Aquarium Fertilizer Calculator

GRAMSHIFT

Contains adsIn-app purchases

About this app

Stop guessing your fertilizer doses. Aquarium Fertilizer Calculator gives you the exact amount for YOUR tank — then helps you log, chart, and improve.

◆ CALCULATE
• 24 built-in commercial fertilizers (Seachem, Tropica, ADA, APT, NilocG, UNS, Dennerle, JBL and more) with manufacturer dosing
• Add your own fertilizer: enter the label dose (mL per L) and it works instantly
• DIY dry salts (EI method): KNO3, KH2PO4, K2SO4, CSM+B — weekly targets, per-dose amounts, stock-solution mode
• Presets: EI Standard, EI Low-tech, PPS-Pro
• CO2 estimator from pH & KH — auto-filled from your latest water log
• Teaspoon hints for dry salts

◆ LOG
• One-tap dosing, water change, and water test log (pH, GH, KH, NO3, PO4, temperature)
• Growth photo album with dates — watch your tank progress
• Dosing reminders so you never forget

◆ UNDERSTAND
• Trend charts with dose & water-change markers overlaid
• Tank check: when NO3 builds up or runs low, the app gently suggests adjusting — based on your real readings
• Export everything as CSV anytime. Your data stays yours.

◆ WORKS OFFLINE
No account. No sign-up. All data stays on your device.

Made for planted tank keepers, from low-tech beginners to EI veterans.

Product and brand names are trademarks of their respective owners. This app is an independent tool and is not affiliated with any manufacturer.

What’s new

Your purchase is now checked automatically when the app starts and when you return to it. You no longer need to tap "Restore purchase". If a purchase fails, we tell you right away.