A unit converter app maker lets you build a converter that has the units you use and none of the ones you don't. Describe the categories, the layout and any special units, the AI agent writes the app, you try conversions in the emulator preview and download it as an Android APK. Cooks, travelers, students and tradespeople each end up with a very different app.
What your unit converter app will have
From the idea above, the agent builds:
- Category grid — Length, Weight, Temperature, Area, Volume, Speed, Time, Data and Cooking, each with a clear icon.
- Converter screen — a number field, From and To unit pickers, a swap button and the result updating as you type.
- All units at once — below the main result, the same value in every other unit of that category.
- Favorites — pin the conversions you use most, like kilometers to miles, to the top of the home screen.
- Recent conversions — the last few values you converted, one tap to reopen.
- Settings — decimal places, number format and a default unit system.
Everything runs on the phone, so the app opens instantly and works offline, which matters most when you are traveling.
Features you can ask for
- A currency converter with rates you type in settings and a "last updated" date on screen.
- Cooking conversions that know a cup of flour and a cup of sugar weigh different amounts.
- Shoe and clothing size charts for US, UK and EU sizes.
- Fractions for inches, like 5/16, next to decimals.
- A search box that jumps to any unit by name.
- Copy a result with a long press, or share it.
- Local units you define yourself, such as a regional land or weight measure.
Ideas to make it yours
The guide to building a calculator or converter app explains how to state formulas and rounding so the numbers are right the first time. Making a converter for a class? The school project guide shows how to present it, and the quiz app maker can turn the same units into a practice quiz.
Get it on your phone
- Press Build this unit converter app and sign in with Google.
- Try a few conversions in the emulator preview, including temperature and a very large number.
- Ask for changes in plain words: "put Temperature first", "show 4 decimals", "add nautical miles".
- Press Download APK and install it on your Android phone.
- To publish on Google Play, build the signed APK and AAB from the same menu; the APK builder page explains the steps.
Temperature is the conversion most apps get wrong, because it is not a simple multiplication. Check that 100 °C shows 212 °F and that −40 is the same on both scales.
Tips for accurate conversions
Most units have exact definitions: an inch is exactly 2.54 centimeters and a pound is exactly 0.45359237 kilograms. Ask the agent to use exact factors and to round only the number it shows, never the number it calculates with. Be clear about ambiguous units: a US gallon and a UK gallon differ, and so do US and UK tons, so ask for both with clear labels. For cooking, volume-to-weight conversions depend on the ingredient, so keep a small table you can edit. And if your converter includes currency, show the date of the rate next to every result, so nobody mistakes an old rate for today's.
Frequently asked
Can the converter handle currency?
Yes, with rates you enter in settings along with a 'last updated' date. Rates built into the app go stale within days, so editable rates keep the results honest.
How accurate are the conversions?
The agent uses the standard definitions, such as 1 inch = 2.54 cm exactly, and keeps full precision until the result is shown. Check a few values you know; if one differs, paste the expected number and the agent corrects it.
Can I add my own units?
Yes. Name the unit and how it relates to a known one, for example a local land measure in square feet, and the agent adds it to the right category.
Does the unit converter work offline?
Yes. All conversions run on the phone, so it works without internet and opens instantly.
Make your unit converter app now — free to start
Describe it, sign in, and the agent builds it while you watch. Change anything by asking.
Build this unit converter app ›