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
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This educational app provides calculations for water flow using friction loss, smooth nozzle, NFA, and Iowa formulas. It's designed for professionals and students needing quick and accurate fluid dynamics computations.

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
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Calculate fluid flow rate and pressure loss in pipes. This app helps engineers determine pipe diameter, maximum pipe length, and friction loss for both liquid and gas flows, including fittings and elevation changes. Results can be shared as Excel or PDF reports.

Flow Conversions#3

Flow Conversions by Jeff Evans

Water flow conversions
Worth Considering
🔧 Utilities
5.0(1 ratings)
Free
Flow Conversions screenshot 1
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Easily convert water flow rates between various units of measurement. This utility app provides a straightforward way to calculate and understand different flow rate values.

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

Calculate fluid flow rate in pipes, including friction and fitting losses, using accurate engineering equations. Features extensive databases for liquids, pipes, and fittings, with customizable units and reporting options.

Fluid flow rate calculationFriction and fitting loss calculationExtensive material and fluid databases
🔧 Utilities
(4)
free with in-app purchases
5
Elkhart Hard Facts Calculator
Elkhart Hard Facts Calculator
Elkhart Hard Facts Calculator
by Elkhart Brass
Free

This utility app provides essential calculators for accurate flow testing, covering various nozzle types, pump discharge pressures, and fire flow formulas. It also includes direct links to helpful instructional videos.

Smooth Bore Discharges & Flow/Pressure calculatorNozzle Reaction calculators (Smooth Bore & Fog)Pump Discharge Pressure calculators
🔧 Utilities
(12)
free
6
Flow Test Calculator
Flow Test Calculator
Flow Test Calculator
by Larry Owens
Free

Calculate hydrant flow rates and determine maximum water system flow. This tool uses a standard variation of the Hazen-Williams formula for calculations. Imperial units are currently supported, with metric coming soon.

Hydrant flow rate calculationMaximum water system flow determinationHazen-Williams formula implementation
📊 Productivity
(63)
free with in-app purchases
7
Bell & Gossett - SystemSyzer
Bell & Gossett - SystemSyzer
Bell & Gossett - SystemSyzer
by Xylem Inc.
Free

This HVAC tool aids in piping system design, offering calculators for friction loss, velocity, and heat load. It includes a Cv tool and a specialized calculator for balancing contractors to determine valve settings and flow rates.

Friction loss and velocity calculatorHeat/cooling load calculationCv tool
🔍 Reference
(7)
free
8
Air Velocity and Flow Calc
Air Velocity and Flow Calc
Air Velocity and Flow Calc
by Dwyer Instruments, Inc.
Free

This utility app simplifies air velocity and flow calculations using Dwyer Pitot Tubes. It supports both US and Metric units for quick spot checks.

Air velocity calculationAir flow calculationPitot tube support
🔧 Utilities
(4)
free
9
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
10
Pipe Flow Liquid Pressure Drop
Pipe Flow Liquid Pressure Drop
Pipe Flow Liquid Pressure Drop
Find Loss, Friction Loss Calc
Free

This app calculates friction and fitting losses in liquid flow systems using the Darcy-Weisbach equation. It offers extensive databases for fluids, pipes, and fittings, with customizable units and reporting options. Verified against published data, it's designed for engineers needing accurate pressure drop calculations.

Friction and fitting loss calculationsDarcy-Weisbach equation with Colebrook-WhiteIntegrated databases for fluids, pipes, and fittings
🔧 Utilities
(12)
free with in-app purchases
11
TELEDYNE ISCO FlowCalc
TELEDYNE ISCO FlowCalc
TELEDYNE ISCO FlowCalc
by FutureSight Studios Ltd
Free

This utility app provides quick and accurate open channel flow rate calculations for field or office use. Select your measurement method, enter dimensions and head/velocity, and receive instant results. It supports multiple flow methods, area-velocity calculations, and unit switching.

Instant flow rate calculationsMultiple weir and flume typesArea-velocity mode for pipes
🔧 Utilities
(2)
ad-supported
12
Fluid Mechanics Calculator
Fluid Mechanics Calculator
Fluid Mechanics Calculator
97 Calculators in SI and USCS
$2.99

This app provides 97 calculators for fluid mechanics and civil engineering parameters. It supports both Imperial (USCS) and Metric (SI) units, offering automatic and accurate calculations with unit changes.

97 fluid mechanics and civil engineering calculatorsSupports SI and USCS (Imperial) unitsAutomatic calculations with unit changes
🔧 Utilities
(21)
paid
13
Water Demand Calculator
Water Demand Calculator
Water Demand Calculator
Calculate Peak Water Demand
Free

This tool helps engineers and plumbers accurately size water systems by calculating peak water demand. It accounts for water-efficient fixtures and appliances, allowing for custom flow rate adjustments and the addition of unlisted fixtures. Results can be saved and emailed.

Accurate system sizingAccounts for water-efficient fixturesCustomizable flow rates
📚 Education
(5)
free
14
ERG 2020
ERG 2020
ERG 2020
by National Library of Medicine
Free

This app provides first responders with critical information for hazmat accidents. It offers an indexed list of dangerous goods, their hazards, and safety precautions to guide immediate response efforts.

Indexed list of dangerous goodsAssociated ID numbersGeneral hazard information
🔍 Reference
(53)
free
15
EyeOnWater
EyeOnWater
EyeOnWater
Making Water Visible.
Free

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.

View recent water usage with comparisonDetailed usage history (day, week, month, year)Discover usage trends
🔧 Utilities
(38K)
free
16
Calculator HD Pro
Calculator HD Pro
Calculator HD Pro
Basic & Scientific Calc
$9.99

This app offers a powerful and customizable calculator experience with a dual-line display for seeing input and results simultaneously. Save and organize your calculations with history, labeling, and email options. Personalize layouts, themes, and fonts for a comfortable and efficient user experience.

Dual-line displayMulti-line inputCalculation history
🔧 Utilities
(11K)
free with in-app purchases
17
Flume Water
Flume Water
Flume Water
by Flume, Inc.
Free

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.

Real-time water usage dataLeak detection and alertsWater consumption budgeting
🌟 Lifestyle
(1.4K)
free with in-app purchases
18
Big Button Calculator Pro Lite
Big Button Calculator Pro Lite
Big Button Calculator Pro Lite
Easy Basic Calculator
Free

A user-friendly calculator app featuring large buttons and customizable colorful backgrounds. It offers a dual-line display, multi-line input for complex equations, and convenient gesture controls for editing and copying.

Large buttonsDual-line display18 color themes
🔧 Utilities
(13K)
ad-supported
19
Calculator HD Pro Lite
Calculator HD Pro Lite
Calculator HD Pro Lite
Basic & Scientific Calc
Free

This app offers a user-friendly calculator with large buttons and extensive customization options. It features a dual-line display to see input and results simultaneously, saves your calculation history, and provides full scientific functions. Personalize layouts, themes, and even button symbols to suit your needs.

Dual-line displayCalculation historyFull scientific functions
🔧 Utilities
(51K)
ad-supported
20
Calculator‰
Calculator‰
Calculator‰
Default Calculator
Free

This utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.

Large buttonsClear displayFast calculations
🔧 Utilities
(404K)
ad-supported