# Flow Test Calculator

> Productivity

Canonical page: [https://chrome-stats.com/d/id853530759](https://chrome-stats.com/d/id853530759)

## Overview

- **ID:** `id853530759`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Larry Owens
- **Category:** Productivity
- **Rating:** 4.10 / 5 (63 ratings)
- **Version:** 2.0
- **Last updated:** 2021-09-01
- **First published:** 2014-04-18
- **Size:** 1.55 MB
- **Data as of:** 2026-09-19
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/flow-test-calculator/id853530759)
- **Privacy policy:** [http://www.cookiejardevelopment.com/privacy-policy/](http://www.cookiejardevelopment.com/privacy-policy/)

## Description

Flow Test Calculator is a simple Chrome extension that helps you determine hydrant flow rates and the maximum flow available in a water system. It uses a standard variation of the Hazen-Williams formula to produce quick, on-device results.

All units are Imperial (Metric support coming soon), making it a practical tool for fieldwork and engineering planning.

## Rankings

- #168,106 — Overall

## Review summary

Users praise Flow Test Calculator for ease of use and field usefulness for hydrant and pump flow calculations, often using it daily. However, multiple reviews report it stops working after iOS updates, with issues across iOS 14.x versions. The main concern is the need for timely developer updates to maintain compatibility and reliability in the field.

### Pros

- Easy to use with a simple, intuitive interface.
- Field-ready tool for fire hydrant and pump flow testing.
- Used daily for work; praised as reliable and versatile.
- Versatile for different flow calculations and scenarios.

### Cons

- iOS compatibility issues after updates; the app won't open or read results on newer iOS versions (examples include iOS 14.x, 14.5, 14.6 and devices like iPhone 12).
- Ongoing maintenance is needed; users repeatedly request updates to keep the app functioning with current iOS versions.

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- [HyTools](https://chrome-stats.com/d/id537674477) — 4.00 / 5
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Source: [Chrome-Stats](https://chrome-stats.com/d/id853530759)