Stocking and Compatibility Calculator
Building a balanced aquarium requires more than simple rules.
This calculator was created to give you real‑time recommendations from hands‑on experience — without the frustration of clunky interfaces or outdated “inch‑per‑gallon” logic.
Species database: 1000+ species and growing
Share it with one click.
Flow Rate Converter & Turnover Calculator
Flow Rate Converter & Turnover CalculatorConvert between LPH, GPH (US/UK), LPM, m³/h – enter any value, get all others instantly.
Add tank volume (gallons/liters) to see your filter turnover rate. The tool shows whether your flow is ideal for freshwater community, cichlids, planted tanks, or reef aquariums.
Two‑way sync, color‑coded recommendations, one‑click share.
CO2 Level Calculator
Enter pH, KH, and temperature — get an instant CO2 reading.
Choose from multiple calculation methods (simple, temperature‑compensated, Millero) to match your setup. The color‑coded chart shows safe zones for low‑tech planted, high‑tech planted, community fish, or shrimp tanks.
Aquarium Volume & Weight Calculator
It gives you the real water volume, total tank weight, and glass thickness recommendation – not just the “store size”.
It automatically subtracts glass thickness for internal volume, supports 6 shapes (rectangular, cylinder, corner, bow‑front, hexagon, octagon), and calculates total weight including water, material, substrate, and decor.
Switch instantly between US and Metric units, and share your exact setup with one click.
Aquarium Lighting Calculator (PAR & DLI)
Real‑time PAR and DLI at surface, mid‑water, substrate.
Enter tank size, lumens, reflector, spectrum — get Low/Medium/High status. Inches/cm, clear/blackwater, measured lux mode, one‑click share. No more watts‑per‑gallon.
One‑click share, tooltips for every input, and instant color‑coded status.
Aquarium Ca:Mg Balance Calculator
Enter total hardness (dGH) and calcium (ppm) – instantly get your magnesium level and Ca:Mg ratio. See if your balance is right for shrimp (Neocaridina / Caridina), plants, or reef tanks.
Get dosing recommendations for liquid or powder supplements. Switch between litres/gallons, ppm/mg/L. One‑click share.
Units Converter
Now you can convert weight, length, volume, temperature, hardness, concentration, salinity and pressure – all in one place. Just type a number, and the rest update right away. Use it when you’re setting up a tank, measuring ferts, or comparing gear. If you keep fish, this little tool will save you time and clicks.