Free tools that just work
Fast, private calculators and developer tools. Everything runs in your browser: no sign-up, nothing uploaded.
Work hours & pay
- Date CalculatorAdd or subtract days, weeks, months and years to a date, or count the days between two dates.
- Military Time ConverterConvert military (24-hour) time to standard time and back, with a full chart and every hour.
- Overtime CalculatorTime-and-a-half and double-time pay from your hourly rate and hours, weekly or daily rules.
- No Tax on Overtime CalculatorEstimate the 2025-2028 federal deduction for qualified overtime premium pay.
- Time Card CalculatorAdd up weekly hours from your time card or timesheet, with breaks, overtime and pay.
- Time Card Calculator with LunchEnter lunch out and back in, or deduct a fixed lunch in minutes. Handles multiple breaks.
- Biweekly Time Card CalculatorTwo-week time card with overtime counted correctly for each workweek.
- Hours CalculatorHours and minutes between two times, minus breaks. Add up shifts, decimal hours and pay.
- Clock Out Time CalculatorWhat time do I clock out? Clock-in time + hours + lunch, or work back from when you want to leave.
- Time CalculatorAdd or subtract hours, minutes and seconds, or find a time before or after another.
- Time Card TemplateFree weekly and biweekly Excel time card template, with overtime formulas built in.
- Minutes to Decimal ConverterConvert minutes to decimal hours for payroll, with a full 1–59 minute chart.
Pay & pricing
- Pay Raise CalculatorNew pay from a percent, new amount or dollar raise, plus common raises and inflation comparison.
- Discount CalculatorSale price and savings from a price and percent off, stacked discounts, sales tax and quantity.
- Salary to Hourly CalculatorConvert annual salary to hourly pay or back, with hours/week, weeks/year and paid time off.
- Margin CalculatorProfit margin and markup from cost and price, or solve for the price or cost that hits a target margin.
- Markup CalculatorMarkup percentage from cost and price, or the price to charge for a target markup (cost-plus pricing).
Selling & marketing
- CPM CalculatorCost per 1,000 impressions (CPM), or solve for ad spend or impressions instead.
- UTM BuilderAdd utm_source, utm_medium and utm_campaign to any link, with presets and a link history.
- eBay Fee CalculatorFinal value fee, per-order fee, net payout and profit from your sold price (US).
- PayPal Fee CalculatorFee on money received, or the amount to ask for so you net a target amount (US).
- CBM CalculatorCubic meters, cubic feet, volumetric weight (air/courier/sea) and container fill.
- ROAS CalculatorReturn on ad spend from revenue and cost, plus break-even ROAS from your margin.
- CTR CalculatorClick-through rate from impressions and clicks, or solve for clicks or impressions.
- CPC CalculatorCost per click from ad spend and clicks, plus CPA (cost per acquisition).
Home & garden
- Concrete CalculatorCubic yards, cubic feet and bags for slabs, footings, columns and steps, plus a truck estimate.
- Square Footage CalculatorAdd up rooms and shapes, subtract cut-outs, enter feet and inches: sq ft, sq yd, sq m, acres.
- Gravel CalculatorCubic yards, tons and bags of gravel for driveways, paths and patios, plus cost.
- Mulch CalculatorCubic yards and bags of mulch for garden beds, bulk or bagged, any shape.
- Topsoil CalculatorCubic yards, tons and bags of soil for lawns, raised beds and leveling.
- Sand CalculatorCubic yards, tons and bags of sand for pavers, play sand and leveling.
Auto
- Tire Size CalculatorTire diameter, width, sidewall and revs per mile for any size, plus equivalent sizes.
- Tire Size ComparisonCompare two tire sizes side by side: height, width, ride height and speedometer error.
- Speedometer CalculatorYour real speed after bigger or smaller tires, or a gear ratio change.
- Wheel Offset CalculatorHow far new wheels poke out or tuck in, inner clearance, and offset to backspacing.
- Gas Trip CalculatorFuel cost of a road trip or commute from distance, MPG and gas price, split per person.
Developer tools
- JSON Formatter & ValidatorFormat, beautify or minify JSON and find errors by line and column. Runs in your browser.
- JSON ViewerExplore JSON as a collapsible tree, filter keys and values, and copy the path to any node.
- JSON CompareCompare two JSON files: added, removed and changed values with paths. Ignores key order.
- HTML Formatter & BeautifierPretty print, minify, lowercase tags or wrap attributes. Preserves script, style and pre.
- SQL Formatter & BeautifierFormat or minify SQL for MySQL, PostgreSQL, T-SQL, SQLite, BigQuery and more. Nothing uploaded.
- Diff CheckerCompare two texts or files: line, word and character-level highlights, side by side or inline.
- XML Formatter & ValidatorPretty print, minify and validate XML. Comments, CDATA and attribute order are kept exactly.
- HTML ViewerPaste HTML and see it rendered live in a sandboxed preview. Scripts off by default.
- JSON to CSV ConverterConvert JSON to CSV: nested objects flatten to columns, comma/semicolon/tab, opens in Excel.
- CSV to JSON ConverterTurn CSV rows into JSON objects. Detects the delimiter, numbers and true/false.
- JSON to YAML ConverterConvert JSON to clean 2-space YAML for Kubernetes, Compose and CI configs.
- YAML to JSON ConverterConvert YAML to JSON, with anchors, multi-document files and exact error lines.
- JSON to XML ConverterBuild indented XML from JSON: keys to elements, arrays repeat, @_ keys to attributes.
- XML to JSON ConverterConvert XML to JSON with attributes, repeated elements as arrays, CDATA and namespaces.
- Base64 DecodeDecode Base64 to text, or to an image, PDF or file. UTF-8, URL-safe and data URIs.
- Base64 EncodeEncode text, images and files to Base64 or a data URI, with URL-safe and wrap options.
- URL DecodeDecode percent-encoded text and URLs, with every query parameter listed.
- URL EncodePercent-encode text or URLs: encodeURIComponent, encodeURI or form (+ for spaces).
- JWT DecoderDecode a JSON Web Token, see when it expires and verify its signature, all in your browser.
- Hash GeneratorMD5, SHA-1, SHA-256, SHA-384, SHA-512 and HMAC for text or a file, plus checksum compare.
- JSON to TypeScript ConverterGenerate TypeScript interfaces or types from JSON: optional properties, unions, null, plus Zod.
- Cron Expression GeneratorBuild or paste a cron schedule for a plain-English description, next run times and snippets.
- Unix Timestamp ConverterEpoch converter: current Unix time, timestamp to date and back, in seconds or ms, any time zone.
- Regex TesterTest JavaScript regex with live highlighting, named groups, replace preview and a cheat sheet.
- Subnet CalculatorIPv4/IPv6 subnet and CIDR calculator: network, broadcast, hosts, VLSM splits, cheat sheet.
- Chmod CalculatorLinux permissions: checkboxes ↔ octal ↔ symbolic ↔ chmod command, with setuid/setgid/sticky.
- UUID GeneratorGenerate v4, v7, v1, v5 or v3 UUIDs (GUIDs), bulk up to 1,000, any format. Runs in your browser.
- Lorem Ipsum GeneratorParagraphs, sentences, words, list items or exact bytes of Lorem Ipsum, plain or HTML.