Best Conversion Calculator Percentage Apps

221+ iOS apps curated and reviewed

4.6 avg rating
18 free apps
Updated May 2026

Looking for free conversion calculator percentage apps? 18 of our 221+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Top Picks for Conversion Calculator Percentage

Conversion Calculator !#1

Conversion Calculator ! by oWorld Software

Currency, Temperature, Length
Editor's Choice
✈️ Travel
4.6😐(13K ratings)
FreeAdsIn-App Purchases
Conversion Calculator ! screenshot 1
Conversion Calculator ! screenshot 2
Conversion Calculator ! screenshot 3
Conversion Calculator ! screenshot 4
Conversion Calculator ! screenshot 5
Conversion Calculator ! screenshot 6

Easily convert between various units of measurement, including currencies, temperature, length, and weight. This intuitive tool provides real-time currency exchange rates and a comprehensive list of conversions for everyday use.

What We Love

  • 🚀 Easy to use
  • 🚀 Comprehensive unit conversions
  • 👍 Helpful app
  • 👍 Practical for engineering and mechanics

Room to Improve

  • 🔍 Too many ads
  • 🔍 Ads make the app unusable
  • 🔍 Ads are invasive and disrupt user experience
Calculator +#2

Calculator + by Sarah Ragab

Scientific Calc Plus Fraction
Strong Contender
🔧 Utilities
4.6😊(9.6K ratings)
FreeAdsIn-App Purchases
Calculator + screenshot 1

This app offers a free basic and scientific calculator with an intuitive interface. It supports fractions, percentages, and advanced editing. Optional upgrades provide specialized calculators for fractions with units, polynomial and linear equation solving, graphing, and geometric shapes.

What We Love

  • 👍 Great features and easy to use
  • 👍 Efficient and quick
  • 👍 Versatile, functional calculator
  • 👍 Fantastic, easy to use app

Room to Improve

  • 🐛 New updated layout is awful
  • 🐛 App is now terrible
  • 🔒 Paying customer screwed over by update
Calculator·#3

Calculator· by Tim O's Studios, LLC

Big Basic Calculator
Worth Considering
🔧 Utilities
4.9😊(33K ratings)
FreeAdsIn-App Purchases
Calculator· screenshot 1
Calculator· screenshot 2
Calculator· screenshot 3
Calculator· screenshot 4
Calculator· screenshot 5

This app offers a straightforward calculation experience, focusing on essential functions without unnecessary complexity. It includes basic arithmetic, percentage calculations, and advanced functions like square root. Users can customize the appearance with multiple color schemes and utilize features like result copying and split-screen multitasking on iPad.

What We Love

  • 👍 Simple and easy to use
  • 🚀 Quick and responsive
  • 💡 Percentage function works well
  • 👍 Large, clear buttons

Room to Improve

  • 🔋 Frequent ads can be distracting
  • 🐛 Occasional crashes or freezes
  • 🔒 Lack of customization options

More Conversion Calculator Percentage apps to explore

4
ClevCalc - Calculator
ClevCalc - Calculator
ClevCalc - Calculator
All-In-One Calculator
Free

This comprehensive calculator app offers a wide range of tools for everyday calculations, from basic arithmetic and scientific functions to unit and currency conversions. It includes specialized calculators for loans, health, fuel costs, GPA, and more, all within a clean and user-friendly interface.

Scientific calculatorUnit converterCurrency converter
📊 Productivity
(12K)
free with in-app purchases
5
Calculator for iPad₊
Calculator for iPad₊
Calculator for iPad₊
Basic, Scientific, Plus Calc
Free

This app offers both basic and advanced scientific calculations with an intuitive interface designed for tablets and phones. It includes features like currency conversion, calculation history, and the ability to share results. An optional premium membership removes ads and provides enhanced support.

Basic & Scientific CalculatorAdvanced Scientific FunctionsLive Currency Converter
🔧 Utilities
(126K)
free with in-app purchases
6
Basic Calculator: Classic Calc
Basic Calculator: Classic Calc
Basic Calculator: Classic Calc
big buttons and wallpapers
Free

A free, classic calculator app with large, easy-to-press buttons and customizable skins. It supports basic arithmetic, memory functions, and can handle very large numbers without using scientific notation. Multitasking is also supported on compatible devices.

Large, easy-to-press buttonsMultiple beautiful skinsBasic arithmetic operations
🔧 Utilities
(3.1K)
free with in-app purchases
7
OneCalc: All-in-one Calculator
OneCalc: All-in-one Calculator
OneCalc: All-in-one Calculator
Calculates everything. Try it.
Free

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 convertersStandard and scientific calculator functionsFinancial calculators (interest, loan, currency)
📊 Productivity
(4.8K)
free with in-app purchases
8
Financial Calculator: Percent
Financial Calculator: Percent
Financial Calculator: Percent
Tax Percentage, Profit Margin
Free

This app offers a comprehensive suite of over 40 financial and utility calculators. Easily handle complex calculations like investment analysis, tax percentages, profit margins, and everyday percentage needs with a clean and intuitive interface.

