[ FRESHWATER · FREE TOOLS · NO SIGN-UP REQUIRED ]
Free tools for planted tank keepers. Enter your numbers, get your answer — no accounts, no paywalls.
These calculators cover the measurements freshwater and planted tank keepers reach for most often — tank volume, fertilizer dosing, and water parameter planning. No accounts, no paywalls. Every tool runs entirely in your browser.
§ 01 · Calculators
Aquarium Volume Calculator
Calculate tank volume in liters and gallons from length, width and height. Supports centimetres and inches. Shows gross and usable volume.
Use Calculator → Plant NutritionFertilizer Dosing Calculator — EI Method
Calculate weekly EI method doses for KNO3, KH2PO4, K2SO4 and CSM+B from your tank volume. Covers high-tech and low-tech setups.
Use Calculator →[ Planted Tank Guides ]
From the Guide Library
Pillar Guide
The Complete Planted Tank Setup Guide
Full setup framework including fertilization strategy and plant selection.
Read guide →Review · Substrates
Best Substrate for Planted Tanks
Tested picks for root-feeding plants and aquasoil setups.
Read guide →Review · Lighting
Best Lights for Planted Tanks
PAR-verified picks for low, medium and high-tech planted tanks.
Read guide →Water Quality
Aquarium Algae Types — Identification Guide
Nutrient imbalances are the primary driver of most algae types.
Read guide →