1+1 Calculator
Show your work, every time
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
See every step on an always-on tape, run calculators in tabs, go scientific, split the bill with tip, and sort VAT or GST in seconds — no ads, no tracking.
1+1 Calculator does the math and shows its work.
Most calculators give you only an answer. This one keeps an always-on tape of your calculations on the main screen — every expression and result, with correct operator precedence — so you can double-check your work and reuse earlier answers with a tap.
Built for everyday math:
An always-on history tape, so you see your steps and not just the answer
Multiple calculators in tabs to keep separate calculations side by side
A scientific calculator with trig, logs, powers, and roots for the harder problems
A VAT / GST calculator: enter net, VAT, or gross and get the other two instantly, with the rate prefilled for your region
A tip & split calculator: enter the bill, pick a tip, and split the check across the table
A memory bank to copy and reuse values
Plus money tools that look ahead:
A budget and trip-budget planner to keep track of what you spend
An interest calculator to see how savings grow over time
A FIRE calculator to estimate your path to financial independence
A clean, modern design for iPhone and iPad. No ads. No tracking. Just a fast, honest calculator.
Ratings & Reviews
A from-scratch rebuild for modern iPhone and iPad: an always-on calculation tape, calculator tabs, a scientific mode, plus VAT/GST, tip, interest and FIRE calculators. No ads.
The developer, HUY HOANG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- HUY HOANG
- Size
- 4.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 9 more
- English, Dutch, French, German, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- 1+1 Infinity Lifetime Purchase $49.99
- Copyright
- © 2015-2026 Huy Hoang