Over 40 built-in calculatorsFinancial calculators (ROI, IRR, NPV)Tax and profit margin calculations
💰 Finance
(14K)
subscription
9
Scientific Calculator Plus 991
Scientific Calculator Plus 991
Scientific Calculator Plus 991
Designed for math calculator
Free

This app is a powerful scientific calculator with graphing capabilities, a formula library, and a unit converter. It offers natural display input, advanced math functions for algebra, calculus, and statistics, and supports various number bases and formats.

Natural display inputGraphing moduleFormula library
📚 Education
(12K)
free with in-app purchases
10
The Percentage Calculator (Discount Calculator)
The Percentage Calculator (Discount Calculator)
The Percentage Calculator (Discount Calculator)
by Michael Jenkins
Free

Easily calculate discount percentages or find the percentage of one value relative to another. The app displays all calculated amounts rounded to two decimal places for clarity.

Calculate discount amountFind percentage of valueSlider for discount input
🔧 Utilities
(18)
free
11
Calculator₊
Calculator₊
Calculator₊
Basic, Scientific, Plus Calc
Free

This app offers a comprehensive suite of calculation tools, including basic, scientific, and unit conversion functions. It features an AI-powered math solver that can solve problems from photos and a dedicated math notes section for jotting down equations and diagrams. Accessibility options like dynamic text size and VoiceOver support are also included.

Basic and scientific calculationsUnit and currency converterAI-powered math solver with photo recognition
🔧 Utilities
(1.7M)
free with in-app purchases
12
Unit Converter - Best Unit App
Unit Converter - Best Unit App
Unit Converter - Best Unit App
Convert All Units and Currency
Free

Easily convert between a wide range of units across 20 categories, including length, weight, temperature, and more. Features live currency updates for 155 world currencies, refreshed daily. Designed for simplicity and visual appeal.

20 conversion categoriesLive currency updates155 world currencies
✈️ Travel
(172K)
free with in-app purchases
13
Conversion Calculator Units
Conversion Calculator Units
Conversion Calculator Units
Unit Conversion Calculator All
Free

This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.

Converts over 140 unitsSupports 12 conversion categoriesCustomizable themes
🔧 Utilities
(4.8K)
free with in-app purchases
14
Calculator ∞
Calculator ∞
Calculator ∞
The Best Scientific Calculator
$5.99

This advanced calculator app offers a powerful math core and algebra engine for basic to complex calculations. It includes features like step-by-step solutions, handwriting recognition, and 2D graphing, making it suitable for students, engineers, and programmers.

Step-by-step solution hintsMath Photos SolverHandwriting Recognition
📚 Education
(6.2K)
free with in-app purchases
15
Calculator+ - Unit Conversion
Calculator+ - Unit Conversion
Calculator+ - Unit Conversion
Advanced Calculator Utility
Free

This advanced utility app offers a comprehensive suite of calculation and conversion tools, serving as a powerful alternative to standard device calculators. It features a sleek interface and supports a wide range of everyday and scientific computations, including unit conversions for length, area, volume, and more.

General and scientific calculationsExtensive unit conversions (length, area, volume, etc.)BMI, investment, EMI, and tax calculators
🔧 Utilities
(1)
free
16
Convert Any Unit Lite
Convert Any Unit Lite
Convert Any Unit Lite
Units & Currency Converter
Free

Quickly convert between thousands of units with an intelligent search and autocomplete feature. This app offers a streamlined interface, an integrated calculator, and the ability to save favorite conversions. It supports over 6,400 units across 51 categories, making it a comprehensive tool for all your conversion needs.

Intelligent unit search with autocompleteAutomatic category selectionIntegrated calculator
✈️ Travel
(47K)
ad-supported
17
Percentages Calculator
Percentages Calculator
Percentages Calculator
by Thomas Tsopanakis
$0.99

Effortlessly perform complex percentage calculations with this intuitive tool. It offers nine distinct functions to handle increases, decreases, percentage changes, and finding original values. Copy results instantly for quick use.

Increase value by percentDecrease value by percentCalculate percentage of a number
💼 Business
(1.3K)
free
18
Best Percentage Calc
Best Percentage Calc
Best Percentage Calc
Reduction and Increase
Free

Calculate percentage changes quickly and easily. This tool helps determine starting values, percentages, differences, or end values for various scenarios like salary increases or sale promotions.

Calculate percentageCalculate increaseCalculate reduction
🔧 Utilities
(276)
ad-supported
19
Calculator⁼
Calculator⁼
Calculator⁼
Fraction, Scientific Calc +
Free

This app offers a clean and intuitive interface for both basic arithmetic and advanced scientific calculations. It includes a history tape to review past computations and supports various mathematical operations, making it suitable for everyday use and complex problem-solving.

Basic & Scientific CalculatorLive Currency ConverterHistory Tape
🔧 Utilities
(357K)
free with in-app purchases
20
Conversion Calculator Plus
Conversion Calculator Plus
Conversion Calculator Plus
Unit Converter
Free

This app is a versatile unit and currency converter with a user-friendly interface. It supports a wide range of conversion categories, including real-world and crypto currencies, with automatic exchange rate updates. Customize your experience with design options, dark mode, and adjustable home screen layouts.

Unit and currency conversionSupports 160+ currencies (real & crypto)Automatic currency exchange rate updates
📊 Productivity
(15K)
free with in-app purchases