# Iron sight adjustment calc — Twist rate calculator and IS

> Firearms iron sight adjustment and twist rate calculator. (iPhone/iPad app by Michil Khodulov.)

- Source: https://appshunter.io/ios/app/iron-sight-adjustment-calc/id1212645223 (this page in markdown: same URL + `.md`)
- Developer: [Michil Khodulov](https://appshunter.io/developer/1190776633)
- Category: Utilities, Productivity
- Price: Free
- Rating: 4.00/5 from 1 App Store ratings
- Age rating: 12+
- Requires: iOS 11.0 · 11 MB
- Languages: English
- Released: 2017-03-21
- Data updated: 2026-07-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/iron-sight-adjustment-calc/id1212645223/reviews.md

## What is Iron sight adjustment calc?

App will help you to adjust iron sight and determine optimal ammunition or twist rate which perfectly suits your gun.
Includes the metric system and the imperial system converter.
Example: 
at 100 yards, your shot is 6" low and the distance between your front and rear sight is 19.5".
Since you are shooting low, you would need to lower your front sight by .032".

* For rifles, you measure the front sight height from the bottom of the dovetail to the top of the sight. For pistols you measure the height of the blade only. This is true unless stated otherwise in the sight specifications.

To calculate stability factor (SG) you need to enter parameters of the bullet: weight, caliber (diameter), length, velocity,  and twist rate (will be calculated for a standard ambient temperature of 59°F / 15°C, atmospheric pressure 750 mm Hg. humidity 78%).
If SG is less than 1.0, the bullet will not have adequate stability.
Between 1.0 and 1.5 marginal stability.
SG of 1.5 or greater ensures adequate stability.

## Key features

- Iron sight adjustment calculation
- Optimal ammunition determination
- Twist rate calculation
- Metric and imperial system conversion
- Bullet stability factor calculation


## Frequently asked questions about Iron sight adjustment calc

### How do I adjust iron sights using the calculator?

The app helps you determine the necessary adjustment based on your shot's deviation and sight radius. For example, if you're shooting low, it will tell you how much to lower your front sight.

### What information is needed to calculate bullet stability?

To calculate stability factor (SG), you need to input the bullet's weight, caliber, length, velocity, and twist rate. The app assumes standard ambient conditions for these calculations.

### What does the stability factor (SG) mean?

An SG of 1.0 or less indicates inadequate bullet stability. Between 1.0 and 1.5 suggests marginal stability, while 1.5 or greater ensures adequate stability for your firearm.

### Does Iron sight adjustment calc support both measurement systems?

Yes, the app includes converters for both the metric system and the imperial system, allowing for flexible use regardless of your preferred measurements.

### What is the age rating for Iron sight adjustment calc?

Iron sight adjustment calc has an age rating of 12+, making it suitable for users aged 12 and above.

### When was the last update for Iron sight adjustment calc?

The latest version of Iron sight adjustment calc was released on September 25, 2019, with version 1.2.1.

### What devices is Iron sight adjustment calc available on?

Iron sight adjustment calc is available for iPhone, iPad, and iPod devices.

### What is the user rating for Iron sight adjustment calc?

Iron sight adjustment calc has a rating of 4.0 stars based on one review.

## Version history (last 1 release)

### 1.2.1 — 2019-09-25

iOS Dark mode support.
UI fixes.

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All apps by Michil Khodulov: https://appshunter.io/developer/1190776633

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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 2026-07-07.*