In today's fast-paced world, whether you're a student solving math problems, an engineer calculating technical specifications, a traveler converting currencies, or a chef adjusting recipe measurements, having a reliable all-in-one converter and calculator app is essential.
Unit Converter & Calculator is a comprehensive Android application that combines 54 conversion categories with 800+ units, 18 financial calculators, 16 math solvers, and 34 utility tools - all working offline with support for 11 languages and both light and dark themes.
Unit Converter & Calculator - Your Everyday Utility Hub
📊 Quick Stats
15,100+
Downloads
4.7★
Average Rating
122+
Total Features
📚 Complete Guide Series
This is Part 1 of 3 in our comprehensive Unit Converter guide series:
- Part 1: Getting Started (You are here) - Basic conversions, currency, customization
- Part 2: Math & Finance Calculators - 34 professional calculators
- Part 3: Utility Tools & Advanced Features - Sensor tools, FAQs, tips
🎯 What is Unit Converter & Calculator?
Unit Converter & Calculator is a feature-rich Android application designed to be your one-stop utility hub for everyday conversions, calculations, and measurements. Unlike single-purpose apps, it combines multiple tools into one seamless interface.
Core Capabilities
- 🔄 54 Conversion Categories - From basic length/weight to specialized magnetic flux and kinematic viscosity
- 💰 18 Financial Calculators - EMI, mortgage, ROI, depreciation, and more
- 🧮 16 Math Calculators - Prime numbers, Fibonacci, area, volume, equation solvers
- 🛠️ 34 Utility Tools - BMI, compass, speedometer, metal detector, password generator
- 💱 180+ Currencies - Real-time exchange rates with offline caching
- 🌍 11 Languages - Full localization with RTL support for Arabic
- 🎨 Theme Options - Light, dark, and system default themes
- 📶 Offline Functionality - All features work offline (except live currency updates)
📦 What You'll Learn in This Guide
- How to perform unit conversions across 54 categories
- Converting currencies with live exchange rates
- Customizing the app with themes and languages
- Using the favorites system for quick access
- Understanding offline vs online features
🔄 Unit Converter - 54 Categories with 800+ Units
The heart of the app is its comprehensive unit conversion system covering 54 different categories.
Popular Conversion Categories
| Category | Total Units | Example Units |
|---|---|---|
| Currency | 180+ | USD, EUR, INR, GBP, JPY, CNY |
| Length | 22 | Meter, Kilometer, Mile, Foot, Inch |
| Storage | 40 | Bit, Byte, KB, MB, GB, TB, PB |
| Weight | 29 | Gram, Kilogram, Pound, Ounce, Ton |
| Area | 40 | Square meter, Acre, Hectare |
| Temperature | 8 | Celsius, Fahrenheit, Kelvin, Rankine |
| Time | 32 | Second, Minute, Hour, Day, Week, Year |
| Speed | 31 | km/h, mph, knot, Mach |
| Volume | 76 | Liter, Gallon, Cubic meter, Milliliter |
| Pressure | 52 | Pascal, Bar, PSI, Atmosphere |
Specialized Engineering & Scientific Conversions
The app goes beyond basic conversions to support professional and scientific needs:
| Category | Units | Professional Use |
|---|---|---|
| Energy | 58 | Engineers, Physicists |
| Dynamic Viscosity | 29 | Chemical Engineers |
| Magnetic Flux | 13 | Electrical Engineers |
| Flow Rate | 58 | Mechanical Engineers |
| Electric Charge | 17 | Electronics Engineers |
| Number Systems | 39 bases | Programmers, CS Students |
How to Perform Unit Conversions
Step 1: Select a Conversion Category
- Launch Unit Converter & Calculator
- On the home screen, you'll see the Units tab (default view)
- Browse through 54 categories organized by type
- Tap on your desired category (e.g., Storage, Temperature, Currency)
Step 2: Enter the Value to Convert
- Tap on the top input field to select the "From" unit
- Use the custom numeric keypad at the bottom to enter your value
- The keypad includes:
- Numbers 0-9
- Decimal point
- Clear (×) button
- Delete/backspace
Step 3: Select Units and View Results
- Tap the dropdown next to the input to choose the "From" unit
- Tap the bottom dropdown to select the "To" unit
- Result appears instantly as you type - real-time calculation
- Use the blue swap button (🔄) to reverse the conversion direction
Step 4: Switch Between Grid and List View
- Tap the grid icon (⊞) in the top-right for compact grid view
- Tap the list icon (☰) for detailed list view with unit abbreviations
Step 5: Add to Favorites (Optional)
- Tap the heart icon (❤️) in the top-right corner
- This saves the conversion category to your Favorites for quick access
- Access favorites from the bottom navigation bar
💱 Currency Converter - 180+ World Currencies with Live Rates
The Currency Converter is one of the most popular features, offering real-time exchange rates for over 180 currencies.
