Easily convert liquid volumes between US gallons and liters. This utility allows you to select your preferred number of decimal places for precise conversions.



181+ iOS apps curated and reviewed
If you already know Gallons and Liters, this is the deeper bench. 181+ gallons and liters apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of July 2026.





Easily convert liquid volumes between US gallons and liters. This utility allows you to select your preferred number of decimal places for precise conversions.





This app provides a comprehensive unit and currency converter with a user-friendly interface. It offers offline functionality, supports over 30,000 unit conversions, and includes more than 160 currencies with live exchange rates. Users can save favorite conversions and get precise results.


This app provides essential data and calculators for oil and gas well calculations. Access key dimensions, strengths, and specifications for tubulars to quickly determine volumes and capacities. Supports multiple unit systems for flexible calculations.


Instantly view real-time tank levels on your smartphone, eliminating guesswork. Track usage history, receive low-level alerts, and easily request refills from your fuel supplier. Manage multiple tanks and share access with others.


Monitor your home's water consumption with this app. View detailed usage history, identify leaks, and understand your water usage trends. Connect to your supported water utility account to make your water usage visible.


This app helps you maintain regular hydration by calculating your daily water intake needs and sending timely reminders. It offers statistics, motivational awards, and useful tips to encourage healthy fluid consumption. Integration with Apple Watch and Apple Health enhances its functionality.


This application helps users calculate their fuel consumption and associated costs. It utilizes standard units commonly used in the USA, such as miles, dollars, and U.S. gallons.


Monitor and manage your home's water usage with real-time data and leak detection. This app helps you understand your consumption, set budgets, and receive alerts to prevent costly water damage.




Easily convert between 76 measurement units across eight common types, including length, weight, temperature, and volume. Features a built-in calculator and optional currency conversion with daily exchange rate updates.


This tool quickly determines refrigerant data, including properties, safety groups, GWP, and ODP. It offers intuitive temperature-to-pressure conversion and supports both metric and imperial units. Access detailed information and links to online resources for over 100 refrigerants.


Calculate fuel density at 15°C and determine tank volume using cm readings. Supports standard tank sizes and allows custom dimensions for precise dip calculations.




Manage your personal water usage and set goals to conserve. Compare your consumption with neighbors and access utility announcements and rebates. Save water, time, and money with this mobile portal.


This app provides fast and precise conversions for a wide range of liquid, dry, and cubic volume units. It supports metric, US customary, US dry, UK imperial, and various other measurement systems, including compound conversions. The interface is clean and intuitive, with features like favorites and light/dark modes.


This app offers a streamlined unit conversion experience, focusing on clarity and ease of use. It avoids common frustrations found in other converters by clearly displaying unit names and abbreviations, and by offering a simple, intuitive interface. Convert everyday units like length, weight, and temperature with confidence.


This tool simplifies HVAC/R technician tasks by calculating pressure/temperature relationships, superheat, and subcool. It automatically adjusts for altitude and offers English/Metric units. Easily access favorite refrigerants and supplementary information.


Easily convert between over 260 measurement units across 22 categories and get real-time currency exchange rates for more than 160 currencies. Quickly find units or bookmark frequent conversions for efficient use.


Calculate the volume of various tank shapes with precision and ease. This user-friendly tool supports a wide range of tank types and units, making it ideal for professionals and DIY enthusiasts alike. It offers advanced algorithms for accuracy and is optimized for efficiency on your device.