# Engine Calculator Plus — Engine Specs Calculations

> Calculate engine displacement, compression ratio, and horsepower for various engine types. (iPhone/iPad app by Nitrio.)

- Source: https://appshunter.io/ios/app/engine-calculator-plus/id1355990764 (this page in markdown: same URL + `.md`)
- Developer: [Nitrio](https://appshunter.io/developer/321121189)
- Category: Productivity, Utilities
- Price: $2.99
- Rating: 4.00/5 from 1 App Store ratings · 8 written reviews indexed
- Age rating: 4+
- Requires: iOS 13 · 2 MB
- Languages: American English
- Released: 2018-03-08
- Data updated: 2026-08-22
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/engine-calculator-plus/id1355990764/reviews.md

## What is Engine Calculator Plus?

Engine Calculator Plus is designed to help you figure out engine specs for all car or plane engine types from inline 4 to V12 Engine.
This calculator provides calculations for engine displacement based on either the metric or US standard system.

Features:
- User friendly UI
- Engine type selection from single cylinder to complex W16 or even custom cylinder count.
- Display 3D engine from selection
- Metric or Imperial input
- Output Engine Displacement on cc, liter and cubic inch 
- Output Compression ratio of engine
- Calculate estimate horse power in HP and Kilowatts
- Include formula to calculate the engine displacement in help page
- Result are copy-able to other app

The engine's static compression ratio is easily calculated if you know six measurements or volumes:
Bore - The diameter of the cylinder bore
Stroke - The distance the piston travels in the cylinder
Deck Height - The distance between the top of the cylinder bore and the top of the piston, when the piston is at TDC (Top Dead Center, or at its highest position)
Piston top volume - If the piston is dished, domed, or dimpled, that has an affect on compression ratio.
Combustion chamber volume - How much open space is in the head above the cylinder

Compression ratios:
Higher compression ratios cylinder produces better power and fuel economy. It is not just because the charge is squeezed harder and the resulting combustion pressure goes up, but also because the higher expansion ratio allows more energy to be extracted from the original high-pressure.
High compression ratio engines burn both much more cleanly and much more efficiently than lower-compression engines. However a lower compression motor will let you run cheap fuel, but your motor won't be as efficient, less efficient and less power.

*Thanks for your support, stay tune for more update to come.

## Key features

- Engine displacement calculation
- Compression ratio calculation
- Horsepower estimation
- Metric and Imperial support
- 3D engine display
- Copyable results

## Recent user reviews (8 of 8)

All indexed reviews: https://appshunter.io/ios/app/engine-calculator-plus/id1355990764/reviews.md

### 1/5 — It’s not working

*2023-07-31*

It’s not working.

### 1/5 — Not enough info can be entered

*2023-06-18*

Does not give enough options to calculate correctly 
You cannot put in head volume cc
I’m a little disappointed with this especially when you have to pay for it

### 1/5 — Garbage

*2021-04-24*

Don’t buy, useless app. Will be pursuing a refund.

### 1/5 — 1:38 compression ratio... I don’t think so

*2020-11-29*

I entered 302 specs at 4” bore 3” stroke and 8.206 deck height and it calculated at nearly 500hp and a 1:38 compression ratio..... yeah, this calculator is inaccurate, waste of money!!

### 4/5 — I wish I could have landscape

*2020-11-03*

That’s my only rub. And it’s not a big one.

### 1/5 — No stars

*2020-01-28*

Waste of £2.99. Does not use combustion chamber volume. Pointless.

### 1/5 — I want my money back.

*2018-10-26*

Can’t do anything on it.

### 1/5 — Would like a refund

*2018-10-23*

The app keeps crashing after 30 seconds of use do not use

## Frequently asked questions about Engine Calculator Plus

### What engine types can Engine Calculator Plus calculate specs for?

Engine Calculator Plus supports a wide range of engine types, from single cylinder to complex W16 configurations, and even custom cylinder counts. This allows for versatile calculations across many automotive and aviation engines.

### Does Engine Calculator Plus support both metric and imperial units?

Yes, Engine Calculator Plus supports both metric and imperial input systems. This ensures flexibility for users worldwide, allowing them to input measurements and receive outputs in their preferred units.

### What specific engine metrics can be calculated?

The app calculates key engine metrics including engine displacement (in cc, liters, and cubic inches), compression ratio, and an estimated horsepower output in HP and Kilowatts. It also provides formulas for displacement calculation in its help section.

### How does Engine Calculator Plus handle engine displacement calculations?

Engine Calculator Plus calculates engine displacement based on user-provided measurements like bore and stroke. It supports both metric and US standard systems for these calculations, outputting results in cc, liters, and cubic inches.

### Can I easily share the calculated engine specs?

Yes, the results from Engine Calculator Plus are copy-able. This feature allows you to easily transfer the calculated engine specifications to other applications for documentation, sharing, or further analysis.

### What is the age rating for Engine Calculator Plus?

Engine Calculator Plus has an age rating of 4+. This indicates it is suitable for a wide audience, including younger users interested in learning about engine mechanics.

### How often is Engine Calculator Plus updated?

The app was last updated on January 3, 2026, with version 1.2. The developer has indicated that more updates are planned, suggesting ongoing support and feature enhancements.

### Does Engine Calculator Plus have ads?

No, Engine Calculator Plus does not contain advertisements. As a paid application, users can expect an uninterrupted experience without any ad interruptions.

## Version history (last 3 releases)

### 1.2 — 2026-01-03

- Updated for the newest devices.
- Minor bugs fixed.

### 1.1 — 2020-09-16

- Update for Newest Devices.
- Bug Fixed.

### 1.0 — 2018-03-07

No release notes.

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All apps by Nitrio: https://appshunter.io/developer/321121189

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*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 2026-08-22.*