# One Converter: Unit Calculator — US Measurement & Converter Pro > Offline unit and measurement converter for iOS with extensive conversion options. (iPhone/iPad app by Novvio, Inc..) - Source: https://appshunter.io/ios/app/one-converter-unit-calculator/id1357652887 (this page in markdown: same URL + `.md`) - Developer: [Novvio, Inc.](https://appshunter.io/developer/1357247399) - Category: Utilities, Business - Price: Free with in-app purchases - Rating: 2.00/5 from 7 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 14.0 · 15 MB - Languages: American English - Released: 2018-03-11 - Data updated: 2026-08-05 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/one-converter-unit-calculator/id1357652887/reviews.md ## What is One Converter? The best measurement, unit, metric converter app for iOS! Unit conversion tool that you may need in your daily life, in your lessons, and at work. With a simple, useful interface, you can convert any unit you want to another unit and use it in your calculations. All you have to do is enter the category and choose the units to convert the amount. It's that simple! You can easily convert commonly used units with our unit conversion tool. This app a universal unit converter and measure tool that can convert units of different categories. - Length Converter: Angstrom, Astronomic Unit, Centimeter, Chain, Fathom, Feet, Furlong, Inch, Kilometer, Light Year, Meter, Mile, Millimeter, Nautical Mile, Parsec, Yard - Velocity (Speed) Converter: Centimeters Per Hour / Per Minute / Per Second, Feet Per Hour / Per Minute / Per Second, Furlongs Per Fortnight, Inches Per Hour / Per Minute / Per Second, Kilometers Per Hour / Per Minute / Per Second, Knots, Light, March, Meters Per Hour / Per Minute / Per Second, Miles Per Hour / Per Minute / Per Second - Temperature Converter: Celsius, Fahrenheit, Kelvin, Rankine Raumur - Mass (Weight) Converter: Atomic Mass Unit, Drachm, Dram, Firkin, Grain, Gram, Hundred Weight, Kilogram, Milligram, Pennyweight, Quarter, Scruple, Short Hundredweight, Short Ton, Slug, Stone, Tonne, Troy Ounce, Troy Pound, UK Ton, US Ounce, US Pound - Volume (Capacity) Converter: Centiliters, Coffee Spon, Cubic Centimeter, Cubic Decimeter, Cubic Feet, Cubic Inch, Cubic Kilometer, Cubic Meter, Cubic Mile, Cubic Millimeter, Cubic Yard, Cup, Dashes, Deciliter, Drachm, Dram, Drop, Dry Barrel, Gallon, Liquid Barrel, Liter, Millimeter, Pinche, Tablespoon, Teaspoon, UK Bushel, UK Fluid Ounce, UK Gallon, UK Gill, UK Minim, UK Peck, UK Pint, UK Quart, US Bushel, US Fluid Ounce, US Gill, US Liquid Quard, US Minim, US Peck - Angle Converter: Circle, Degree, Gon, Grade, Mil, Minute, Nautical Rhumb, Quadrant, Radian, Revolution, Second, Turn - Energy Converter: BTU, Calorie, Electron Volt, Ergs, Foot Pound Force, Joule, Kilogram Force Meter, Kilowatt Hour, Newton Meter, Therm, Watt Hour - Time Converter: Blink, Century, Cesium133, Day, Decade, Fortnight, Hour, Lunar Year, Microfortnight, Microsecond, Millenia, Minute, Millisecond, Month, Nanosecond, Second, Sidereal Day, Sidereal Hour, Sidereal Minute, Sidereal Second, Sidereal Week, Sidereal Year, Tick, Week, Year - Area Converter: Acre, Barn, Hectare, Rood, Square Centimeter, Square Decimeter, Square Feet, Square Inch, Square Meter, Square Millimeter, Square Rod, Square Yard, Square Mile - Computer Data Converter - Female Shoe Size Converter - Male Shoe Size Converter - Speed Converter - Power Converter It is now effortless to translate between thousands of measurement units. Unit Converter works entirely offline without the need for an internet connection. A measurement conversion tool is here to make your life easier. Download now for free. ## Key features - Extensive unit conversion categories - Simple and useful interface - Offline functionality - Supports thousands of units - Daily life, lessons, and work utility - Metric and US measurement support ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Unit & Metric Converter Plus | $1.99 | one-time | | Unit Converter & Calculator | $3.99 | one-time | | Measurement Unit Converter Pro | $4.99 | one-time | | Unit Conversion Calculator Pro | $5.99 | one-time | | Unit & Metric Converter Plus | $4.99 | one-time | ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/one-converter-unit-calculator/id1357652887/reviews.md ### 1/5 — Advertising *2025-02-20, version 2.13* Hey team, why there is still always advertisements after regular purchase? Please fix it. Thank you. ### 1/5 — WTF *2023-09-07, version 2.13* I’ve just bought this app, because without must watching video (30s) every click. So now it's only 5s video and share data remains on although 5 times was set off. Favourite option don't work. Want my money back or make it all work.... ### 4/5 — Nice app. *2021-06-11* Nice app. Would have given 5 stars but there is no way to enter a negative number for temperatures. I haven’t checked all categories, but assume you can’t enter a negative number under any category. ### 2/5 — Temperature in Mass section *2020-11-04* Used this App pretty often before the last update. Now they have crazy problem and it’s not possible to convert mass measures as they have temperature measures in this section. **Developer response:** Hello, Sorry for the problems with our app. We work to provide the best app experience for you. Could you reach us via hello@appack.io? We want to listen to your issues. ### 1/5 — Really? *2020-09-18* I haven’t written a review good or bad for anything in years but, I gotta say, this is the worst thing I’ve ever seen. If you attempt to even try to convert any measurement, it goes right to add’s when you select which type of measurement you want and when it brings you back to see the results no changes are made and whatever you typed in has disappeared. So if anyone made money off of this app, then they are legit some very horrible people. I wouldn’t use it if