# BabelUnits — Simple Scientific Calculator > Scientific calculator and extensive unit converter with accessibility features. (iPhone/iPad app by Michael Ryan.) - Source: https://appshunter.io/ios/app/babelunits/id1564971200 (this page in markdown: same URL + `.md`) - Developer: [Michael Ryan](https://appshunter.io/developer/1564971202) - Category: Reference, Education - Price: $0.29 - Rating: 5.00/5 from 2 App Store ratings - Age rating: 4+ - Requires: iOS 13.5 · 4 MB - Languages: English - Released: 2021-05-11 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/babelunits/id1564971200/reviews.md ## What is BabelUnits? BabelUnits Calculator is a simple to use and elegant unit conversion and reference calculator. With a description to help one understand every unit. Now with accessibility for the visually impaired. The calculator and units are now VoiceOver capable. With VoiceOver activated each button, each unit, the number fields, and each action all have audio descriptions in English and haptic cues. It includes a powerful calculator with natural logarithms, natural exponents, logarithms with any base, exponents of any real number. Memory buffer with M+ and M- functions. Statistical entries with mean, median, and standard deviations with and without bias. Trigonometric functions and their inverses for sine, cos, and tangent and their corresponding hyperbolic functions and their inverses. In addition to the more common conversions, BabelUnits includes many fun and point-of-reference conversions: find your weight on Mars, compare heights with the Eiffel Tower or the Burj Khalifa, or compare a vehicle's speed compared to a jet's Mach index or the speed of light. Even sports units! With 35 different conversion categories and thousands of units, BabelUnits provides a complete solution for any engineer, student, professional, archivist, or just curious individual that needs an instant conversion. International units are included as well. Common units from Australia, China, Egypt, Germany, Japan, India, Korea, Scotland, Cyrillic, the United Kingdom, and the United States can be found in all categories. Even archaic units from ancient Rome, ancient Israel, or the Egyptian kingdoms can be used. BabelUnits is ad free! And... we do not collect your information at all. Use BabelUnits with peace of mind knowing that nothing is happening to your precious personal info. BabelUnits's current conversion categories are: Angle (planar and solid),   Area,  Area (Basic), Area (Real Estate), Bolt Sizes, Charge,  Construction (Lengths), Construction (Volumes), Cooking (Mass), Cooking (Volume), Current (Electrical), Density (mass per volume) Distance,  Distance (Astronomy), Distance (Basic), Distance (Fun), Distance (Sports), Energy,  Energy (Batteries), Flow (Volumetric),  Flow (Mass), Force,  Frequency,  Illuminance,  Jerk, (Change in Acceleration per unit time) Lengths, Length (Industrial), Length (Machine Shop) Luminance,  Luminous Intensity,  Magnetic Field Strength,  Magnetic Flux Density,  Mass,  Mass (Astro), Mass (Basic), Nautical Distance, Powers,  Power Ratios for 50Ω, 75Ω, 8Ω, and 32Ω system impedances,  Pressure,  Radioactivity,  Radioactivity Dosage,  Radioactivity Dosage Equivalents,  Temperature,  Time,  Torque,  Velocity,  Viscosities Kinematic,  Viscosities Dynamic,  Volume, Volume (fluid), and Weights. To copy the converted value you can share using the share button in the bottom second-from-left of the keypad or simply tap the converted value to copy the number into the clipboard. Any localized number value in the clipboard can be pasted into the top number field by simply tapping the field once. iPad: BabelUnits works well with other iPad apps. It can be used as a slider or separate floating window on iPad. Copy and paste from one app to BabelUnits. Just touch the input field to paste a copied number and touch the output field to copy the conversion value to another app. ## Key features - Extensive unit conversion categories - Scientific calculator with advanced functions - VoiceOver accessibility for visually impaired - Haptic feedback for actions - International and historical unit support - Fun comparative conversions ## Frequently asked questions about BabelUnits ### What is BabelUnits? BabelUnits is a paid scientific calculator and unit conversion app. It offers advanced mathematical functions and thousands of units across 35 categories, including international and historical units. It also features accessibility options for visually impaired users. ### How much does BabelUnits cost? BabelUnits is a paid application, priced at $0.29. This one-time purchase grants access to all its features and conversions without any additional in-app purchases or subscriptions. ### Does BabelUnits have ads? No, BabelUnits is ad-free. The developer explicitly states that the app is ad-free and does not collect any user information, allowing for use with peace of mind. ### What devices does BabelUnits support? BabelUnits is compatible with iPhone, iPad, and iPod touch devices. It is designed to run on Apple's mobile operating system. ### How often is BabelUnits updated? BabelUnits was last updated on August 29, 2023, with version 1.9.7. The app was initially released on May 11, 2021, indicating regular updates to improve functionality and add content. ### What are some of the unique conversion categories in BabelUnits? BabelUnits includes unique categories like 'Distance (Fun)' for comparing weights on Mars or heights with famous landmarks, and 'Velocity' for comparing speeds to Mach index or the speed of light. It also supports sports units. ### Is BabelUnits suitable for visually impaired users? Yes, BabelUnits is designed with accessibility in mind. It is VoiceOver capable, providing audio descriptions in English for buttons, units, number fields, and actions, along with haptic cues. ### What kind of scientific calculations can BabelUnits perform? BabelUnits features a powerful scientific calculator capable of natural logarithms, natural exponents, logarithms with any base, exponents of any real number, and statistical entries for mean, median, and standard deviations. It also includes trigonometric functions and their inverses. ## Version history (last 5 releases) ### 1.9.7 — 2023-08-29 Numbers are now formatted based on your "Language & Region" number format settings. Entries are now easier to read and understand! Rod, Perch, and Pole have now been referenced to the US Survey foot. A more common usage of these units. Added Firkin for 8 imperial gallons. Added the smoot unit of length. ### 1.9.6 — 2023-06-18 Parenthesis for grouping calculations separate from the ongoing calculation! Battery energies in Amp hours for most standard battery or bus voltage. 