Best Water Flow Calculators Apps

218+ iOS apps curated and reviewed

4.3 avg rating
18 free apps
Updated May 2026

Looking for free water flow calculators apps? 18 of our 218+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Top Picks for Water Flow Calculators

Water Flow Calculators#1

Water Flow Calculators by Waterous

Editor's Choice
📚 Education
4.6(5 ratings)
Free
Water Flow Calculators screenshot 1
Water Flow Calculators screenshot 2
Water Flow Calculators screenshot 3
Water Flow Calculators screenshot 4
Water Flow Calculators screenshot 5

This application calculates water flow using various formulas, including Friction Loss, Smooth Nozzle, NFA, and Iowa Formulas, providing essential calculations for water flow analysis. Try it out to accurately determine water flow rates and make informed decisions.

Pipe Flow Wizard - Calculator#2

Pipe Flow Wizard - Calculator by Daxesoft Ltd

Flow Rate & Pressure Loss Calc
Strong Contender
🔧 Utilities
4.5(98 ratings)
FreeIn-App Purchases
Pipe Flow Wizard - Calculator screenshot 1
Pipe Flow Wizard - Calculator screenshot 2
Pipe Flow Wizard - Calculator screenshot 3
Pipe Flow Wizard - Calculator screenshot 4
Pipe Flow Wizard - Calculator screenshot 5
Pipe Flow Wizard - Calculator screenshot 6

This fluid flow rate and pressure loss calculator app helps engineers perform calculations for pipe systems, including flow rate, pressure drop, pipe diameter, and maximum pipe length, for both liquid and gas flow. Download the app to easily calculate and share results, and consider a subscription for full access to all features and no calculation restrictions.

Flow Conversions#3

Flow Conversions by Jeff Evans

Water flow conversions
Worth Considering
🔧 Utilities
5.0(1 ratings)
Free
Flow Conversions screenshot 1
Flow Conversions screenshot 2
Flow Conversions screenshot 3

This application allows users to easily convert water flow rates between various units of measure. Try it out to calculate flow rates quickly and efficiently.

More Water Flow Calculators apps to explore

4
Pipe Flow Liquid Flow Rate
Pipe Flow Liquid Flow Rate
Pipe Flow Liquid Flow Rate
Find Flow, Friction Loss Calc
Free

This application calculates fluid flow rates in pipes, taking into account pressure loss, friction losses, and fitting losses, and provides comprehensive results with detailed information. Engineers can use it to perform flow rate calculations, generate professional reports, and save results, with features including customizable units, user-definable materials and fluids, and verification against published data.

🔧 Utilities
(4)
5
Elkhart Hard Facts Calculator
Elkhart Hard Facts Calculator
Elkhart Hard Facts Calculator
by Elkhart Brass
Free

This application provides a comprehensive set of calculators for accurate flow testing, including various nozzle reactions, pump discharge pressures, and fire flow formulas, all in one easy-to-use tool. Download the application to streamline your calculations and access helpful video tutorials on flow testing and more.

🔧 Utilities
(12)
6
Flow Test Calculator
Flow Test Calculator
Flow Test Calculator
by Larry Owens
Free

This app helps users calculate flow rates of hydrants and determine the maximum flow of a water system using a standard variation of the Hazen-Williams formula. Try it out to easily assess your water system's flow capabilities.

📊 Productivity
(63)
7
Bell & Gossett - SystemSyzer
Bell & Gossett - SystemSyzer
Bell & Gossett - SystemSyzer
by Xylem Inc.
Free

This HVAC tool helps with piping system design, offering various calculators for friction loss, velocity, and fluid conditions, as well as tools for valve settings and flow determination. Try it out to streamline your system design and balance processes.

🔍 Reference
(7)
8
Air Velocity and Flow Calc
Air Velocity and Flow Calc
Air Velocity and Flow Calc
by Dwyer Instruments, Inc.
Free

This application quickly calculates air velocity and flow using data from Pitot Tubes, supporting both US and Metric units. Try it out to make spot checking a breeze.

🔧 Utilities
(4)
9
OneCalc: All-in-one Calculator
OneCalc: All-in-one Calculator
OneCalc: All-in-one Calculator
Calculates everything. Try it.
Free

A versatile calculator app for iPhone and iPad offering over 40 calculators and unit converters for finance, health, and more. Simplify your calculations with just one app today!

