249+ iOS apps curated and reviewed
Finding the right npkalc apps can be overwhelming with so many options. We've analyzed 249+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 4.1★ (7) | No | Yes | Aug 2026 |
| 2 |  | Free | — | Yes | No | May 2026 |
| 3 |  | Free | 3.3★ (26) | No | No | Aug 2026 |
| 4 |  | Free | 5.0★ (2) | No | No | Jul 2026 |
| 5 |  | Free | 5.0★ (1) | No | Yes | Aug 2026 |
| 6 |  | Free | — | No | No | May 2026 |
| 7 |  | $3.99 | 3.3★ (8) | No | No | Aug 2026 |
| 8 |  | Free | 5.0★ (3) | No | No | May 2026 |
This app helps calculate fertilizer needs for various applications, supporting both granular and liquid types with flexible unit inputs. It's designed for anyone managing lawns, gardens, or larger agricultural areas.
Plan your farm's fertilizer applications with this reference tool. Select your crop and desired yield to determine the necessary vital nutrients. Save and email results for future planning.
This app simplifies complex calculations for natural farming inputs like BRV, FPJ, and OHN. It provides instant, accurate dilutions for various KNF and JADAM formulas, eliminating guesswork and errors in field applications. Designed for ease of use, it allows users to focus more on their plants and less on manual math.
This app is a comprehensive lawn care toolkit that uses precision math and live climate data to help users grow healthier lawns. It offers tools for calculating fertilizer rates, logging applications, diagnosing issues with AI, and tracking weather patterns. Manage multiple lawn zones and access global pest pressure data.
This app helps optimize fertilizer solutions for plants by calculating the correct ratios of macronutrients and micronutrients. It aims to save money, prevent nutrient imbalances, and improve nutrient uptake for healthier plant growth in hydroponics or soil.
This app provides farmers with essential tools and data for optimizing crop production and maximizing investments. It offers features for weather forecasting, nutrient management, tractor calculations, and access to agronomic research and news.
This app helps homeowners and turfgrass professionals calculate fertilizer needs for lawns. It provides tools for spreader calibration, label interpretation, and application guidance through animations and videos.
Easily estimate landscaping materials like gravel, soil, mulch, and concrete. Supports multiple units of measurement for accurate project planning. Ideal for DIYers and professionals.
This utility calculates the optimal nitrogen fertilizer rate for crops based on agronomic research and current economic conditions. It provides a customized recommendation to maximize returns.
This app helps farmers precisely calculate fertilization needs for their crops. Users can input field details, set fertilization targets for key nutrients like N, P, and K, and determine the required application rates per hectare. It also supports custom area units for flexible calculations.
Easily estimate the volume of soil, topsoil, dirt, and landscaping materials needed for any project. Supports various area shapes and multiple measurement units, providing results in multiple volume and weight formats, including the number of bags.
This app helps users create custom plant nutrient feed charts for their gardening needs. It allows for detailed calculations based on growth stages and reservoir types, providing precise nutrient amounts. Technical support is also available.
Easily calculate the exact amount of materials needed for any project, from landscaping to construction. This app provides accurate measurements for soil, gravel, concrete, and mulch, saving you time and money.
This app offers both basic and scientific calculation modes with over 30 scientific operations. It allows for customization of the app's appearance and includes features for note-taking, drawing, and viewing calculation history. It supports high accuracy calculations and nested parentheses.
This app simplifies chemical mixing for agricultural applications. It calculates precise product rates, total gallons, and load breakdowns based on user inputs like acreage and tank size. Users can save custom mixes, manage multiple sprayers, and share detailed breakdowns with their teams.
This utility app offers a clean and intuitive interface for performing calculations. It prioritizes a user-friendly design with large buttons and a clear display for quick and efficient use.