Reef Calculators

$Refractometer with Calibration Solution$
Salinity Calculator
Calculate the perfect salinity levels for your saltwater aquarium. Our Salinity Calculator helps you maintain optimal water conditions for your marine life, ensuring healthy and thriving fish and corals.
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Water Change Calculator
Determine the ideal water change schedule and volume for your tank. Our Water Change Calculator takes the guesswork out of maintenance, helping you keep your aquarium parameters in perfect balance.
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Tank Volume Calculator
Quickly calculate your tank's total volume in gallons or liters. Knowing your exact tank volume is essential for dosing, stocking decisions, and maintaining proper water chemistry.
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Dosing Calculator
Accurately calculate supplement and medication dosages for your reef tank. Our Dosing Calculator ensures you're adding the right amount of elements, trace elements, and treatments to maintain optimal water chemistry and support coral growth.
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PAR Recommendations
Understand the ideal PAR (Photosynthetically Active Radiation) levels for different corals and aquatic plants. Our PAR Recommendations guide helps you position lighting correctly and select the right fixtures for your specific system.
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Heater Calculator
Find the right heater wattage for your reef tank based on tank volume, ambient room temperature, and your target water temperature. Our Heater Calculator takes the guesswork out of keeping your tank at the perfect temperature for fish and coral health.
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Everything you need to keep a thriving reef tank

Ideal Parameters for Reef Aquarium

Calcium (Ca)
Aquarium: 380 - 450 ppm | Ocean: 420 ppm

Alkalinity (KH)
Aquarium: 8 - 12 dKH / 2.86 - 4.29 meq/L | Ocean: 7 dKH / 2.5 meq/L

Magnesium (Mg)
Aquarium: 1200 - 1400 ppm | Ocean: 1280 ppm

Phosphate (PO₄)
Aquarium: 0.01 – 0.03 ppm (Preferred) / 0.01 – 0.1 ppm (Tolerable) | Ocean: 0.005 ppm

Nitrate (NO₃)
Aquarium: 1 – 10 ppm (Preferred) / 1 – 20 ppm (Tolerable) | Ocean: Less than 0.1 ppm (typical but varies)

Nitrite (NO₂)
Aquarium: 0.0 ppm typically | Ocean: Less than 0.0001 ppm (typical but varies)

Ammonia (NH₃)
Aquarium: 0 ppm | Ocean: Less than 0.1 ppm (typical but varies)

Salinity
Aquarium: 1.023 - 1.026 SG / 32 - 35 ppt | Ocean: 1.025 - 1.027 SG / 34 - 36 ppt

Temperature
Aquarium: 76° - 80°F (Must be kept stable) | Ocean: Variable

pH
Aquarium: 8.1 - 8.3 (Preferred) / 7.8 - 8.4 (Tolerable) | Ocean: 8.1 - 8.3 (Varies in lagoons)

ORP
Aquarium: 250 - 400 mV | Ocean: Variable

Iodine (I)
Aquarium: 0.06 ppm | Ocean: 0.06 ppm (Varies in lagoons)

Strontium (Sr)
Aquarium: 7 - 9 ppm | Ocean: 8 ppm

Iron (Fe)
Aquarium: Below Kit Detection | Ocean: 0.000006 ppm

Boron (B)
Aquarium: Less than 10 ppm | Ocean: 4.4 ppm

Silica (Si)
Aquarium: Less than 1 ppm (Lower if diatoms are a problem) | Ocean: Less than 0.06 - 2.7 ppm