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OneCalc: All-in-one Calculator

OneCalc: All-in-one Calculator

Calculates everything. Try it.

5.1K ratings
298 reviews
With Ads
🔧 Utilities
📊 Productivity
Free
With Ads

Details

Released
February 21, 2018
Updated
August 17, 2026

Features

Developer

tasser gyati
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iphone
ipad
📌Ready
Reviews summary↘︎
⭐298
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📝16+ tags
Tags↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦~ in 2 months
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About

This app offers a comprehensive suite of over 40 calculators and unit converters for various needs, including finance, health, construction, and everyday math. It features standard, scientific, and specialized calculators for tasks like loan amortization, currency conversion, and material estimation.

✓Over 40 calculators and unit converters
✓Standard and scientific calculator functions
✓Financial calculators (interest, loan, currency)
✓Health calculators (BMI, calories, pace)
✓Construction material calculators
✓Date and time duration calculations
✓Business and shopping calculators
Show original description

What users say about OneCalc

Reviews of OneCalc are mostly positive: the Productivity app is rated 4.6/5 from 5.1K App Store ratings. What users like most: excellent app with many handy extras, easy to use and one of the daily drivers. Top complaints: crashes when using the 'More' section, incorrect date duration calculations. Summarized from real user reviews.

Positive things

  • 🚀Excellent app with many handy extras
  • 👍Easy to use and one of the daily drivers
  • 👍Helps with work
  • 👍Great for calculations and conversions
  • 👍Includes fractions
  • 👍Perfect for construction and accounting tasks
  • 👍Sleek modern design with lots of features
  • 👍Useful for students and middle schoolers
  • 👍Versatile and has everything needed

Negative things

  • 🐛Crashes when using the 'More' section
  • 🐛Incorrect date duration calculations
  • 🔍Ads can be intrusive and disrupt calculations
  • 🔍Confusing keyboard layout with underlined keys
  • 🔍Paid version still shows ads
  • 🔍Lacks scientific functions needed for homework
See all reviews

What's New in OneCalc

1.6.1

August 17, 2026

Minor improvements

User reviews

Most RecentHighest RatedLowest Rated

Works Well

Works well, but I cannot find the scientific calculator.
chopfingerchopfinger

Kinda mid though

I am a student at Eagle Point Middle School. 7th grade is hard math homework. But it is kind of complicated and confusing to find everything on the map (hence the 3 stars) I have over 1000 days of no adds but over all pretty good you should get it
Ilovekira🥰🩷❤️Ilovekira🥰🩷❤️

Really good for iPad where Apple don’t provide a calculator

Looks nice on iPad and just viewing a video add for a minute will give you a full day of add free use (great way). I like this option as the other calculator apps that pop up ads DURING calculations are really annoying and not viable to use when it interferes with a long calculation. Or register a copy if you use it a lot.

Lots of extras like conversions and area calcs. You just fill in a few cells (boxes) with numbers and get answers. Bit like using a spreadsheet. Plus History. Switch to scientific via a tap on the calc symbol bottom of screen - missed that at first.
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Andy T8Andy T8

My issue

I like the app. I paid for no ads. Now I get very annoying ads.
Jrb1jrbJrb1jrb

HV

Works great with many options
HVS3HVS3
See 293 more reviews

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User experience

🐞

Reported Bugs

3 issues

Crashes when using the 'More' section

Bug

Incorrect date duration calculations

Bug

Paid version still shows ads

Bug
✨

Requested Features

7 requests

Add more than 2 slots for conversions

Feature

Include a 'log' feature

Feature

Add a 'simplify fractions' unit

Feature

Improve the 'Date duration' calculator

Feature

Add a 'Business' mode with cost, sell, and margin keys

Feature

Add a millimeters conversion option

Feature

Implement a 'clear' button to easily delete fields

Feature

FAQ

What does the All-in-one Calculator app do?

This app provides a free, ad-supported collection of over 40 specialized calculators and unit converters. It covers a wide range of categories including finance, health, date and time, construction, shopping, and everyday math, making it a versatile tool for various calculation needs.

What are the key features of this calculator app?

Key features include a standard calculator with advanced scientific functions, a unit converter for metric/imperial units, financial calculators for loans and savings, health trackers like BMI and calorie calculators, construction material estimators, and date/time duration calculators.

Is this calculator app free to use?

Yes, the app is free to download and use. However, it does contain advertisements. There are no in-app purchases mentioned in the provided description.

What devices is this calculator app compatible with?

The app is designed for iPhone and iPad devices. It offers a comprehensive set of tools suitable for a variety of calculation tasks on these Apple mobile platforms.

What are some common use cases for this app?

Common use cases include calculating loan payments and interest, converting currencies, tracking health metrics like BMI, estimating materials for DIY projects, calculating profit margins, and finding the duration between dates or times.