The Easy Way to Dose & Track Your Reef Tank
Try It Now — No Account Needed
Enter your tank volume, current levels, and desired levels. We will calculate the exact dose using real commercial products.
⚠ Do not exceed 10 ml per 20 gallons per day
Supports Brightwell, Seachem, Red Sea, ESV, Tropic Marin, and more.
Everything Your Reef Tank Needs
Precision Dosing Calculator
Calculate exact doses for Calcium, Alkalinity (dKH, meq/L, ppm), and Magnesium using coefficients from real commercial products like Brightwell, Seachem, and Red Sea.
Track Parameters Over Time
Log salinity, calcium, alkalinity, magnesium, pH, nitrate, phosphate, and temperature. View trend charts with ideal range shading to keep your reef thriving.
Smart Safety Warnings
Built-in pH impact alerts and manufacturer dosing warnings help you avoid overdosing. Know exactly what to expect before you add anything to your tank.
How It Works
Enter Your Tank Volume
Tell us how many gallons (or liters) your reef tank holds.
Set Current & Target Levels
Input your current Calcium, Alkalinity, and Magnesium readings and where you want them to be.
Get the Exact Dose
Pick your product and instantly see the precise amount to dose, with unit conversions and safety warnings.
Stop Guessing. Start Dosing with Confidence.
Create a free account to save your calculations, log parameters over time, and keep your reef tank in perfect balance.
Get in Touch
Have questions about dosing, tracking, or anything reef-related? We are here to help.