Best Free Calculator App

250+ iOS apps curated and reviewed

4.3 avg rating
18 free apps
Updated September 2026

Every iPhone needs a few good free calculator app. We benchmark 250+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Free Calculator App (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1CalculatorCalculatorFree3.0★ (8.9K)NoNoSep 2026
2Basic Calculator+Basic Calculator+Free4.9★ (243K)YesNoSep 2026
3Calculator - Free CalculatorCalculator - Free CalculatorFree4.2★ (1.4K)NoNoSep 2026
4Calculator‰Calculator‰Free4.9★ (409K)YesNoSep 2026
5Calculator₊Calculator₊Free4.7★ (1.7M)YesYesSep 2026
6Calculator for iPhone and iPadCalculator for iPhone and iPadFree4.7★ (15K)YesYesSep 2026
7Calculator for iPad!Calculator for iPad!Free4.7★ (61K)NoNoSep 2026
8Calculator for iPad₊Calculator for iPad₊Free4.5★ (126K)YesYesSep 2026

Top Picks for Free Calculator App

Calculator#1

Calculator by Apple

Editor's Choice
🔧 Utilities
3.0😞(8.9K ratings)
Free
Calculator screenshot 1
Calculator screenshot 2
Calculator screenshot 3
Calculator screenshot 4

This app offers both basic and scientific calculators for quick solutions to mathematical expressions. It also features a "Math Notes" function that allows users to type or write out equations and see them solved inline, with support for variables and graphing.

What We Love

  • 👍 Basic calculator functionality
  • 💡 Math notes feature
  • 🚀 Clean, simple design

Room to Improve

  • 🐛 Calculation errors
  • 🔍 Lack of history/memory functions
  • 🤔 Inconvenient to access advanced features
  • 🤯 Frustrating to fix mistakes
  • 🙄 Removed useful features in recent updates
Basic Calculator+#2

Basic Calculator+ by Best Free Apps

Basic Four Function Calculator
Strong Contender
🔧 Utilities
4.9😊(243K ratings)
FreeAds
Basic Calculator+ screenshot 1
Basic Calculator+ screenshot 2

Perform essential arithmetic operations with a straightforward calculator app. Its large buttons and clear display ensure ease of use, supporting both portrait and landscape orientations.

What We Love

  • 👍 Easy to use
  • 👍 Large, clear buttons
  • 👍 Straightforward, basic functionality
  • 👍 No ads or in-app purchases
  • 👍 Works well on iPad

Room to Improve

  • 🐛 Inconsistent click volume
  • 🐛 Ads can be intrusive or disruptive
  • 🐛 Missing backspace/delete function
Calculator - Free Calculator#3

Calculator - Free Calculator by 祥祎 刘

Worth Considering
🔧 Utilities
4.2😊(1.4K ratings)
Free
Calculator - Free Calculator screenshot 1
Calculator - Free Calculator screenshot 2

A straightforward and reliable calculator application designed for iPad and iOS 9. It offers a standard calculation experience with a charming piano sound effect and is optimized for high-resolution screens.

What We Love

  • 👍 Simple and easy to use
  • 🎶 Piano sound effects
  • 💰 Free with no subscription
  • 🆓 No ads
  • 🆘 Helpful for homework and math problems

Room to Improve

  • 🔍 Lacks advanced features (no percentage, square root, etc.)
  • 📏 Cannot rotate to landscape mode
  • 🐛 Occasional crashes or inaccurate results
  • 📱 Not optimized for iPad use

More Free Calculator App apps to explore

FAQ about Free Calculator App

What is the best free calculator app for iPhone?
Calculator tops our free calculator app ranking as of September 2026, with a 3.0-star average from 8.9K App Store ratings, and it's free to download.
Calculator has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 250+ free calculator app on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
This app provides both basic and scientific calculators for solving mathematical expressions. It also includes a "Math Notes" feature that allows you to type or write out equations and have them solved inline. You can create and use variables, plot equations on graphs, and perform unit and currency conversions.
Yes, the app supports graphing equations. You can type or write an equation and then tap to graph it within Math Notes. You can zoom, pan, resize the graph, and even add multiple equations to the same graph to see their relationships.