# NPK Calculator

> Calculates fertilizer nutrient ratios for optimal plant growth. (iPhone/iPad app by Anton Simonov.)

- Source: https://appshunter.io/ios/app/npk-calculator/id988554060 (this page in markdown: same URL + `.md`)
- Developer: [Anton Simonov](https://appshunter.io/developer/988554059)
- Category: Productivity, Utilities
- Price: $2.99 (on sale, was $3.99)
- Rating: 3.30/5 from 8 App Store ratings · 12 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.5 · 3 MB
- Languages: American English, German (Germany), Hebrew, Hindi, Brazilian Portuguese, Russian, European Spanish, Ukrainian
- Released: 2015-05-23
- Data updated: 2026-09-02
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/npk-calculator/id988554060/reviews.md

## What is NPK Calculator?

Living beings such as plants require a proper balance, especially of nutrients, for optimal growth. Essential nutrients are necessary for basic functions, and trace nutrients for the best health. Nutrient lock-out can occur when the pH is out of balance or when there is too much of a nutrient. Even if overdosing doesn't occur, nutrients can be wasted by adding too much solution per fertilizing cycle.

NPK Calculator is an app for optimizing the ratio of macronutrients and micronutrients in your fertilizer solution for use in hydroponics or soil. Our in-app database contains many simple and complex fertilizers in the market. Several nutrition programs by knowledge growers with long-term experience are available in preset tabs. 

-Save money on fertilizer solution (up to 50%)
-Know the ratio of elements available in your solution
-Prevent fertilizer burns and nutrient lock-out
-Optimize nutrient uptake

## Key features

- Optimizes macronutrient and micronutrient ratios
- Database of fertilizers
- Nutrition programs from experienced growers
- Saves money on fertilizer solutions
- Prevents fertilizer burns and nutrient lock-out
- Optimizes nutrient uptake

## Recent user reviews (10 of 12)

All indexed reviews: https://appshunter.io/ios/app/npk-calculator/id988554060/reviews.md

### 5/5 — Very good

*2025-11-10*

Easy to use, good calculator

### 1/5 — Crap

*2022-05-18, version 1.0*

Crashes

### 1/5 — Nothing works

*2022-03-29*

This app is useless I want a refund

### 4/5 — Проблемы с подсчётом

*2020-02-28*

Не счтитает MgO, показывает 0 в общем, исправьте как и другие недочёты, о чём вам написали в других отзывах

### 1/5 — Not working. Save your money

*2019-06-24*

No help features. Keeps crashing. Won’t save custom entries- crashes and wipes data when I try. Contacted the developer twice but zero replies so it looks like maybe they’ve abandoned this app.

### 1/5 — Зря потратил деньги

*2018-09-03*

Если создать свой профиль и выбрать его - программа вылетает

### 1/5 — I want my money returned

*2018-02-15*

This app has zero functionality. It only allows users to use from a hand selected list of crap from crap nutrient companies. Also, their support contact info is bunk. Mail delivery subsystem kicked back the email I sent. @Apple, this developer is a fraud and should be dealt with.

### 1/5 — Kyct

*2017-03-31*

Совершенно не функционально. При добавлении систем питания вылетает...пользоваться невозможно

### 2/5 — Не функционально.

*2016-11-14*

Прямо скажем так себе калькулятор. Он не может подбирать объёмы удобрений исходя из чистого содержания веществ в растворе. Нет русского языка. Профили питания не сохраняются. Точнее они постоянно исчезают. Не обновляется. Одним соловом все очень сыро и недоработано!

### 5/5 — Amazing program

*2016-10-22*

This is to prevent nutrient lock out and burn, you can use it to get your plants very happy. It took me a second to figure it out but the website pretty much explains everything. It's great to have on hand and was well worth it for me. 👌

## Frequently asked questions about NPK Calculator

### What is the NPK Calculator app?

NPK Calculator is a paid application designed to help users optimize the nutrient ratios in their fertilizer solutions for plants. It provides a database of fertilizers and pre-set nutrition programs to improve plant health and growth.

### How much does the NPK Calculator app cost?

The NPK Calculator app is a paid application priced at $3.99. There are no in-app purchases or advertisements associated with its use.

### What devices support the NPK Calculator app?

The NPK Calculator app is supported on iPhone and iPad devices. It is designed for Apple's mobile operating systems.

### How often is the NPK Calculator app updated?

The latest version of the NPK Calculator app is 2.3, and it was last updated on December 26, 2025. This indicates regular maintenance and potential feature additions.

### What is the age rating for the NPK Calculator app?

The NPK Calculator app has an age rating of 4+. This suggests it is suitable for a wide range of users, including younger individuals with adult supervision.

### Can the NPK Calculator app help save money?

Yes, the NPK Calculator app aims to help users save money on fertilizer solutions by optimizing their use, potentially reducing waste by up to 50%.

### Does the NPK Calculator app have ads?

No, the NPK Calculator app does not contain advertisements. It is a paid application that offers an ad-free experience.

### What kind of information does the NPK Calculator app provide about fertilizer solutions?

The NPK Calculator app allows users to know the precise ratio of elements available in their fertilizer solution. It also helps prevent issues like fertilizer burns and nutrient lock-out.

## Version history (last 5 releases)

### 2.3 — 2025-12-26

Comma separated values input improvement.

### 2.2 — 2025-11-09

Minor UI improvements.

### 2.1 — 2025-11-07

Minor UI improvements

### 2.0 — 2025-10-29

New design with light and dark theme support. 
Persistent storage improvement.
German,Hebrew,Hindi,Portuguese,Russian,Spanish and Ukrainian language support.
Bulk calculator feature.

### 1.0 — 2015-05-23

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

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## Related topics

[npkalc](https://appshunter.io/ios/topics/npkalc) · [fertilizer calculator](https://appshunter.io/ios/topics/fertilizer-calculator)

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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 2026-09-02.*