OneCalc: All-in-one Calculator

3.7K reviews
Content rating
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About this app

All-in-one Calculator is the most comprehensive calculator app for Android with many useful additional features.


• Perform basic calculations such as addition, subtraction, multiplication, and division
• Advanced mode supports scientific operations such as trigonometric, logarithmic, and exponential functions
• Percentage key to quickly add percentage to a number or subtract percentage from a number


Unit conversion
• Supports all common units used for measuring length, mass, temperature, area and volume

• Right triangle calculator to help with 3-4-5 rule
• Area and volume of geometric shapes
• Land area calculator using compass

• Finance module has calculators for savings and loan repayment
• Interest calculation using simple and compound interest
• Currency converter (not realtime, currency rates updated 4 times a day)

Everyday Math
• Add/ subtract fractional numbers
• Calculators for finding discount price, tip amount and price per unit when out shopping or dining
• Calculate profit margin and tax-included/ tax-excluded price of goods and services

Date/ Time
• Calculate past and future dates by adding/ subtracting days, weeks, or months
• Days between two dates

• Age calculator
• BMI calculator
Updated on
Jun 29, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, App activity and 2 others
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

3.58K reviews
Randy Cassel
March 17, 2023
Never liked the calculator that came with the phone. Found another app that I liked but it seems that updates over time began to make the app hang up as well as the phone. Stumbled on to this one by accident and I love it. It's smooth and the several different themes means there is one you will probably like. It is both a simple calculator and a trigonometry calculator. I couldn't ask for more.
10 people found this review helpful
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Roy McNary
July 20, 2020
I really like the calculator a lot and would give it five stars except, I bought the ad free version and I still get ads. They don't go away. **I see I had both apps installed an was using the wrong one. That is confusing. Thanks for clarifying it.
26 people found this review helpful
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Everyday Calculation Apps
July 20, 2020
Please check that you are using the correct version of the app. The icon of both the free and paid version looks similar. The paid version has a yellow star on the icon.
Bud Johnston
March 10, 2021
Probably the most convenient and comprehensive conversion collection in a small format. The only way I could think of to improve it be including some conversions (yards needed for concrete) and plug in formulae. Lb/A = Kg/Ha, Gal/Acre = L/Ha, Oz/SqFt = Gm/SqDecM examples Adding a dedicated reciprocal key would be very handy.
40 people found this review helpful
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What's new

Minor improvements