A professional unit converter for Android — 15 categories, 130+ units, physical constants reference.
Free · Open source · No ads · No telemetry
| Feature | Details | |
|---|---|---|
| 🔄 | Live conversion | Results update instantly as you type |
| 📚 | 15 categories | 130+ units — from meters to light years |
| 🌡️ | Smart temperature | Exact °C / °F / K / °R formulas, not naive factors |
| 🔬 | Physical constants | 14 fundamental constants — tap to copy |
| 🔍 | Professional picker | Bottom-sheet unit list with factors & search-style layout |
| ⚖️ | One-tap swap | Flip from/to instantly with haptic feedback |
| 🧮 | Formula display | See the exact math behind every conversion |
| 📋 | Copy & share | Send results to clipboard or any app |
| 🎨 | 3 themes | Dark · Light · AMOLED — animated 400ms transitions |
| 📱 | 100% offline | No network, no tracking, no accounts |
| Category | Units |
|---|---|
| Length | Meter, Kilometer, Centimeter, Millimeter, Micrometer, Nanometer, Mile, Yard, Foot, Inch, Nautical Mile, Light Year, Parsec, AU |
| Mass | Kilogram, Gram, Milligram, Microgram, Metric Ton, Pound, Ounce, Stone, US Ton, Imperial Ton, Atomic Mass Unit, Carat, Grain, Troy Ounce, Slug |
| Temperature | Celsius, Fahrenheit, Kelvin, Rankine |
| Time | Nanosecond, Microsecond, Millisecond, Second, Minute, Hour, Day, Week, Month, Year, Decade, Century |
| Speed | m/s, km/h, mph, Knot, ft/s, Mach, Speed of Light |
| Area | m², km², cm², mm², µm², Hectare, Acre, Are, Barn, ft², in², mi², yd² |
| Volume | Liter, Milliliter, Cubic Meter, Gallon (US/UK), Quart, Pint, Cup, Fl Oz, Tablespoon, Teaspoon, Cubic Foot, Cubic Inch |
| Data | Bit, Byte, KB, MB, GB, TB, PB, KiB, MiB, GiB |
| Energy | Joule, Kilojoule, Megajoule, Gigajoule, Calorie, Kilocalorie, Watt-hour, Kilowatt-hour, eV, BTU, Foot-pound, Erg, Therm |
| Pressure | Pascal, Kilopascal, Megapascal, Bar, Atmosphere, psi, mmHg, Torr |
| Frequency | Hz, kHz, MHz, GHz, THz, RPM |
| Angle | Degree, Radian, Gradian, Arc Minute, Arc Second, Turn |
| Power | Watt, Kilowatt, Megawatt, Horsepower, Metric Horsepower, BTU/h, Erg/s, Foot-pound/min |
| Torque | Newton-meter, Kilonewton-meter, Foot-pound, Inch-pound, Dyne-meter, Kilogram-force Meter |
| Fuel Economy | km/L, mi/L, m/L, mpg (US), mpg (UK) |
Constants included: c · h · G · k_B · e · m_e · m_p · N_A · R · g · M⊕ · R⊕ · eV · u
lib/
├── core/
│ ├── app_colors.dart # Navy + amber design tokens
│ └── unit_data.dart # 15 categories, conversions, constants
├── screens/
│ ├── converter_screen.dart # Main UI + bottom-sheet unit picker
│ ├── constants_screen.dart # Physical constants reference
│ ├── history_screen.dart # Persisted conversion history
│ └── settings_screen.dart # Themes, links, about
└── main.dart # Theme switching (AnimatedTheme)
- State: lightweight —
setState+InheritedWidget(ThemeUpdater) - Persistence:
shared_preferences - Sharing:
share_plus - Links:
url_launcher - No heavy frameworks — the whole app builds in seconds
git clone https://github.com/CR3-Architect/UnitPro.git
cd UnitPro
flutter pub get
flutter test # 15 tests
flutter build apk --release --split-per-abiOutput: build/app/outputs/flutter-apk/app-arm64-v8a-release.apk
flutter test15 tests covering real conversions (inch→cm, °C→°F, GB→MB…), result formatting edge cases (integers, decimals, scientific notation), and widget rendering.
CalcPro Studio — scientific calculator with 9 modes: standard, scientific, programmer, matrix, calculus, base-n, equations, graphs, and yes — a unit converter too.
⭐ Star the repo if you find it useful