Calculators
We have the largest most advanced selection of aquarium calculators you'll find anywhere on the Internet.These programs allow you to calculate almost anything, from the number of fish you can keep in your tank, to the precise number of water changes you should be making.
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Convertors A massive range of unit conversion calculators for converting pretty much any aquatic units you can think of. More » |
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Electricity cost calculator How much electricity does your tank use and how much does it cost? Now shows potential savings possible by switching energy supplier. More » |
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Pond liner calculator Use this calculator to work out how much pond liner and underlay you need, and how much it is likely to cost you. More » |
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Calcium cost calculator How much does your calcium supplement really cost you and would a reactor be a better option? More » |
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Aquarium volume calculator Work out how much water is in your aquarium using our extremely popular aquarium volume calculator. More » |
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Stocking density calculator Work out the approximate number of fish you can keep in your aquarium using our suggested stocking guidelines. More » |
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Carbon dioxide calculator This gadget for planted tank experts can estimate CO2 levels based on KH and pH test results. More » |
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Water change calculator Are you changing enough water? This unique program can tell you how much to change and how often. It's the key to perfect water. More » |
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Nitrite detoxification calculator Calculate how much salt you need to add to reduce the toxicity of any nitrite present in your water. More » |
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Temperature change calculator Doing a large water change and topping up with unheated water? How much boiling water do you need to add to keep the temperature stable? More » |
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Ammonia toxicity calculator Work out the proportion of toxic ammonia to ammonium in your water based on the pH and temperature. More » |
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Pearson's square calculator Get water of any hardness by mixing harder tapwater with your RO in the right quantity using this clever gadget. More » |
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Treatment dose calculator Enter the treatment details and the size of your tank and we'll work out how much to add, and tell you how much it will cost. More » |
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rH calculator Work out the rH of your reef tank based on the ORP, pH and dissolved oxygen levels. More » |
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Calcification calculator Estimate the calcification rate of your corals and other inverts using this handy chemistry gadget. More » |
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Carrying capacity calculator Working out the number of fish an aquarium can support is immensely complicated. This program performs some complex calculations to work this out for UG filters. More » |
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Periodic table Expert fishkeepers often need to refer to the Periodic Table of Elements. Here's our nifty computerised version. More » |
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Salt mix calculator Doing a water change on your marine tank? Use this salt mix calculator to work out how much salt to add. More » |
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Substrate calculator Work out roughly how much substrate you need for your aquarium. More » |
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Pond volume calculator Work out roughly how much water your pond contains, and how many fish you can keep in it. More » |
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Pump efficiency calculator Estimate the electrical efficiency of your pump or filter with our efficiency calculator. More » |
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Calcium dose calculator A gagdet for advanced reefkeepers which works out how much calcium you need to add to your aquarium using the raw ingredients. More » |
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Light intensity calculator Calculate light intensity on your reeftank and get recommendations on what lighting you need to add to get better coral growth. More » |
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Turnover calculator Work out how many times your water is circulated by your filters or water movement system with this turnover calculator. More » |
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Water weight calculator Calculates the approximate weight of the water in your aquarium depending on its salinity. More » |
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Carbon dioxide bubble calculator Work out how much carbon dioxide to add to your planted tank based on its volume and KH. More » |
