# Ship Squat Calculator

> Calculates ship squat, sinkage, and trim using empirical formulas for channel navigation. (iPhone/iPad app by SHIPPING TECHNOLOGIES LTD.)

- Source: https://appshunter.io/ios/app/ship-squat-calculator/id1362778887 (this page in markdown: same URL + `.md`)
- Developer: [SHIPPING TECHNOLOGIES LTD](https://appshunter.io/developer/1099191625)
- Category: Utilities, Navigation
- Price: $4.99
- Rating: 2.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 10.0 · 7 MB
- Languages: English
- Released: 2018-03-25
- Data updated: 2026-07-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ship-squat-calculator/id1362778887/reviews.md

## What is Ship Squat Calculator?

Squat is the reduction in underkeel clearance (UKC) between a vessel at-rest and underway due to the increased flow of water past the moving hull. The forward motion of the ship pushes water ahead of it that must return around the sides and under the keel. This water motion induces a
relative velocity between the ship and the surrounding water that causes a water level depression in which the ship sinks. The velocity field produces a hydrodynamic pressure change along the ship similar to the Bernoulli effect. This phenomenon produces a downward vertical force (sinkage,
positive downward) and a moment about the transverse axis (trim, positive bow up) that can result in different values of squat at the bow and stern. This combination of sinkage and change in trim is called ship squat.

There have been several grounding incidents related to squat and its effect should never go unnoticed. This App takes into account the vessel/channel particulars and calculates the ship’s squat using Ankudinov’s empirical formula, which is one of the most conservative formulas for squat compared to those recommended by PIANC and is particular used in channel depth design. The App also determines the final trim of the ship.

The App determines the channel types (Confined Channel, Restricted Channel, Unrestricted Channel) using Barrass’s equation for ‘Width of Influence’ and comparing it with the bottom width of the channel. It also determines the Critical and Economic speed of the vessel transiting the channel that should not be exceeded.

The App can be used for estimating squat for channel design and operational use. It also takes into account transiting ships in the channel.

## Key features

- Ship squat calculation
- Underkeel clearance estimation
- Sinkage and trim determination
- Channel type classification
- Critical and economic speed calculation
- Ankudinov's empirical formula
- Barrass's equation for Width of Influence


## Frequently asked questions about Ship Squat Calculator

### What is Ship Squat Calculator?

Ship Squat Calculator is a paid utility app designed to calculate ship squat, which is the reduction in underkeel clearance when a vessel is underway. It uses empirical formulas to estimate sinkage and trim, aiding in safe channel navigation and design.

### How does Ship Squat Calculator work?

The app utilizes Ankudinov’s empirical formula to calculate ship squat, considering vessel and channel particulars. It also determines the final trim of the ship and classifies channel types using Barrass’s equation.

### What is the price of Ship Squat Calculator?

Ship Squat Calculator is a paid application, available for $4.99. There are no in-app purchases or subscription fees associated with its use.

### What devices is Ship Squat Calculator compatible with?

Ship Squat Calculator is available for iPhone and iPad devices. It is designed for iOS users who need to perform these specific maritime calculations.

### When was Ship Squat Calculator last updated?

The latest version of Ship Squat Calculator was released on June 16, 2020. The initial release date for the application was March 25, 2018.

### What is the age rating for Ship Squat Calculator?

Ship Squat Calculator has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content restrictions.

### Does Ship Squat Calculator have ads?

The provided data does not specify whether Ship Squat Calculator contains advertisements. As a paid application, it is common for such apps to be ad-free.

### What is the user feedback on Ship Squat Calculator?

Ship Squat Calculator has a rating of 2.0 stars based on one review. This suggests that current user sentiment may be mixed or that there is limited feedback available.

## Version history (last 2 releases)

### 1.1 — 2020-06-16

Minor bug fixes.

### 1.0 — 2018-03-25

No release notes.

## Apps similar to Ship Squat Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Stop Calls Get Cash - Personal Lawyer \| Know Your Rights!](https://appshunter.io/ios/app/stop-calls-get-cash-personal-lawyer-know-your-rights/id905106068) | 4.1 (24) | Free | Utilities |
| [Timber Engineering Calculator](https://appshunter.io/ios/app/timber-engineering-calculator/id646321927) | 3.9 (7) | $3.99 | Utilities |
| [CG Wizard](https://appshunter.io/ios/app/cg-wizard/id1219661845) | 5.0 (1) | Free | Utilities |
| [MobiCam PET](https://appshunter.io/ios/app/mobicam-pet/id1448441269) | 3.3 (3) | Free | Utilities |
| [Centauri Connect](https://appshunter.io/ios/app/centauri-connect/id1475753041) | — | Free | Utilities |
| [Home Control Pocket Plus](https://appshunter.io/ios/app/home-control-pocket-plus/id586300603) | 4.0 (3) | Free | Utilities |

## More apps by SHIPPING TECHNOLOGIES LTD

- [True Wind](https://appshunter.io/ios/app/true-wind/id1099191626)
- [Tug Requirements for Ships](https://appshunter.io/ios/app/tug-requirements-for-ships/id1288179710)
- [Ship Channel Configurator](https://appshunter.io/ios/app/ship-channel-configurator/id1448509860)
- [LNG Densities and Energy calc](https://appshunter.io/ios/app/lng-densities-and-energy-calc/id1483234859)

All apps by SHIPPING TECHNOLOGIES LTD: https://appshunter.io/developer/1099191625

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*