About Unit Master
Unit Master is a free, lightning-fast unit converter designed for everyday use, students, engineers, cooks, and travelers. With 50+ precision conversion tools across 12 categories — including Length, Weight (now with Stone), Temperature, Speed, Volume, Area (including Acres), Time, Data, Cooking, Fuel & Pressure, Energy, Number Bases, Angles, and Roman Numerals — everything runs directly in your browser with no installation, no account, and no data sent to any server. Unit Master works offline as a Progressive Web App (PWA) so you can install it on your phone or desktop and use it without an internet connection.
Live Currency Exchange
Unit Master includes a real-time multi-currency exchange dashboard covering 20 global currencies: USD, EUR, GBP, JPY, CAD, AUD, CHF, CNY, INR, MXN, BRL, KRW, SGD, HKD, NOK, SEK, NZD, ZAR, AED, and THB. Rates are fetched from a live, open exchange rate API and update automatically every hour. Simply type an amount in any currency field and all others update instantly. If the API is unavailable, a built-in set of fallback rates ensures the converter always works.
How to Use Unit Master
Using Unit Master is simple. Select a category tab at the top (e.g., Length, Weight, or Currency). Each card shows two input fields — type a value into either field and the other updates automatically in real time. For currency, type any amount in any currency row and all 20 currencies update instantly. Use keyboard shortcuts 1 through 8 to jump between tabs instantly. Tap the 📸 Snap button on any card to copy a screenshot of that conversion to your clipboard for sharing.
Frequently Asked Questions
How do I convert miles to kilometers?
Click the Temp & Speed tab (tab 3) or directly use the Length tab. Enter your miles value in the Miles field and the kilometers value will update instantly. The formula is: 1 mile = 1.60934 kilometers. So 10 miles = 16.09 km.
How do I convert Celsius to Fahrenheit?
Open the Temp & Speed tab and enter your Celsius value. The Fahrenheit result appears immediately. The formula is: °F = (°C × 9/5) + 32. For example, 100°C = 212°F (boiling point of water).
How do I convert pounds to kilograms?
Click the Weight tab and type your value in the Pounds field. The kilogram equivalent updates in real time. The exact conversion is: 1 pound = 0.453592 kilograms. So 150 lbs = 68.04 kg.
How accurate are the currency exchange rates?
Unit Master fetches live exchange rates from a public currency API updated daily. Rates reflect mid-market values and are suitable for reference and travel planning. For large financial transactions, always consult your bank or a licensed financial service for official rates.
Does Unit Master work offline?
Yes! Unit Master is a Progressive Web App (PWA). You can install it to your home screen on Android or iOS, and it will work fully offline for all unit conversions. The live currency tab requires an internet connection to fetch the latest rates, but falls back to built-in reference rates when offline.
How do I convert gallons to liters?
Open the Volume tab and enter the number of gallons. The liter result appears instantly. 1 US gallon = 3.78541 liters. For example, a 20-gallon tank holds approximately 75.7 liters.
How do I convert MPG to L/100km?
Go to the Fuel & Pressure tab and enter your MPG value. The L/100km equivalent updates automatically. The formula is: L/100km = 235.215 ÷ MPG. So 30 MPG ≈ 7.84 L/100km — a common fuel economy benchmark.
Can I share a conversion result?
Yes — tap the 📸 Snap button in the top-right corner of any conversion card. This captures a clean screenshot of that card and copies it to your clipboard (or saves it to your device on mobile), ready to share via messages, social media, or email.
How do I convert stone to kilograms?
Select the Weight tab. Enter your value in the Stone field. 1 stone = 6.35029 kg. For example, 11 stone is approximately 69.85 kg. This is a common weight unit in the UK and Ireland.
How do I convert degrees to radians?
Open the Angles tab (tab 11). Enter your degrees value. The formula is: radians = degrees × (π / 180). So 180° is exactly π (approx 3.14159) radians.
Does it support Roman Numerals?
Yes! Our Roman tab (tab 12) allows you to convert standard decimal numbers (up to 3999) into classical Roman numerals and vice versa. Just type in either field to see the conversion instantly.
Popular Conversion Reference
Quick-reference values for the most frequently searched unit conversions:
| Convert From | Convert To | Result |
|---|---|---|
| 1 Mile | Kilometers | 1.609 km |
| 1 Kilogram | Pounds | 2.205 lb |
| 100°F | Celsius | 37.78°C |
| 1 US Gallon | Liters | 3.785 L |
| 1 Inch | Centimeters | 2.54 cm |
| 1 Foot | Meters | 0.3048 m |
| 30 MPG | L/100km | 7.84 L/100km |
| 1 kWh | Joules | 3,600,000 J |
| 1 Ounce | Grams | 28.35 g |
| 1 Stone | Kilograms | 6.350 kg |
| 180° | Radians | 3.141 rad |
| 2024 | Roman | MMXXIV |
| 1 Acre | Square Meters | 4,046.86 m² |
| 255 | Hex | 0xFF |
| 1 Liter | US Cups | 4.227 cups |
| 1 km/h | mph | 0.621 mph |
| 1 HP | kW | 0.746 kW |
| 1 Bar | PSI | 14.504 psi |
| 1 Gram | Ounces | 0.035 oz |
| 1 Meter | Yards | 1.094 yd |
Unit Master Use Cases
🍳 For Chefs & Home Cooks
Never get stuck with a recipe again. Convert cups to milliliters, tablespoons to teaspoons, and even sticks of butter to grams. Our Cooking tab is designed for high precision in the kitchen.
✈️ For International Travelers
Driving in a new country? Convert km/h to mph or Celsius to Fahrenheit in seconds. Use the Currency tab to check the latest exchange rates before you spend.
📐 For Engineering & Science
Professional-grade tools for technical work. Convert Radians to Degrees, Kilowatts to Horsepower, and PSI to Bar. The Numbers tab supports Binary, Hex, and Octal for programmers.
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