# Practical Tools

> A collection of 12 fast, browser-based calculators and utilities. No signup, no installation, no tracking. Each tool runs entirely client-side in JavaScript and works offline once loaded. English pages live at clean root URLs (e.g. `/bmi-calculator`); Chinese versions live under `/zh/` (e.g. `/zh/bmi-calculator`). Legacy `?lang=en` URLs redirect to the English clean URLs.

## Calculators

- [Discount Calculator](https://getpracticaltools.com/discount-calculator): Compute final price after a percentage discount. Supports stacked discounts, currency display, and "X% off when you buy Y" rules.
- [BMI Calculator](https://getpracticaltools.com/bmi-calculator): Calculate Body Mass Index from height and weight using the WHO standard formula. Shows BMI category (underweight, normal, overweight, obese) and the healthy weight range for a given height.
- [Date Countdown](https://getpracticaltools.com/countdown): Count days, hours, minutes, and seconds until or since any date. Useful for deadlines, anniversaries, and project milestones.
- [Lunar Calendar](https://getpracticaltools.com/lunar-calendar): Convert between Gregorian (solar) and Chinese lunar (农历) calendars. Shows lunar dates, zodiac year, and traditional festivals.
- [Unit Converter](https://getpracticaltools.com/unit-converter): Convert between common units of length, weight, temperature, area, volume, and time.
- [Sleep Calculator](https://getpracticaltools.com/sleep-calculator): Pick the ideal bedtime or wake-up time based on 90-minute sleep cycles, so you fall asleep and wake up feeling rested.

## Generators & Formatters

- [QR Code Generator](https://getpracticaltools.com/qr-code-generator): Generate QR codes for URLs, text, contact cards (vCard), and Wi-Fi credentials. Download as PNG.
- [Invoice Generator](https://getpracticaltools.com/invoice-generator): Create simple invoices with line items, tax, and totals. Print or save as PDF.
- [JSON Formatter](https://getpracticaltools.com/json-formatter): Pretty-print, validate, and minify JSON. Highlights syntax errors with line numbers.
- [Password Generator](https://getpracticaltools.com/password-generator): Generate strong, random passwords in your browser with configurable length and character sets. Nothing is uploaded.

## File & Text Utilities

- [HEIC to JPG](https://getpracticaltools.com/heic-to-jpg): Convert Apple HEIC photos to JPG in the browser. Files never leave your device.
- [Word Counter](https://getpracticaltools.com/word-counter): Count words, characters, sentences, paragraphs, and estimated reading time for any text.

## About

- [About Practical Tools](https://getpracticaltools.com/about): Mission, technology stack, and contact information.

## Optional

- [Sitemap](https://getpracticaltools.com/sitemap.xml): Full XML sitemap of all tools and pages.
- [RSS Feed](https://getpracticaltools.com/rss.xml): Updates when new tools are added.