📊 Productivity
(4.8K)
10
Pipe Flow Liquid Pressure Drop
Pipe Flow Liquid Pressure Drop
Pipe Flow Liquid Pressure Drop
Find Loss, Friction Loss Calc
Free

This application calculates friction loss and fitting loss results for liquid pressure drop in pipes, using the Darcy-Weisbach equation and providing comprehensive results, including Reynolds number and fluid velocities. Try it out today and perform accurate pressure drop calculations on site or in the office, with the ability to generate professional reports and save results for future reference.

🔧 Utilities
(12)
11
TELEDYNE ISCO FlowCalc
TELEDYNE ISCO FlowCalc
TELEDYNE ISCO FlowCalc
by FutureSight Studios Ltd
Free

Calculate flow rates for water and wastewater with our specialized application tailored for professionals in the field. Optimize your workflow and streamline your calculations today!

🔧 Utilities
(2)
12
Fluid Mechanics Calculator
Fluid Mechanics Calculator
Fluid Mechanics Calculator
97 Calculators in SI and USCS
$2.99

This application provides a comprehensive collection of calculators for fluid mechanics and civil engineering, offering 97 tools to compute various parameters in both SI and USCS units. With this tool, users can perform accurate calculations and conversions for a wide range of applications, from fluid flow rates and pressure to pipe stress and water horsepower.

🔧 Utilities
(21)
13
Water Demand Calculator
Water Demand Calculator
Water Demand Calculator
Calculate Peak Water Demand
Free

This tool helps accurately size water supply systems by predicting peak flow rates based on water-efficient fixtures and appliances. It allows users to calculate peak water demand by selecting fixtures, adjusting flow rates, and choosing units of measure, with the option to save and share results.

📚 Education
(5)
14
ERG 2020
ERG 2020
ERG 2020
by National Library of Medicine
Free

This application provides first responders with a critical resource to handle hazmat accidents, offering guidance on safety precautions and response procedures for various hazardous materials. It allows users to quickly identify materials and access recommended actions, making it an essential tool for emergency situations.

🔍 Reference
(53)
15
EyeOnWater
EyeOnWater
EyeOnWater
Making Water Visible.
Free

EyeOnWater helps you monitor water usage, detect leaks, and track usage trends. Connect with your water utility account to access detailed usage data and take steps to reduce water waste. Get the app now and make your water consumption visible.

🔧 Utilities
(38K)
16
Calculator HD Pro
Calculator HD Pro
Calculator HD Pro
Basic & Scientific Calc
$9.99

A powerful calculator app for all your mathematical needs, featuring advanced functions, intuitive interface, and customizable settings. Download now for a seamless calculation experience.

🔧 Utilities
(11K)
17
Flume Water
Flume Water
Flume Water
by Flume, Inc.
Free

Flume Water is an app that pairs with a water sensor on your meter, allowing users to manage, monitor, and conserve water usage. Detect leaks, track detailed water data, and save money with Flume's budget suggestions and leak alerts. Install easily without plumbing - visit the website to get started today.

🌟 Lifestyle
(1.4K)
18
Big Button Calculator Pro Lite
Big Button Calculator Pro Lite
Big Button Calculator Pro Lite
Easy Basic Calculator
Free

Experience the ultimate iOS calculator with big buttons, dual-line display, 18 color themes, and multi-line input for complex equations. Includes convenient gestures like swipe to backspace and clear. Perfect for all your calculating needs!

🔧 Utilities
(13K)
19
Calculator HD Pro Lite
Calculator HD Pro Lite
Calculator HD Pro Lite
Basic & Scientific Calc
Free

A professional-grade calculator app designed for quick and accurate mathematical calculations on-the-go. Upgrade to the full version for advanced features and functionalities.

🔧 Utilities
(51K)
20
Calculator‰
Calculator‰
Calculator‰
Default Calculator
Free

Experience a beautifully designed calculator with large buttons and a clear display for quick and efficient calculations. Try it now to discover the simplicity and ease of use for your everyday arithmetic needs.

🔧 Utilities
(404K)