Best Unit Converter Apps for Android
Quick honesty check before the list: three apps that popular guides still recommend no longer exist on the Play Store. Unit Converter Ultimate, Unit Converter PRO by Aevumsoft, and Equate have all been removed. We verified each one live on October 4, 2026. Do not waste time searching for them or installing shady copies.
Also honest: for one-off conversions, you may not need an app at all. Type "convert 5 miles to km" into Google Search and you get an interactive converter with live currency rates, no install needed. Apps earn their place when you convert often, need offline access, or want history and favorites. Every app below was verified live on the Play Store on October 4, 2026.
Quick picks
| App | Rating | Price | Best for |
|---|---|---|---|
| Unit Converter (DIGIT GROVE) | 4.5 (190K) | Free + ads/IAP | Best all-round |
| ClevCalc | 4.6 (1.22M) | Free + ads/IAP | Calculator + converter |
| All-In-One Calculator | 4.5 (170K) | Free + ads/IAP | Editors' Choice combo |
| XE | 4.6 (401K) | Free + ads | Currency specialist |
| Convert Units | 4.7 (1.35K) | Free, clean labels | No-frills, no ads shown |
1. Unit Converter by DIGIT GROVE — best all-round
Unit Converter by DIGIT GROVE is the most popular dedicated converter on Android: 4.5 stars from 190K reviews, 10M+ downloads, updated October 3, 2026. Free, with ads and in-app purchases on its listing.
It covers 87 unit categories — length, weight, temperature, volume, speed, pressure, energy, data storage, cooking, fuel consumption, and more — plus live currency conversion, financial calculators, and math tools. The interface was rebuilt with a modern design and themes, and conversions update as you type.
The honest catch, from recent user reviews: the app has been pushing a monthly subscription, with some users reporting that features they once had are now paywalled and ads have gotten aggressive. It remains the most complete free converter, but go in with eyes open — if the subscription prompts annoy you, the next picks are calmer.
2. ClevCalc — best calculator + converter combo
ClevCalc by Cleveni Inc. is the giant of this list: 4.6 stars from 1.22 million reviews, 100M+ downloads, updated September 23, 2026. Free, with ads and in-app purchases.
It is a full calculator first — general, scientific, financial, health — with unit conversion built in: 135+ currencies, length, weight, temperature, and the common categories, plus a world time converter. If you want one app that handles math homework, currency on a trip, and quick conversions, this replaces two or three apps.
It will not match DIGIT GROVE on sheer category count. But for everyday use, the combination of an excellent calculator with solid conversion is hard to beat, and 1.22 million reviews do not lie.
3. All-In-One Calculator — Editors' Choice combo
All-In-One Calculator by allinonecalculator.com carries Google's Editors' Choice badge: 4.5 stars from 170K reviews, 10M+ downloads, updated August 11, 2026. Free, with ads and in-app purchases.
Like ClevCalc, it combines calculator functions with unit and currency conversion — 160 currencies, measurement conversions, cooking conversions, and academic math tools. The developers offer a single one-time payment for the full version instead of a subscription, which is refreshingly old-fashioned.
If you dislike subscriptions on principle, this is your pick over DIGIT GROVE: pay once, own it, done.
4. XE — best currency specialist
Xe Money Transfer & Currency by XE.com Inc. is the currency expert: 4.6 stars from 401K reviews, 10M+ downloads, updated October 1, 2026. Free with ads, and notably no in-app purchases label.
It handles 180+ currencies with live exchange rates, rate alerts when a currency hits your target, historical charts, and offline mode with cached rates. It has been the trusted name in currency conversion for over two decades.
It only does money — no length, weight, or temperature. But if your conversions are mostly currency while traveling or shopping internationally, a specialist beats a generalist. Pair it with any app above for measurements.
5. Convert Units — simplest, no-frills
Convert Units by Defiant Technologies is the quiet pick: 4.7 stars, 100K+ downloads, updated July 20, 2025. Free, and its Play listing shows neither ads nor in-app purchase labels.
It does one thing: convert units, with a simple interface and no clutter. The honest caveat is scale — 1.35K reviews is tiny next to the giants above, so there is less community proof. But if you want a converter that just converts, with no ads labels and no subscription machinery, this is worth a look.
