Any unit.
Instantly.
Unit Tools
A fast, simple unit converter with live currency rates, size charts for shoes and clothing, and traditional Chinese units.
Free, with a small banner ad. An optional subscription removes it.
- Price
- Free
- Category
- Education
- Requires
- iOS 18.0+
- Size
- 22.6 MB
Built for quick answers
- Eight categories
- 7-day currency trends
- Shoe and clothing sizes
- History and favorites
Live rates with a 7-day trend
Convert currencies with live exchange rates and see how a pair moved over the last 7 days. Tap any point to see the date and rate. Rates are for reference only.
Sizes, sorted
Look up shoe and clothing sizes across regions before you buy.
Traditional Chinese units
Convert cun, chi, zhang, jin, and more alongside metric and imperial.
Area, instantly
Enter a length and a width, and the Length × Width calculator gives you the area in the unit you pick.
Light or dark
Pick the theme that suits you, and use the app in English or Chinese.
From one unit
to the one you need.
- 1
Pick a category
Length, weight, temperature, currency, and more.
- 2
Enter a value
See the result as you type.
- 3
Swap or change units
Flip the direction in one tap.
- 4
Save it
Star a conversion, or find it later in History.
Every conversion, one app.
The units you reach for every day, and a few you won't find elsewhere.
Eight categories
Length, weight, temperature, currency, speed, data, cooking, and area.
Live currency rates
Live exchange rates with a 7-day trend chart for each pair. Rates are for reference only.
Size charts
Shoe and clothing sizes across regions, side by side.
Traditional Chinese units
Cun, chi, zhang, jin, and more, next to metric and imperial.
History and favorites
Look back at past conversions, keep the ones you use most, and choose how many decimal places to show.
Light and dark themes
Switch themes any time, in English or Chinese. No account needed.
Q&A
Is Unit Tools free?
Yes. Unit Tools is free and shows a small banner ad. An optional auto-renewing monthly subscription, Unit Tools Remove Ads, removes the banner ad. It does not add other features. The App Store shows the price before you confirm. It renews automatically unless you cancel at least 24 hours before the end of the period. You can manage or cancel it in your Apple Account settings, and Restore Purchases in the app turns ad removal back on after a reinstall or on a new device.
Where do the currency rates come from?
Unit Tools loads live exchange rates from public exchange-rate services. Rates are for reference only, so check with your bank or card issuer before you pay.
Do I need an account?
No. Your settings, favorites, and conversion history stay on your device.
Which devices and languages are supported?
Unit Tools runs on iPhone and iPad with iOS 18 or later, in English and Chinese.
Where can I get help?
Visit the support page below, or use the feedback form on our homepage.
Convert anything, anywhere.
Download Unit Tools and get the answer in a tap.