This free aquarium plant quantity calculator tells you how many plant pots your tank needs in each zone, from its base area and planting density. It runs fully in your browser, so nothing you type is sent to a server, and you need no account and no sign-up to use it.
Aquarium problems usually build slowly. A tank that looks fine today can drift over weeks when feeding, stocking, or water changes stay unmeasured. Small numbers, checked early, stop most trouble before fish show stress. This tool turns a guess into a number you can act on, and that number is easier to trust than a rough rule of thumb from a shop assistant.
To use the tool, type in Tank base area (square cm), Planting density. Press the calculate button and the tool shows the result at once. If you change any number, press calculate again to see the new result right away. Try a few values to see how sensitive the result is to each input.
Example: a tank base of 1200 square cm with medium planting needs about 24 pots in total: 10 foreground, 8 midground, and 6 background pots.
Plant heavily from day one. Dense planting outcompetes algae for nutrients and gives fish shelter at once, while a sparse tank invites algae and stress.
Put tall plants at the back and short ones at the front. Reversed planting hides fish behind a wall of leaves and makes the tank look smaller than it is.
Trim regularly and replant cuttings. Most stem plants root from cuttings, so one pot can fill a whole background over a few months at no extra cost.
Common question: How do I measure base area? Multiply tank length by width in centimetres. A 100 cm by 40 cm tank has a base of 4000 square cm, not the water volume printed on the box.
Common question: Do plants need special substrate? Root feeders like swords do best in nutrient substrate, while epiphytes like java fern grow tied to wood or rock. Match the plant to the planting method.
Common question: Why do new plants melt? Many shop plants grow leaves above water, and those leaves die back underwater before new submerged leaves grow. Melt is normal if roots stay firm and new growth appears.
Keep a short notebook by the tank. Write the date, the numbers you entered, the result, and anything you changed afterwards. That short record turns a vague feeling that something changed into clear evidence. After a month you can look back and see which choices helped and which ones did not, and that makes the next decision much easier.
The most common mistake is changing too much at once. When several things change in the same week, you cannot tell which change caused the result you see. Change one thing, wait, watch the fish and the water, and only then change the next thing. Slow, single changes keep a tank stable, and stable tanks keep fish healthy.
Recheck the numbers whenever anything changes in the tank. New fish, a new filter, a different food, or a change in room temperature can all shift the right answer. A quick recheck takes less than a minute and stops an old number from quietly becoming wrong. Bookmark this page so the recheck is easy.
This tool is free to use as often as you like. Bookmark it, recheck the numbers when your tank changes, and keep the daily routine steady. Small, steady habits matter far more for an aquarium than any single perfect number, and a calm routine is what fish respond to best. If a number surprises you, run the tool twice with different inputs before you act on it, and trust the steadier result.
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