Apps that vanished from the Play Store
We checked; they are gone. Do not install APKs claiming to be them:
- Unit Converter Ultimate (physphil): The open-source favorite recommended by half the internet. Official listing returns "not found"; only a copycat remains.
- Unit Converter PRO (Aevumsoft): The paid, ad-free, 2000-unit powerhouse. No Aevumsoft listing exists anymore.
- Equate: The free converter with an inflation calculator. Removed; no official listing found.
What to check before installing
Converter apps look identical in screenshots. These four checks separate the good ones:
- Offline support. Measurements never need internet, but some apps still demand it for ads or analytics. If you travel, confirm the core converter works in airplane mode.
- Currency rate freshness. Free apps update rates anywhere from hourly to daily. For travel spending it hardly matters; for business, check the timestamp the app shows.
- Ad behavior. Converter apps are used in quick bursts — open, convert, close. Full-screen ads between those bursts get annoying fast, which is exactly what recent DIGIT GROVE reviews complain about.
- Subscription vs one-time. Some converters now push monthly plans for what used to be free. All-In-One Calculator's one-time payment is the friendlier model if you hate subscriptions.
Currency conversion: the fine print
Two things nobody tells you about currency apps. First, the rate you see is the mid-market rate — banks and exchange shops give you a worse one, so the app's number is a reference, not a promise. Second, "live" rates are only as live as the app's update cycle; XE and similar apps refresh regularly, but a rate cached yesterday can be off after a volatile day.
For travelers, the practical setup is simple: XE for checking rates before you exchange, and your measurement app for everything else. Download or cache rates before you leave Wi-Fi, because airport and roaming data make every lookup expensive.
Cooking conversions deserve their own note
Kitchen conversions trip people up more than any other kind, because cups and grams do not convert neatly — a cup of flour and a cup of sugar weigh different amounts. A good converter app handles volume-to-weight for common ingredients, but the real fix is a $10 kitchen scale. Until then, look for an app with a dedicated cooking category (DIGIT GROVE and All-In-One Calculator both have one) and double-check Fahrenheit-to-Celsius on your oven, since oven dials are often off by 10 degrees anyway.
Do you even need a converter app?
Be honest with yourself before installing:
- Once in a while: Google Search handles it. "Convert 5 miles to km" or "100 USD to PKR" gives instant answers with live rates.
- Traveling: XE for currency plus any measurement app above. Offline mode matters when data is expensive.
- Studying or engineering: A dedicated app with history and favorites saves real time over retyping searches.
- Cooking: Cups to milliliters, Fahrenheit to Celsius — a widget or a simple app beats a flour-covered phone screen of search results.
The verdict
For most people: Unit Converter by DIGIT GROVE for everything, XE for serious currency use, and ClevCalc if you also want a great calculator. Prefer one-time payment over subscriptions? All-In-One Calculator. Want it minimal? Convert Units. And whatever old guides say, Unit Converter Ultimate, Aevumsoft's PRO, and Equate are gone — install the living apps instead.
One last tip: the best converter is the one you actually open. Put it on your home screen or in your quick settings if your launcher allows it. A converter buried three folders deep might as well not exist when you are standing in a market doing mental math.
Frequently asked questions
What is the best unit converter app for Android?
Unit Converter by DIGIT GROVE (4.5 stars, 190K reviews, 10M+ downloads) is the most popular all-round pick. For currency, XE is the specialist at 4.6 stars with 401K reviews.
Do unit converter apps work offline?
Yes for measurements — length, weight, temperature and the rest need no internet. Currency conversion needs live rates, though most apps cache recent rates for offline use.
Is Unit Converter Ultimate still available?
No. Unit Converter Ultimate by physphil has been removed from the Google Play Store. Many guides still recommend it, but you cannot install the official app anymore.
Can I convert units without installing an app?
Yes. Type something like "convert 5 miles to km" into Google Search and you get an interactive converter with live currency rates — no install needed, though it requires internet.
Are free unit converter apps accurate?
Yes. They use standard conversion formulas. Currency converters pull live exchange rates; for measurements the math is fixed and identical across apps.