1.2V 1.5V 3V 3.3V 3.6V 9V 12V 24V 48V 350V 375V 400V 450V 800V Seconds in 秒 and 초. Now offering basic categories for area, distance, and mass. Each with more common conversions and fewer units to scroll through. A new bolt size category. It contains the relative maximum major and minor external diameters for bolts/screws in metric and SAE sizes. When converting from one bolt size to another BabelUnits provides a ratio between those bolt/screw sizes. The sizes that are provided are M1.2 to M14, American standard screw indexes from #0 to #12, and SAE sizes from ¼" to 4" wide bolts/screws. A new 'Jerk' or change in acceleration over time category. A new 'fun' category for distances with silly, interesting, unusual, and informative distance units. A new industrial volume category containing volumes often used by industries and businesses. A new spirits category that contains the myriad ways that alcohol and spirit volumes are measured. More complete torque values from mN-mm to N-m and ozf-mil to yd-lbf. Fixed centner units conversions. Added Deutschland-based zentner to mass conversions. Added zoll from Switzerland to distance conversions. Added pfund to mass conversions. Added poronkusema from Finland to distance conversions. Added Центнер to mass conversions. ### 1.9.5 — 2023-05-28 Parenthesis for grouping calculations separate from the ongoing calculation! Battery energies in Amp hours for most standard battery or bus voltage. 1.2V 1.5V 3V 3.3V 3.6V 9V 12V 24V 48V 350V 375V 400V 450V 800V Seconds in 秒 and 초. Now offering basic categories for area, distance, and mass. Each with more common conversions and fewer units to scroll through. A new bolt size category. It contains the relative maximum major and minor external diameters for bolts/screws in metric and SAE sizes. When converting from one bolt size to another BabelUnits provides a ratio between those bolt/screw sizes. The sizes that are provided are M1.2 to M14, American standard screw indexes from #0 to #12, and SAE sizes from ¼" to 4" wide bolts/screws. A new 'Jerk' or change in acceleration over time category. More complete torque values from mN-mm to N-m and ozf-mil to yd-lbf. ### 1.9.2 — 2022-07-23 Fix for Mass (Flow) conversions ### 1.9.1 — 2022-07-02 New Features: Full Accessibility interface. All controls are VoiceOver capable and now provide feedback through audio cues and haptic feedback. Haptic interface with sounds for all controls. Astronomical Masses - All masses of the larger solar system objects are provided for reference Masses provided are: Enceladus Ceres Pluto Eris Triton Europa Moon Io Callisto Titan Ganymede Mercury Mars Venus Earth Uranus Neptune Saturn Jupiter and the Sun Added new Real Estate (Area) units category that allows conversion between units specifically related to assessing plots of land used in real estate transactions. Square meters Square feet Hectare Acres 坪 (Tsubo) Square survey ft Square km Square miles Square survey miles Brass Section Township Kirat Feddan Labor League (TX)   New mass flow unit conversions added that measure an amount of mass flowing per unit time. Temperature conversions now include offsets to various important phase change points of common elements. '+', '-', '×', '÷', and 'x to the y' buttons will pulse gently to indicate when an operation is in progress, until either '=', another operator button is pressed, or "all clear" is pressed. Take the log of any base using the new 'lgₓy' button. Enter the base, press 'lgₓy' and then the number of which one wants to take the logₓ. 'MR' button will pulse gently to indicate that the memory currently holds a value other than zero. Statistics buttons for mean, median, standard deviation sample deviation, and standard deviation population. Mean button will pulse gently to indicate when statistical data is available. Added new Chinese mass units: 克 (Kè), 市錢 (Qián), 市两 (Liǎng), 市斤 (Jin), 公斤 (Gōng Jin), 市担 (Dàn), 市擔 (Dàn trad.), and 公担 (Gōng Dàn) Added wine bottle and barrel sizes to volume conversions: Piccolo, Split, Quarter, Demi, Half, Jennie, Standard, Magnum, Double Magnum, Jeroboam, Rehoboam, Imperial, Methuselah, Salmanazar, Balthazar, Nebuchadnezzar, Melchior, Solomon, Primat, Goliath, Melchizedek, Midas, Demi-barrique, Barrique, Bordelaise, American Oak hogshead (hhd), Demi-muid, and Tonneau. Added Quintal for US pounds. Added mcg abbreviation that is sometimes used for microgram unit. Added British brewers' barrel to volume conversions. Added 'µL/s', 'µL/min', and 'µL/h' flow conversions. Added Japanese lengths: 分 (Bu), 寸 (Sun), 尺 (Shaku), 間 (Ken), and 里 (Ri) Added 里 (Ri) Korean length Added Japanese mass units: 丸 (Maru), キロ (Kilo eng.), and 貫 (Kan) Added грамм (gram), г (gram), and кг (kilogram) Cyrillic mass units Added 坪 (Tsubo) Japanese area Added метр, Cyrillic for meter. Added литр, Cyrillic for liter Added 合 (go) Japanese volume Added 市升 (sheng) Chinese volume Added рад, Cyrillic abbreviation for radians Added стер, Cyrillic abbreviation for steradian Fixes: Fixed an issue with Quintal metric mass unit conversion --- *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 2026-06-10.*