# Grains: Archery Calculator

> Archery calculator for arrow weight, FOC, speed, and energy. (iPhone/iPad app by 37 South, LLC.)

- Source: https://appshunter.io/ios/app/grains-archery-calculator/id1573880326 (this page in markdown: same URL + `.md`)
- Developer: [37 South, LLC](https://appshunter.io/developer/1545527076)
- Category: Sports, Utilities
- Price: $1.99
- Rating: 4.33/5 from 6 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 1 MB
- Languages: English
- Released: 2021-06-27
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/grains-archery-calculator/id1573880326/reviews.md

## What is Grains?

Grains is a simple archery calculator that makes it convenient to calculate a few important numbers like total weight, FOC (front of center), speed, and energy.

Total Weight: When building an arrow, you're working with many small components with various weights. Grains helps you keep track of each component's weight and see your total arrow weight and how individual components will affect it.

FOC: Your arrow build's front of center percentage is an important factor when it comes to building an accurate hunting arrow. It's a relatively simple calculation to do, but Grains makes it even easier, even offering some advice for an ideal setup and the how-to of getting an accurate measurement.

Speed: Arrow speed is another factor that's important in building the perfect arrow. The slower the arrow, the more likely you are to experience game "jumping the string." Grains uses a standard formula to calculate an estimate of how your bow setup and arrow build might be performing.

Energy: A fast arrow with good FOC is only good if it carries enough energy. Arrow weight and speed can give you the total energy that your arrow will carry, and Grains will also show you what game your arrow build works for.

## Key features

- Calculate total arrow weight
- Determine FOC percentage
- Estimate arrow speed
- Calculate arrow energy
- Advice for ideal arrow setups
- Game suitability recommendations

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/grains-archery-calculator/id1573880326/reviews.md

### 1/5 — Pass

*2024-11-14*

Literally nothing on the app works , you cannot put any info in pass on this

### 1/5 — Not user friendly

*2024-09-19*

I tap and tap and tap and it does not allow me to input data until messing with where and how I tap on each input section. Further does not allow you to save or keep data in the fields and auto resets clearing information inputed. Should also transfer data from tab to tab instead you have to put duplicate information in. Not worth the money dont mess with this app doe not function as intended not user friendly.

### 5/5 — Exactly what I was looking for

*2021-06-27*

I’ve been looking for a simple calculator for my arrows. This does that and more, and it’s so simple to use.

## Frequently asked questions about Grains

### What is Grains used for?

Grains is used to calculate key archery metrics such as total arrow weight, FOC (front of center), arrow speed, and energy. It helps archers build and optimize their arrows for accuracy and hunting effectiveness.

### How much does Grains cost?

Grains is a paid application, available for $1.99. This one-time purchase grants you access to all its features for calculating arrow performance.

### What devices does Grains support?

Grains is available for iPhone and iPod devices. It is designed for iOS users who engage in archery.

### Is Grains suitable for beginners?

Yes, Grains simplifies complex calculations like FOC and provides advice for ideal setups, making it beneficial for both beginner and experienced archers looking to improve their arrow builds.

### How often is Grains updated?

The latest version of Grains was released on September 6, 2023. Updates ensure the app remains functional and accurate for its users.

### What is the age rating for Grains?

Grains has an age rating of 4+, indicating it is suitable for users of all ages. The app's content is appropriate for a wide audience.

### Does Grains have ads?

No, Grains is ad-free. As a paid application, it provides an uninterrupted user experience without any advertisements.

### What is the user sentiment for Grains?

Grains has a positive user sentiment, reflected in its rating of 4.3 stars from 6 ratings. Users appreciate its convenience in calculating important archery metrics.

## Version history (last 2 releases)

### 1.1 — 2023-09-06

Bug fixes and improvements.

### 1.0 — 2021-06-27

No release notes.

## Apps similar to Grains

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| --- | --- | --- | --- |
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| [PRO Archery Ballistics](https://appshunter.io/ios/app/pro-archery-ballistics/id6503086578) | 4.8 (14) | Free | Sports |
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## More apps by 37 South, LLC

- [Shooting Light: Hunt Clock](https://appshunter.io/ios/app/shooting-light-hunt-clock/id1553587857)
- [Milkweed: Hunting Weather](https://appshunter.io/ios/app/milkweed-hunting-weather/id1557374678)
- [Patterns: Trail Cam Log](https://appshunter.io/ios/app/patterns-trail-cam-log/id1577629028)
- [Vitals: Hunt Packing List](https://appshunter.io/ios/app/vitals-hunt-packing-list/id6471925715)

All apps by 37 South, LLC: https://appshunter.io/developer/1545527076

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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 2026-06-10.*