Aquarium Calculators

Eliminate guesswork with our aquarium calculators! Estimate your electric bill, see how much sand, supplements, medicine or media you’ll need and more!

Calcium Supplement Calculator

Calcium is an essential building block for corals, clams, and coralline algae. Using our calcium calculator you can enter your current calcium level, desired level, and the brand of calcium supplement you use to determine how much you should dose to get your water parameters in line.

Magnesium Supplement Calculator

Maintaining proper magnesium levels in your reef aquarium will help corals grow and thrive! Using our magnesium calculator you can enter your current magnesium level, desired level, and the brand of magnesium supplement you use to determine how much you should dose to achieve ideal parameters.

Alkalinity Supplement Calculator

Maintaining proper alkalinity levels in your reef aquarium will help corals grow and thrive! Using our alk calculator you can enter your current alkalinity level, desired level, and the brand of alkalinity supplement you use to determine how much you should dose to achieve ideal parameters.

Carbon Media Calculator

Our carbon calculator will tell you approximately how much carbon to use inside your aquarium. Just enter the number of gallons of your tank and click calculate. Carbon works best when used inside a media reactor, but can also be placed inside a filter media bag.

GFO Media Calculator

Our GFO calculator will tell you approximately how much granular ferric oxide to use inside your aquarium. Just enter the number of gallons of your tank and click calculate. GFO works best when used inside a media reactor but can also be placed inside a filter media bag.

Water Volume Calculator

Knowing your aquarium water volume is extremely useful. You can use it to determine how much water needs to circulate, which filtration equipment to buy, how much water to change, how much medicine or supplement to dose and even how much livestock can safely inhabit your tank.

Sand Bed Calculator

Whether you're planning a shallow sand bed for a fish-only tank or a deep sand bed for your mixed reef, our CaribSea-powered sand bed calculator helps ensure you buy the right amount of sand for your system. Just enter your aquarium's length, width and ideal sand bed depth to calculate how many pounds of sand you'll need.

Salt Mix Calculator

No matter how you feel about mixing saltwater, producing consistent batches of saltwater is important. Pure water has density or specific gravity of 1.0. As salt is added the liquid becomes denser and the specific gravity increases. The specific gravity of saltwater should fall in the range of 1.023-1025.

Electric Bill Calculator

Our aquarium electrical calculator will give you a pretty good idea of how much you'll fork over for your monthly and yearly electricity bills. Just plug in the wattage of your equipment—lights, pumps, protein skimmers, reactors, etc. —and how many hours per day you intend to run each of them and voilà!

Unit Calculator

Aquarium supply manufacturers list product specs in a variety of different units. Use our handy measurement unit converter to change Celsius into Fahrenheit, centimeters into inches, ounces into pounds and liters into gallons. Temperature, length, weight and volume conversions are all available.

VorTech Pump Flow Calculator

VorTech pumps are widely considered the gold standard for flow in a reef tank. EcoTech Marine, creators of the VorTech, designed this flow calculator to help hobbyists determine which size (MP10, M40, or MP60) and how many VorTech pumps they will need to provide adqeute flow for SPS and LPS corals.