1. Home
  2. Topics
  3. Unit Conversion Calculator For Engineers

Best Unit Conversion Calculator For Engineers Apps

194+ iOS apps curated and reviewed

4.6 avg rating
20 free apps
Updated June 2026

Finding the right unit conversion calculator for engineers app can be overwhelming with so many options. We've analyzed 194+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.

Top Picks for Unit Conversion Calculator For Engineers

Convert Any Unit Lite#1

Convert Any Unit Lite by Cider Software LLC

Units & Currency Converter
Editor's Choice
āœˆļø Travel
4.7šŸ˜Š(47K 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

  • šŸ‘ Easy to use
  • šŸš€ Comprehensive unit conversions
  • šŸ’” Allows custom unit creation
  • šŸ”§ Useful for cooking, travel, and work

Room to Improve

  • šŸ” Too many unit options can be overwhelming
  • šŸ” Ads can be intrusive and disrupt usage
  • šŸ› Occasional bugs and freezing issues
CONVERT UNITS#2

CONVERT UNITS by Yan Liong Tan

Simple unit conversion tool
Strong Contender
šŸ“Š Productivity
4.8šŸ˜Š(932 ratings)
FreeAds
CONVERT UNITS screenshot 1
CONVERT UNITS screenshot 2
CONVERT UNITS screenshot 3

Easily convert between various units of measurement including length, weight, temperature, and currency. Features automatic currency updates, a vast selection of currencies, and customizable display options for accuracy and rounding. Optimized for multitasking on iPad and offers a beautiful dark design.

What We Love

  • šŸ‘ Quick & easy to use
  • šŸ‘ Ease of use
  • šŸ‘ Simple and easy to use
  • šŸ‘ Well thought out and easy to use

Room to Improve

  • šŸ› Ads obstruct use
  • šŸ› Subscription required to remove ads
  • šŸ› Currency conversion not working
Units - Pro Unit Converter#3

Units - Pro Unit Converter by Homegrown Software Ltd

Worth Considering
šŸ”§ Utilities
3.6šŸ˜(150 ratings)
FreeAdsIn-App Purchases
Units - Pro Unit Converter screenshot 1
Units - Pro Unit Converter screenshot 2
Units - Pro Unit Converter screenshot 3

Easily convert between hundreds of units across 43 categories, including currency with daily updated rates. Customize your workflow by hiding or reordering units and categories.

What We Love

  • šŸš€ Efficient and fast conversions
  • šŸ‘ Comprehensive list of units
  • šŸ” Customizable unit selection
  • šŸ’° Free app with optional paid version

Room to Improve

  • šŸ› Crashes and stability issues
  • šŸ•°ļø Outdated currency conversion rates
  • šŸ” Too many unit categories, hard to navigate

More Unit Conversion Calculator For Engineers apps to explore

4
Unit Converter - Any Unit
Unit Converter - Any Unit
Unit Converter - Any Unit
Units & Currency Converter
Free

This tool simplifies unit conversions for various measurements like length, weight, and temperature. It offers instant, precise results with a clean interface, making it ideal for students, professionals, and everyday users needing quick calculations.

Converts length, weight, temperature, time, speed, area, volumeHandles scientific unitsInstant and precise results
šŸ”§ Utilities
(1)
free
5
Unit Converter - Pro Units App
Unit Converter - Pro Units App
Unit Converter - Pro Units App
Convert Any Unit
Free

This app offers a powerful and user-friendly unit converter with 16 categories, including currency, length, and temperature. It allows for custom unit lists and provides live exchange rate updates for 148 currencies. Unlock all features with a one-time in-app purchase.

16 conversion categoriesCustom unit listsLive currency exchange rates
šŸ” Reference
(16K)
free with in-app purchases
6
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
šŸ“š Education
(12K)
free with in-app purchases
7
Convertible: Unit Converter
Convertible: Unit Converter
Convertible: Unit Converter
Currency and Unit Converter
Free

This app offers a comprehensive unit and currency conversion tool with a visually appealing interface and extensive unit options. It supports standard and non-standard units, compound conversions, and fraction input, making it versatile for various needs.

Extensive standard and non-standard unit conversionsCurrency conversion with 161 currenciesCompound unit conversion
šŸ”§ Utilities
(97)
paid
8
Converter+ (Units, Currencies)
Converter+ (Units, Currencies)
Converter+ (Units, Currencies)
Unit and Currency Converter
Free

This app offers a comprehensive unit and currency converter with a vast array of categories and calculators for everyday needs. It allows users to customize templates, download shared ones, and provides automatic exchange rate updates for 167 world currencies.