I was paid to..... unless they pay a lot👍 **Developer response:** We are really upset that you are dissatisfied with the app. Please tell us what can be improved to change your opinion? ### 1/5 — Inaccurate *2020-08-26* 350 degrees Farenheit converts to 10.3 degrees Celcius. What utter rubbish Then pelts you with adds to twist the knife Even the sample sceenshots show incorrect conversions☹️ **Developer response:** We've identified this issue and other conversion issues. We will fix them in next releases. Thank you for your comment. ### 1/5 — Not good *2019-02-19* It either works or it doesn’t. This one has been incorrect for me. Don’t bother. **Developer response:** Hello! Thank you for your feedback! Could you please clarify what exactly you didn’t like about the app? ### 1/5 — Doesn’t work *2018-09-14* First conversion I did from kg to US pounds was wrong **Developer response:** We are really upset that you are dissatisfied with the app. Please tell us what can be improved to change your opinion? ### 1/5 — Don’t install it *2018-06-28* This app is showing 1US oz is 290 grams, which is not right. Also it doesn’t let you enter the decimal Value like 0.1 US oz to gm **Developer response:** Hello! Thank you for your feedback! Could you please clarify what exactly you didn’t like about the app? ## Frequently asked questions about One Converter ### What units can One Converter convert? One Converter supports a vast array of units across categories like Length, Velocity, Temperature, Mass, Volume, Angle, Energy, Time, Area, Computer Data, Shoe Sizes, Speed, and Power. It includes common and specialized units for diverse needs. ### Does One Converter work offline? Yes, One Converter works entirely offline, meaning you do not need an internet connection to perform any unit conversions. This makes it a reliable tool for use anywhere. ### Is One Converter free to use? One Converter is available for free download and use. It does contain advertisements and offers in-app purchases, which may provide additional features or remove ads. ### What is the rating for One Converter? One Converter has a rating of 2.0 stars based on 7 user ratings. This indicates a mixed reception from its current user base. ### On which devices can I use One Converter? One Converter is supported on iPhone, iPad, and iPod devices. It is designed for the iOS platform. ### How often is One Converter updated? The latest version of One Converter is 2.13, which was last updated on January 28, 2023. This suggests updates are released periodically. ### What is the age rating for One Converter? One Converter has an age rating of 4+, meaning it is suitable for users aged four and older. This indicates it contains no mature content. ### Does One Converter have ads? Yes, One Converter contains advertisements. These ads are present to support the free version of the application. ## Version history (last 5 releases) ### 2.13 — 2023-01-28 Thank you for using One Converter. We regularly update our app to make it better for you. Please install the latest version for all features and improvements we offer you. New features on this version: - Performance functions updated. - Converter crash solved. ### 2.12 — 2021-11-05 Thank you for using Unit Converter: Measure Calc. We regularly update our app to make it better for you. Please install the latest version for all features and improvements we offer you. New features on this version: - Performance functions updated. - Converter crash solved. ### 2.11 — 2021-09-16 Thank you for using Unit Converter: Measure Calc. We regularly update our app to make it better for you. Please install the latest version for all features and improvements we offer you. New features on this version: - Performance functions updated. - Converter crash solved. ### 2.10 — 2021-06-08 Thank you for using Unit Converter: Measure Calc. We regularly update our app to make it better for you. Please install the latest version for all features and improvements we offer you. New features on this version: - Performance functions updated. - Converter crash solved. ### 2.09 — 2021-05-31 Thank you for using Unit Converter: Measure Calc. We regularly update our app to make it better for you. Please install the latest version for all features and improvements we offer you. New features on this version: - Performance functions updated. - Converter crash solved. ## Apps similar to One Converter | App | Rating | Price | Category | | --- | --- | --- | --- | | [Calculator +](https://appshunter.io/ios/app/calculator-plus/id351815470) | 4.6 (9,595) | Free | Utilities | | [Unit Converter and Calculator.](https://appshunter.io/ios/app/unit-converter-and-calculator/id1559358634) | 4.2 (80) | Free | Utilities | | [Calculator SC-323PU](https://appshunter.io/ios/app/calculator-sc-323pu/id301290196) | 4.7 (118) | $3.99 | Utilities | | [Calculator #](https://appshunter.io/ios/app/calculator/id458535080) | 4.6 (35,862) | Free | Utilities | | [Calculator₊](https://appshunter.io/ios/app/calculator/id398129933) | 4.7 (1,725,212) | Free | Utilities | | [Unit of measurement converter](https://appshunter.io/ios/app/unit-of-measurement-converter/id1377754425) | 4.7 (372) | Free | Utilities | ## More apps by Novvio, Inc. - [Loan Calculator－Installment +](https://appshunter.io/ios/app/loan-calculatorinstallment-plus/id1347158046) - [Powerscanner: QR Code Scanner](https://appshunter.io/ios/app/powerscanner-qr-code-scanner/id1363573318) - [QR Hero－Easy QR Code Scanner](https://appshunter.io/ios/app/qr-heroeasy-qr-code-scanner/id1400061772) - [Pie: Sleep Sounds White Noise](https://appshunter.io/ios/app/pie-sleep-sounds-white-noise/id1438113877) - [Waller: HD Live Wallpaper](https://appshunter.io/ios/app/waller-hd-live-wallpaper/id1453988132) All apps by Novvio, Inc.: https://appshunter.io/developer/1357247399 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-05.*