# HydroponicsCalc — Precise nutrient-Healthy plant > Hydroponic gardening management and calculation tool. (iPhone/iPad app by Douglas Stieber.) - Source: https://appshunter.io/ios/app/hydroponicscalc/id6775172331 (this page in markdown: same URL + `.md`) - Developer: [Douglas Stieber](https://appshunter.io/developer/6771586128) - Category: Utilities, Food & Drink - Price: $1.99 - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 26.5 · 1 MB - Languages: American English - Released: 2026-06-03 - Data updated: 2026-08-07 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/hydroponicscalc/id6775172331/reviews.md ## What is HydroponicsCalc? HydroponicsCalc is the complete grow-management companion for hydroponic gardeners — from beginners mixing their first concentrate bottles to experienced growers running multiple systems. RESERVOIR MANAGEMENT — FRONT AND CENTRE Your grow systems live on the home screen where you need them. See EC, pH, temperature, volume, and grow stage at a glance. Tap Log to record a reading or journal entry without digging through menus. Get change-due warnings before problems develop. CONCENTRATE MIXER Two modes for every workflow: • Bottle → EC: Enter bottle size and coverage target — get exact gram weights per component, dose rate (mL per gallon), and a live EC estimate. • Target EC → Dose: Enter your desired EC — get the mL-per-gallon dose you need. Supports MasterBlend 4-18-38, Jack's 321, General Hydroponics Flora Series, and more. Save your favourite configurations as reusable recipes. EC CALCULATOR Dial in nutrient strength with confidence. Input dose → see estimated EC. Input target EC → get required dose. An EC reference strip shows typical ranges from seedling to aggressive feeding, accounting for your source water baseline. pH CALCULATOR Enter current pH, target pH, and reservoir volume — get the exact mL of adjuster needed. Supports White Vinegar, Phosphoric Acid (pH Down), Potassium Hydroxide (pH Up), and custom adjusters with calibration mode. VPD CALCULATOR Vapour pressure deficit tracking with colour-coded zone feedback. Input air temperature, relative humidity, and leaf temperature offset — instantly see whether you're in the Too Humid, Seedling, Vegetative, Flowering, or Too Dry zone. GROW JOURNAL WITH PHOTO TIMELINE Document your grows with a date-sorted photo diary. Log observations, deficiencies, feedings, milestones, and harvests — with camera or photo library support. Export a full PDF archive of any journal. HARVEST LOG & ROI DASHBOARD Record wet weight, dry weight, and crop name for every harvest. Track cost-per-gram from your nutrient spend. See yield trends over time. Calculate energy costs from your light wattage and schedule. LIGHT SCHEDULE TRACKER Set your light schedule (18/6, 20/4, 12/12, or custom), log your flip date, and get an estimated harvest date with a countdown. US & METRIC Every calculator works in gallons/°F or litres/°C. One tap to switch — all values update instantly. NO SUBSCRIPTIONS. NO ADS. HydroponicsCalc is a one-time purchase. Everything is included. By HackerHomeLab.com ## Key features - Reservoir management dashboard - Concentrate and EC mixing calculators - pH and VPD calculators - Grow journal with photo timeline - Harvest log and ROI dashboard - Light schedule tracker - US & Metric unit support ## Chart rankings - #187 in Top Paid · Utilities (US App Store) ## Frequently asked questions about HydroponicsCalc ### What is HydroponicsCalc? HydroponicsCalc is a comprehensive grow-management companion for hydroponic gardeners. It helps users manage reservoirs, mix nutrients, calculate pH and VPD, and document their grows. ### How much does HydroponicsCalc cost? HydroponicsCalc is a one-time purchase priced at $1.99. There are no subscriptions or ads included with the app. ### Does HydroponicsCalc have ads? No, HydroponicsCalc is ad-free. The app is a one-time purchase and includes all features without advertisements. ### What devices does HydroponicsCalc support? HydroponicsCalc is available for iPhone and iPad devices. It is rated for ages 4 and up. ### Can HydroponicsCalc help me mix nutrients? Yes, HydroponicsCalc features a concentrate mixer with two modes: 'Bottle to EC' and 'Target EC to Dose'. It supports popular nutrient lines like MasterBlend and General Hydroponics Flora Series. ### Does HydroponicsCalc track my grow progress? Yes, HydroponicsCalc includes a grow journal with a photo timeline to document observations, deficiencies, feedings, and harvests. It also has a harvest log and ROI dashboard to track yield and costs. ### How often is HydroponicsCalc updated? HydroponicsCalc was last updated on June 3, 2026, with version 1.2. The release date was also June 3, 2026. ### What kind of environmental data can HydroponicsCalc track? HydroponicsCalc can track Vapour Pressure Deficit (VPD) with color-coded zone feedback based on air temperature, relative humidity, and leaf temperature offset. It also allows for reservoir temperature tracking. ## Version history (last 1 release) ### 1.2 — 2026-06-03 No release notes. ## More apps by Douglas Stieber - [Builders-Calc](https://appshunter.io/ios/app/builders-calc/id6774176747) All apps by Douglas Stieber: https://appshunter.io/developer/6771586128 ## Related topics [hydroponicscalc](https://appshunter.io/ios/topics/hydroponicscalc) --- *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 2026-08-07.*