Extensive unit and currency conversionMultiple calculators (mortgage, loan, tip)Customizable and downloadable templates
šŸ“Š Productivity
(2.3K)
free with in-app purchases
9
Conversion Calculator !
Conversion Calculator !
Conversion Calculator !
Currency, Temperature, Length
Free

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.

Real-time currency conversionsExtensive unit categories (weight, temp, length, volume, etc.)Simple and intuitive interface
āœˆļø Travel
(13K)
free with in-app purchases
10
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
šŸ”§ Utilities
(4.8K)
free with in-app purchases
11
PCalc Lite
PCalc Lite
PCalc Lite
The Best Calculator
Free

This free scientific calculator offers essential features like RPN mode, unit conversions, and multiple undo/redo. It provides a taste of a more powerful version, with optional in-app purchases for expanded functionality.

Optional RPN modeMultiple undo and redoUnit conversions and constants
šŸ”§ Utilities
(213)
free with in-app purchases
12
Currency & Unit Converter #
Currency & Unit Converter #
Currency & Unit Converter #
Scientific Unit Converter
Free

This app offers a comprehensive solution for converting units across more than 20 common categories, including over 400 units. It supports mixed units and currency exchange with real-time updates, making it useful for work, study, and daily life. The app features a scientific calculator and a user-friendly interface.

20+ Categories & 400+ UnitsMixed-Unit SupportCurrency Exchange
šŸ”§ Utilities
(217)
free
13
Unit Converter HD.
Unit Converter HD.
Unit Converter HD.
30 categories, 700+ units
Free

Easily convert over 700 units across 30 categories with this powerful tool. It offers a user-friendly interface, dark mode support, and a backspace key for quick corrections. Save time on all your measurement conversion needs.

700+ Units of Measure30 Conversion CategoriesEasy-to-Use Interface
šŸ”§ Utilities
(642)
free with in-app purchases
14
Unit Converter: Mila's Tools
Unit Converter: Mila's Tools
Unit Converter: Mila's Tools
Metric Conversion Calculator +
Free

This app offers a comprehensive unit conversion tool with over 300 units across 27 categories. It supports compound units, date calculations, and conversions between various number systems, including historical units. The interface is designed for ease of use with smart keyboards and customizable display options.

27 conversion categories300+ unitsCompound unit support
šŸ”§ Utilities
(1.4K)
free with in-app purchases
15
Engineering Unit Converter
Engineering Unit Converter
Engineering Unit Converter
by Vector 254 LLC
Free

This app offers a powerful and user-friendly way to convert units and currencies. It includes a built-in calculator, mass/mole fraction converter, thermocouple module, and physical constants database. Customize your display and input mathematical expressions for complex conversions.

Unit conversionCurrency conversionBuilt-in calculator
šŸ” Reference
(83)
free with in-app purchases
16
Calculator XLt
Calculator XLt
Calculator XLt
5 in 1 Calculator
Free

This app combines five essential calculation tools into one convenient package. It offers standard, scientific, unit conversion, loan, and tip calculators with a user-friendly interface and large buttons. Available on multiple Apple devices, it streamlines everyday calculations.

Standard CalculatorScientific CalculatorUnit Converter
šŸ“Š Productivity
(577)
free with in-app purchases
17
Converter-Universal Conversion
Converter-Universal Conversion
Converter-Universal Conversion
by Trelleborg Sealing Solutions
Free

This app offers a comprehensive unit and hardness conversion tool with an easy-to-use interface. It includes currency conversion with updated exchange rates, over 300 engineering and scientific units, and a specialized hardness converter. Additional features like timezone conversion, pace calculation, and a standard calculator enhance its utility.

Currency converter with live exchange ratesOver 300 engineering and scientific unitsSpecialized hardness converter
šŸ”§ Utilities
(897)
free
18
FP Scientific&Basic Calculator
FP Scientific&Basic Calculator
FP Scientific&Basic Calculator
Currency & Unit Converter
Free

This app offers a versatile calculator with basic arithmetic, currency, and unit conversion capabilities. It features customizable interfaces, including dark mode, and supports split-screen functionality on iPads. Users can also track calculation history and split bills.

Basic and arithmetic calculationsCurrency conversion (160 currencies)Unit conversion (10 units)
šŸ”§ Utilities
(651)
free
19
Feet and Inches Calculator
Feet and Inches Calculator
Feet and Inches Calculator
Perfect Construction Calc!
Free

A powerful construction calculator designed for tradespeople. It offers a wide range of tools for estimating, layout, framing, and jobsite calculations, helping to save time and improve accuracy. Supports both imperial and metric units.

Construction math and estimatingLayout, framing, and jobsite calculationsImperial and metric unit conversion
šŸ”§ Utilities
(384)
free with in-app purchases
20
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
šŸ”§ Utilities
(3.1K)
free with in-app purchases