BuzzDaddy21 Posted January 4, 2022 Share Posted January 4, 2022 Hi all. Anybody know the formula to calculate water volume in an aquarium?? I`m curious to check on a given tank size.😕 Link to comment Share on other sites More sharing options...
HH Morant Posted January 4, 2022 Share Posted January 4, 2022 In inches : Length x width x height = cubic inches Then convert cubic inches to gallons. About 231 cubic inches to the gallon. If you want to be super-accurate, you can use inside dimensions rather than outside dimensions. 1 1 Link to comment Share on other sites More sharing options...
lefty o Posted January 4, 2022 Share Posted January 4, 2022 if you want to skip the math, you can generally google a given tank size say 20x12x24 inches = how many gallons. 2 Link to comment Share on other sites More sharing options...
HotTunaCartel Posted January 4, 2022 Share Posted January 4, 2022 On 1/4/2022 at 11:13 AM, BuzzDaddy21 said: Hi all. Anybody know the formula to calculate water volume in an aquarium?? I`m curious to check on a given tank size.😕 I used this site when building my 44g longboy https://www.calculatorsoup.com/calculators/construction/tank.php 1 Link to comment Share on other sites More sharing options...
Gator Posted January 4, 2022 Share Posted January 4, 2022 (edited) @BuzzDaddy21; One gallon of water is 231 cubic inches. Before you add the first drop of water, take the inside measurements, multiply L x W x H and divide by 231, this will give you the exact number of gallons. By height, I measure from the bottom to the bottom of the lip my glass hood is going to sit on. @HH Morant; Sorry, I entered this before I read other posts. Edited January 4, 2022 by Gator 1 Link to comment Share on other sites More sharing options...
BuzzDaddy21 Posted January 5, 2022 Author Share Posted January 5, 2022 On 1/4/2022 at 6:54 PM, Gator said: ; One gallon of water is 231 cubic inches. Before you add the first drop of water, take the inside measurements Never thought about the inside, but that would only be a small reduction.🤨 Link to comment Share on other sites More sharing options...
Flumpweesel Posted January 5, 2022 Share Posted January 5, 2022 Measure from the top of the substrate with the current move towards deeper substrates for planting this can be quite important to check especially for calculating volume for meds.  Equally measure only to where you will keep the waterline. I knock about 30litres off my aquariums max volume to account for the decoration. Link to comment Share on other sites More sharing options...
isaly Posted January 5, 2022 Share Posted January 5, 2022 I have well over one five gallon bucket of varigated natural gravel as a substrate...and some coastal Maine granite rocks. 55 is effectively 47 ish. Link to comment Share on other sites More sharing options...
MickS77 Posted January 5, 2022 Share Posted January 5, 2022 If you fill your tank with a Python style hose you can attach a flow meter to it to see how many gallons actually go into the tank after you've added substrate, hardscape, decor, etc. 2 1 Link to comment Share on other sites More sharing options...
BuzzDaddy21 Posted January 5, 2022 Author Share Posted January 5, 2022 On 1/5/2022 at 10:30 AM, Flumpweesel said: I knock about 30litres off my aquariums max volume to account for the decoration. Big tank?? I would think rocks and wood would displace the most water, I never thought about how much. I can`t keep guppy grass alive but I would guess it would take lots of plants to match rocks or wood in volume?? The water flow meter would be interesting.  Link to comment Share on other sites More sharing options...
Flumpweesel Posted January 5, 2022 Share Posted January 5, 2022 On 1/5/2022 at 8:55 PM, BuzzDaddy21 said: Big tank?? Fairly big 230litres which is about 60 US gallons I think. I use quite a thin substrate layer one large log and some smaller hollow caves and structures. I don't really worry about the plants. If you are using stone you can get their volume by measuring the displacement of you want to be super actuate (or work it out for smaller one and estimate). I think it's important to have a good idea of the real water volume in particular for treating with meds and salt but for fish I think common sense about how much space they need is generally adequate and if we overstock we just have to get the buckets out more often. 1 Link to comment Share on other sites More sharing options...
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