Best Conversion Calculator Free Apps

249+ iOS apps curated and reviewed

4.7 avg rating
20 free apps
Updated November 2026

The best conversion calculator free apps on iPhone average 4.7β˜… across 249+ titles β€” we've ranked them by what real users actually keep on their phones. Updated November 2026.

Compare top Conversion Calculator Free Apps (November 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Unit Converter - Best Unit AppUnit Converter - Best Unit AppFree4.8β˜… (200K)YesYesNov 2026
2Currency converter calculator!Currency converter calculator!Free4.7β˜… (73K)YesYesNov 2026
3Convert Any Unit LiteConvert Any Unit LiteFree4.7β˜… (48K)YesNoNov 2026
4Conversion Calculator UnitsConversion Calculator UnitsFree4.7β˜… (5K)YesYesNov 2026
5Metric Conversion toolMetric Conversion toolFree4.8β˜… (15K)YesNoNov 2026
6Unit Converter - Convert allUnit Converter - Convert allFree4.6β˜… (14K)YesYesNov 2026
7Conversion Calculator PlusConversion Calculator PlusFree4.7β˜… (15K)YesYesNov 2026
8MO - Converter & CalculatorMO - Converter & CalculatorFree5.0β˜… (2)NoNoMay 2026

Top Picks for Conversion Calculator Free

Unit Converter - Best Unit App#1

Unit Converter - Best Unit App by Alan Mrvica

Convert All Units and Currency
Editor's Choice
✈️ Travel
4.8😊(200K ratings)
FreeAdsIn-App Purchases
Unit Converter - Best Unit App screenshot 1
Unit Converter - Best Unit App screenshot 2
Unit Converter - Best Unit App screenshot 3
Unit Converter - Best Unit App screenshot 4
Unit Converter - Best Unit App screenshot 5
Unit Converter - Best Unit App screenshot 6

Easily convert between a vast array of units and currencies with live exchange rates. This app offers a simple, intuitive interface for over 20 categories, making it ideal for everyday tasks and travel.

What We Love

  • πŸš€ Easy to use
  • πŸ‘ Comprehensive conversions
  • πŸ’‘ Useful for travel and cooking
  • πŸš€ Quick and efficient
  • πŸ‘ Intuitive interface

Room to Improve

  • πŸ› Limited character input
  • πŸ› Difficulty with negative numbers
  • πŸ’‘ Lack of ability to quickly switch between conversions
  • πŸ’° Pro version not worth the cost
4.7😐(73K ratings)
FreeAdsIn-App Purchases
Currency converter calculator! screenshot 1
Currency converter calculator! screenshot 2
Currency converter calculator! screenshot 3

This app provides real-time exchange rates for all world currencies, including cryptocurrencies, and functions offline. It features an embedded calculator, the ability to set custom rates, and updates hourly. An optional premium version removes ads and offers additional features.

What We Love

  • πŸ‘ Easy to use
  • πŸš€ Fast and accurate currency conversions
  • πŸ’‘ Helpful for travel and international transactions
  • πŸ”’ Offline functionality

Room to Improve

  • πŸ” Limited currency options in free version
  • πŸ’° Subscription required to unlock full features
  • πŸ“’ Excessive advertisements
  • πŸ› Bugs and crashes reported
Convert Any Unit Lite#3

Convert Any Unit Lite by Cider Software LLC

Units & Currency Converter
Worth Considering
✈️ Travel
4.7😊(48K ratings)
FreeAds
Convert Any Unit Lite screenshot 1
Convert Any Unit Lite screenshot 2
Convert Any Unit Lite screenshot 3
Convert Any Unit Lite screenshot 4
Convert Any Unit Lite screenshot 5

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.

What We Love

  • πŸ‘ Easy to use
  • πŸš€ Comprehensive unit conversions
  • πŸ’‘ Allows custom unit creation
  • πŸ”§ Useful for cooking, travel, and work
  • πŸ” Intuitive and straightforward interface

Room to Improve

  • πŸ” Too many unit options can be overwhelming
  • πŸ” Ads can be intrusive and disrupt usage
  • πŸ› Occasional bugs and freezing issues
  • πŸ”‹ High ad frequency drains battery quickly

More Conversion Calculator Free apps to explore

FAQ about Conversion Calculator Free

What are the best conversion calculator free apps for iPhone?
Unit Converter - Best Unit App tops our conversion calculator free apps ranking as of November 2026, with a 4.8-star average from 200K App Store ratings, and it's free to download.
Unit Converter - Best Unit App shows ads and offers in-app purchases, according to its App Store listing as of November 2026.
We track 249+ conversion calculator free apps on the iOS App Store as of November 2026, ranked by rating, recency, and analysis of real user reviews.