HydroponicsCalc
Precise nutrient-Healthy plant
$1.99 · Designed for iPad. Not verified for macOS.
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
Ratings & Reviews
Your reservoirs now save reliably, and number fields have a Done button.
New: Dose Calculator, week-by-week Feed Schedule, pH & EC trend charts, Build Formula and A+B stock solutions, nutrient cost comparison, shareable PDF grow reports, Home Assistant sensor import, optional iCloud sync and CSV export.
The developer, Douglas Stieber, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Douglas Stieber
- Size
- 2.8 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 - Hackerhomelab
