Aquarium Fertilizer Calculator

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.