The formula is not hidden
Each tool states the relationship it uses. The only way to trust a calculator is to see what it rests on.
Tools
The calculations we run by hand when planning a planted aquarium, gathered in one place. All free, no sign-up.
How do layout, water chemistry and care fit together?Build Your Own Aquarium
Substrate, rocks, plants and fish; CO₂, lighting, fertiliser, nitrogen cycling and maintenance scenarios.
Based on: One plan, shared volume, explicit formulas and repeatable scenarios.
How many litres is it, and how much load reaches the floor?Volume and Weight Calculator
Net water volume, filled weight and distributed floor load. Outer/inner dimensions, glass thickness, substrate and hardscape included.
Based on: Geometric volume; 100×40×40 inner dimensions give exactly 160 litres.- How much dissolved CO2 is actually in my water?
CO2 / pH / KH Calculator
Read dissolved CO2 from pH and carbonate hardness, and see the pH drop needed for a target CO2 level.
Based on: CO2 = 3 × KH × 10^(7−pH); matches published charts at seven points. 
How many grams a week, from which salt?Fertiliser Dosing Calculator
Macro and micro nutrient doses for EI, EI daily, low-light, PPS-Pro and PMDD schedules.
Based on: Stoichiometry: KNO3 61.33% nitrate / 38.67% potassium; KH2PO4 69.79% phosphate.
How much PAR reaches the substrate, and which band is that?Lighting Calculator
Required light intensity by depth and plant demand, across low, medium and high light bands.
Based on: Closed-form axial configuration factor of a rectangular light source.
Where does nitrate settle at this dose?Nutrient Accumulation Calculator
See where nitrate, phosphate and potassium settle given your weekly dose and water-change fraction.
Based on: Exact solution of the weekly cycle: steady = (D−U)(1−f)/f + T.
Why you can trust these numbers
A band, not a single number
Where measurement is genuinely uncertain we do not fake precision. The lighting tool shows a ±30% band; only a PAR meter gives the real figure.
Written from practice
We know which inputs actually matter from building and installing these tanks; the tools ask for those and nothing else.
These tools come out of Clan Aquascaping Design's own fabrication and design practice. If you are planning a custom-size aquarium, send us your results and we will take it from there.
Get a quote with your dimensions