA-512 hashes of any text. Text & Dev Tools Number Base Converter Convert between decimal, binary, hex and octal. Date & Time Time Zone Converter Convert a time between fixed UTC offsets. Date & Time Business Days Calculator Count weekdays between two dates, or add/subtract business days. Date & Time Week Number Calculator The ISO week number for any date. Finance Markup / Margin Calculator Work out a selling price from your cost. Finance ROI Calculator Return on investment, plus an annualized rate. Finance Simple Interest Calculator Interest that doesn't compound. Finance Fuel Cost Calculator What a trip costs in fuel. Converters & Random Roman Numeral Converter Numbers to Roman numerals, and back. Converters & Random Data Storage Converter Convert between bits, bytes, KB, MB, GB and TB. Converters & Random Random List Picker Pick a random item from your own list.