Key Features
- 🌍 180+ Currencies - All major and minor world currencies
- 📡 Live Exchange Rates - Real-time updates via API
- ⚙️ Background Auto-Update - WorkManager updates rates periodically
- 💾 Offline Caching - Works offline with last known rates
- 📅 Rate Timestamp - Shows last update time (e.g., "31 Mar 2025, 17:30:01")
- 🔍 Currency Search - Quick search by name or ISO code
- ⭐ Favorite Currencies - Bookmark frequently used currencies
- 🎌 Country Flags - Visual identification with flag icons
How to Convert Currency
Step 1: Open Currency Converter
- Tap on the Units tab in the bottom navigation
- Scroll to find Currency (usually at the top)
- Tap to open the currency converter
Step 2: Select Currencies
- Tap the top dropdown to select the "From" currency
- Browse the list with country flags (e.g., 🇬🇧 South Georgia - SHP)
- Tap the bottom dropdown for the "To" currency (e.g., 🇹🇳 Tunisia - TND)
- Use the search icon (🔍) to quickly find currencies
Step 3: Enter Amount
- Tap on the top input field
- Use the custom numeric keypad to enter the amount (e.g., 85)
- The result appears instantly below (e.g., 342.281)
Step 4: View Exchange Rate Details
- At the bottom, you'll see the current rate with timestamp:
- Example:
Rate: 1 SHP = 4.027 TND On 31 Mar 2025, 17:30:01
- Example:
- This shows when the rate was last updated
Step 5: Swap Currencies
- Tap the blue circular swap button (🔄) to instantly reverse the conversion
- The "From" and "To" currencies exchange positions
Step 6: Add to Favorites
- Tap the heart icon (❤️) to save this currency pair
- Access your favorite currency conversions quickly from the favorites list
Converting 85 SHP to 342.281 TND with Live Exchange Rates
Understanding Online vs Offline Mode
- ✅ Offline Mode: Currency converter works with cached rates from the last update
- 📶 Online Mode: Rates update automatically when connected to the internet
- ⚠️ Important: For critical financial decisions, always verify rates are current by checking the timestamp
🎨 Customization & Settings
Theme Options
Unit Converter & Calculator offers 3 theme modes:
- 🌞 Light Mode - Traditional bright theme for daytime use
- 🌙 Dark Mode - AMOLED-friendly dark theme for:
- Reduced eye strain at night
- Battery savings on OLED screens
- Better readability in low-light conditions
- ⚙️ System Default - Automatically follows your device's theme settings
How to Change Theme:
- Tap the Settings icon (⚙️) in the top-right corner
- Select Theme
- Choose Light, Dark, or System Default
- Change applies instantly - no restart required
Light and Dark Mode - Convert Units with Ease, Day or Night
Language Support
The app supports 11 languages with full localization:
- 🇺🇸 English (Default)
- 🇸🇦 Arabic (with RTL support)
- 🇩🇪 German
- 🇮🇹 Italian
- 🇯🇵 Japanese
- 🇰🇷 Korean
- 🇧🇷 Portuguese (Brazilian)
- 🇷🇺 Russian
- 🇪🇸 Spanish
- 🇺🇦 Ukrainian
RTL (Right-to-Left) Support:
- Arabic language gets full RTL layout support
- Menus, text, and navigation automatically reverse
- Ensures native reading experience for Arabic users
How to Change Language:
- Open Settings (⚙️)
- Tap Language
- Select your preferred language
- The entire app interface updates immediately
Number Formatting Options
Customize how numbers are displayed:
Format Types:
- General - Standard (e.g., 1000000)
- Thousand Separator - Grouped (e.g., 1,000,000)
- Scientific Notation - Exponential (e.g., 1E+6)
Decimal Settings:
- Decimal Separator: Dot (.) or Comma (,) based on locale
- Decimal Places: Adjustable 0-10 decimal places with slider
How to Configure:
- Go to Settings → Number Format
- Select format type
- Adjust decimal places with the slider
- Choose decimal separator (dot/comma)
⭐ Favorites System
The Favorites feature lets you bookmark frequently used conversions, calculators, and tools for instant access.
How to Use Favorites
Adding to Favorites:
- Open any conversion category, calculator, or tool
- Tap the heart icon (❤️) in the top-right corner
- The item is instantly added to your favorites list
- The heart icon fills in to show it's favorited
Accessing Favorites:
- Tap the Favorites icon in the bottom navigation bar
- View all your bookmarked items organized by category:
- Units (conversion categories)
- Maths (calculators)
- Finance (financial tools)
- Tools (utility tools)
- Tap any item to open it directly
Managing Favorites:
- Open the Favorites list
- Long-press on any item to:
- Remove from favorites
- Reorder items (drag and drop)
- Use the search function to filter through favorites
Benefits:
- ⚡ Quick Access - Skip browsing through categories
- 🎯 Personalized - Create your own custom dashboard
- 💾 Persistent - Favorites are saved locally (Room database)
- 🔄 Synced - Remains across app restarts
🎯 Next Steps
Now that you've mastered the basics, explore the advanced features:
Continue Reading:
- Part 2: Math & Finance Calculators - 18 financial tools + 16 math calculators
- Part 3: Utility Tools & Advanced Features - Compass, metal detector, sound meter, FAQs
Download Now
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Start your conversion journey with Unit Converter & Calculator - master the basics in Part 1, then explore advanced calculators and utility tools in Parts 2 and 3.
