# Dilution Calculator

> Utility app for calculating pesticide and fertilizer dilutions. (iPhone/iPad app by Koji Iida.)

- Source: https://appshunter.io/ios/app/dilution-calculator/id955305524 (this page in markdown: same URL + `.md`)
- Developer: [Koji Iida](https://appshunter.io/developer/955305523)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 2.33/5 from 3 App Store ratings · 5 written reviews indexed
- Age rating: 17+
- Requires: iOS 8.1 · 18 MB
- Languages: English, Japanese
- Released: 2015-01-25
- Data updated: 2026-06-11
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/dilution-calculator/id955305524/reviews.md

## What is Dilution Calculator?

This is a calculator-style UI app that perform dilution calculation of pesticide and fertilizer.

Basic functions (Free)
- Calculate amount of pesticide.
- Calculation history management.
- Unit selection.

Premium (In-App Purchase)
- No advertising.
- Additional calculation mode. (Water, Spraying)
- Favorites management.
- Utilize calculation results. (Copy, Print, Message, Mail, ...)

## Key features

- Pesticide amount calculation
- Fertilizer dilution calculation
- Calculation history
- Unit selection
- Additional calculation modes (Water, Spraying)
- Favorites management
- Utilize calculation results (Copy, Print, Message, Mail)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Upgrade | $0.99 | one-time |


## Recent user reviews (5 of 5)

All indexed reviews: https://appshunter.io/ios/app/dilution-calculator/id955305524/reviews.md

### 4/5 — いつも使わせていただいてます！

*2021-04-18, version 1.2*

入力画面もシンプルで非常にわかりやすいです！ひとつだけ、計算したデータをお気に入りに登録する際、最後に右下のenterのボタンを押すと「コピー,お気に入り,マークアップ,プリント....」等が表示されるのですが、その画面になるとフリーズしてしまいます。もし改善できればお願い致します。

### 1/5 — ゴミアプリ

*2016-12-14, version 1.2*

最初のチュートリアルでスワイプして変更してみようとか書いてあるのに変更しようとするとプレミアム版買わないと変更できないとかふざけた仕様になってる。
ゴミアプリ同然。

### 1/5 — Poor.

*2016-06-08*

Have to buy premium to do anything.

### 5/5 — ちゃんと希釈できます。

*2016-01-28, version 1.1*

1)「」のようなガイドが欲しい
「知りたいこと」水量 薬量 散布量
  希釈率「を入力してください」

2) 項目入力ごとにわかりやすい合図が欲しい。
 ex. 希釈率を入力したら画面の色が変わるとか、計算結果がでたら強調する等

3) 散布量計算の面積当たりの使用量に
  L/10平米または、ml/10平米の単位が欲しい

以上があると私の仕事でも使えるので、仲間に勧められます。是非ご検討お願いします。

### 3/5 — 使いやすいですが

*2015-07-27, version 1.0*

使いやすいのでプロ版を購入しましたが、ヘリ防除などでは高濃度での希釈計算が必要なため、小数点の入力にも対応していただきたいです。よろしくお願いします。

## Frequently asked questions about Dilution Calculator

### What are the basic functions of Dilution Calculator?

The basic functions include calculating the amount of pesticide, managing calculation history, and selecting units. These core features are available for free.

### What benefits does the premium version of Dilution Calculator offer?

The premium version provides an ad-free experience, additional calculation modes like Water and Spraying, favorites management, and the ability to utilize calculation results via copy, print, message, or mail.

### How much does Dilution Calculator cost?

The app is free to download and use with basic functions. Premium features are available through in-app purchases.

### Does Dilution Calculator have ads?

The free version of Dilution Calculator contains advertisements. The premium version removes these advertisements.

### What devices is Dilution Calculator compatible with?

Dilution Calculator is supported on iPhone and iPod devices.

### How often is Dilution Calculator updated?

The app was last updated on February 4, 2016, to version 1.2. It was initially released on January 25, 2015.

### What is the age rating for Dilution Calculator?

Dilution Calculator has an age rating of 17+, indicating it may contain content suitable for mature users.

### What is the user sentiment for Dilution Calculator based on ratings?

Based on 3 ratings, Dilution Calculator has an average rating of 2.3 stars, suggesting mixed user satisfaction.

## Version history (last 3 releases)

### 1.2 — 2016-02-04

This app has been updated by Apple to display the Apple Watch app icon.

Improvement of UI 
- Show tutorial.
- Clearer caption.
- Input animation. (Settings->Visual Effect->Input Animation)

Spraying
- Change: Active Ingredient -> Spray Solution per Area
- New Units: "ml/m2", "L/m2"

### 1.1 — 2015-09-10

Premium (In-App Purchase)
- Input decimal. (Settings->Calculation->Decimal)
- Calculate 1 tan as 10 arr. (Settings->Calculation->1tan = 10a

Others
- Bug fixes.

### 1.0 — 2015-01-24

No release notes.

## Apps similar to Dilution Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Fertilizer Calc App](https://appshunter.io/ios/app/fertilizer-calc-app/id1450299266) | 1.0 (1) | Free | Utilities |
| [Solution Dilution Calculator](https://appshunter.io/ios/app/solution-dilution-calculator/id1353265965) | 5.0 (1) | $2.99 | Utilities |
| [Ratio Calculator Total Tool](https://appshunter.io/ios/app/ratio-calculator-total-tool/id720675689) | 4.9 (7) | Free | Utilities |
| [割合計算機](https://appshunter.io/ios/app/id6477940610) | — | Free | Utilities |
| [Easy Dilution Ratio Calculator](https://appshunter.io/ios/app/easy-dilution-ratio-calculator/id6504449036) | — | Free | Utilities |
| [DRC - Detailing Calculator](https://appshunter.io/ios/app/drc-detailing-calculator/id1642812471) | 4.5 (11) | $1.99 | Utilities |

## More apps by Koji Iida

- [Math Cards - Addition & Subtraction](https://appshunter.io/ios/app/math-cards-addition-and-subtraction/id1138237758)
- [9x9 Cards](https://appshunter.io/ios/app/9x9-cards/id1254925679)

All apps by Koji Iida: https://appshunter.io/developer/955305523

## Related topics

[koji iida](https://appshunter.io/ios/topics/koji-iida)

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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 2026-06-11.*