All-in-one calculator: basic, scientific, unit & currency converter
Calculator by Notes - To Do List is a versatile, free app offering basic and scientific math, plus a unit and currency converter, all in one. It ranks in the TOOLS category across MX (#29), BR (#44), and FR (#73) with a solid 3.96 rating from thousands of users, and benefits from a large total install base with strong recent momentum. The app supports offline use and a floating mode for multitasking, making it a practical choice for students, engineers, and everyday users.
Pros & Cons
All-in-one tool: basic, scientific, unit and currency conversions
Floating mode enables multitasking without leaving the current app
Calculation history for quick recall and re-use of formulas
After Call screen and quick access post-call utilities
Offline functionality for basic and scientific calculations
Light and Dark themes for readability and battery efficiency
Lacks explicit AI-powered features or professional-grade solver tools mentioned in competing apps
Uses a broad permission set (ads, overlays, phone state) which may raise privacy considerations for some users
About Calculator
Calculator is a tools app developed by Notes - To Do List.
How many times has Calculator been downloaded?
Calculator has been downloaded 3.8 million times. In the last 30 days, the app was downloaded 330 thousand times.
What is the rating of Calculator?
Calculator is rated 4.14 out of 5 stars, based on 3 thousand ratings.
Is Calculator free?
Calculator is free to download. The APK download size is 16.43 MB. The latest version available is 1.18. The last update was on June 23, 2026.
What are the requirements for Calculator?
Calculator requires Android 8.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play December 2025.
Description
Calculator: Scientific, Unit Converter & Floating Mode!
Experience the most versatile free calculator app designed with a sleek, modern interface. Whether you need a simple calculator for daily math or a powerful scientific calculator for complex problems, this app adapts to your needs.
Switch seamlessly between Light and Dark modes to match your style, and multitask like a pro with our unique Floating Calculator feature!
Why this is the best Calculator App:
Basic calculator for students, engineers, and everyday users, this app functions like a physical calculator but adds digital power. It combines a unit converter, smart calculation history.
Simple Calculator can turn into a scientific calculator, allowing you to calculate more complex equations such as quadratic equations, sine, cosine, and tangent.
Using this calculator app, you can perform both arithmetic and scientific calculations. You can also re-enter previously calculated formulas as they are by tapping the formula in the calculation history. This simple calculator utility for Android provides the four fundamental operations as well as engineering calculations.
Key Features:
🧮 Simple & Scientific Calculator
⦿ Simple Calculator: Perfect for quick arithmetic. Add, subtract, multiply, and divide with a clean, easy-to-read layout.
⦿ Scientific Calculator: Tap the engineering calculator icon to open the scientific calculator. Access advanced scientific math functions including log, ln, sin, cos, tan, square root (√), and parentheses for complex equations. Perfect for math homework and engineering tasks.
📱 Floating Calculator
⦿ Multitask effortlessly! Enable the floating view to keep a compact calculator overlay on your screen while using other apps. Calculate numbers while reading documents or browsing the web without switching apps.
📏 Unit Converter
⦿ Tap the unit calculator button to convert and calculate units. You can easily calculate different units such as area, length, and temperature, and more. It’s the perfect companion for homework or technical projects.
📝 Smart Calculation History
⦿ Never lose your progress. The calculation history saves your past computations automatically. Tap the calculation records icon to view the previous results, check for errors, or recall numbers for new calculations.
🎨 Customizable Themes
⦿ Your calculator, your way. Choose between a crisp Light Mode for daytime clarity or a battery-saving Dark Mode that’s easy on the eyes at night.
Who is this for?
⦿ Students: Solve math problems and convert units for science class. ⦿ Engineers: Access scientific functions and history on the fly. ⦿ Everyone: A reliable and easy-to-use tool for daily use, shopping, and work.
Download now and upgrade to the most convenient calculator app with floating window smart features!
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★★★★★Thobile Nzimande· Jul 3, 2026
It's very easy to use it to check relationships. Ex: $r$ between "filter change hours" vs "downtime minutes" to see if delays are there or not
★☆☆☆☆charles mcdonald· Jun 7, 2026
Why does a calculator need access to your phone? Google is the worst thing to happen to society in my lifetime. Should be stripped of all access it has to society and it's snooping. Worse than a Russian spy
★☆☆☆☆David Clark· Jun 12, 2026
Won't even open without you giving it every single permission. Why the hell does a calculator need access to my phone calls?
★☆☆☆☆Al Par· Jun 14, 2026
Why does a calculator need access to things like my call log ect... abit weird so uninstalled straight away
★☆☆☆☆Juanita Jac· May 28, 2026
Frustrates the entire experience by complicating navigation between apps and hogs up the screen with unwanted adds. It turned my phone to a billboards adds machine
Google Play Rankings for Calculator
This app is not ranked
Technologies used by Calculator
17 permissions
Subscribe to see full permission and library details
Trust & Safety: The app requests a broad set of permissions including ads-related IDs, network state, overlay and phone-related permissions. It provides useful calculator features (offline operation, after-call tools) but users should review permissions and monitor how data is used, especially for ad-supported functionality.
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