UnitMaster: Unit Converter

UnitMaster is a fast, beautiful, and 100% offline unit converter for everyday and professional use. Convert length, weight, temperature, area, volume, time, speed, and data — all in a single tap, with no clutter and no internet required.
WHY UNITMASTER

• Lightning fast — results update live as you type, no Convert button to hit.
• Beautifully minimal — a clean dark interface designed to stay out of your way.
• Truly offline — every conversion runs on your device. No account, no login, no tracking of your inputs.
• Tiny and efficient — under 10 MB, instant launch, no battery drain.
• Free forever — supported by unobtrusive ads.

CONVERSION CATEGORIES

📏 Length — millimeter, centimeter, meter, kilometer, inch, foot, yard, mile, nautical mile
⚖️ Weight / Mass — milligram, gram, kilogram, metric ton, ounce, pound, stone
🌡️ Temperature — Celsius, Fahrenheit, Kelvin
📐 Area — square millimeter through square mile, plus acre and hectare
🧊 Volume — milliliter, liter, cubic meter, teaspoon, tablespoon, fluid ounce, cup, pint, quart, US gallon, UK gallon
⏱️ Time — millisecond, second, minute, hour, day, week, month, year
🚀 Speed — meter / second, kilometer / hour, mile / hour, foot / second, knot
💾 Data — bit, byte, kilobyte, megabyte, gigabyte, terabyte

WHAT YOU CAN DO

• Pick from 8 conversion categories on a clean home grid.
• Live conversion that updates as you type — no need to hit a button.
• Swap the FROM and TO units with a single tap.
• Copy the result to your clipboard instantly.
• Switch between Dark and Light themes from Settings.
• Read your privacy policy directly inside the app.

POPULAR CONVERSIONS

kg to lbs, lbs to kg, cm to inches, inches to cm, °C to °F, °F to °C, km to miles, miles to km, liters to gallons, gallons to liters, MB to GB, kph to mph, mph to kph, °C to K, ft to m, m to ft, oz to grams, grams to oz.

PRIVACY-FIRST DESIGN

UnitMaster never collects your conversions, history, or personal information. Settings are stored only on your device. Ads are served by Google AdMob; you control personalization on first launch and from Settings → Manage ad consent.

Built by an independent developer who believes utilities should be fast, free, and respectful of your privacy.

Made with care. Have feedback? Tap Settings → Send feedback.