Compares three package formats
See separate estimates for large XXL pots, 7 cm in-vitro cups, and large in-vitro cups.
Tools
Aquarium plant calculator
Estimate how many potted or in-vitro aquarium plants you need to create a well-planted layout from the tank footprint.
Plan plant quantity before ordering.
Measure the inside planting footprint at substrate level.
Uses the planting footprint
Enter aquarium length and width in centimeters or inches to estimate the available bottom area.
Useful before ordering
Use the result to compare formats, then adjust for hardscape, open sand, desired density, and each species' growth habit.
Planted aquarium planning guide
Plan enough plant mass for a convincing planted aquarium.
A plant quantity estimate turns the tank footprint into a practical starting order. It helps compare package formats, budget a new aquascape, and avoid starting with so little plant mass that the layout takes months to fill in.
How the aquarium plant calculator works
The calculator multiplies aquarium length by width to find the bottom footprint. It then divides that area by a planning allowance for each plant package format and rounds up to a whole package so the estimate does not leave part of the footprint uncovered.
The package rows are alternatives, not quantities to add together. A 7 cm in-vitro cup can be split into more small portions than a mature potted plant, so each format uses a different coverage allowance.
Adjust for the area you will actually plant
The estimate begins with the full rectangular footprint. Large stones, driftwood, paths, open sand, and equipment reduce the area that can hold plants.
If roughly one quarter of the bottom remains open, reduce the result by roughly one quarter. Irregular layouts do not need perfect measurement; a sensible planted-area estimate is enough for buying decisions.
Dense starts and patient starts need different quantities
A dense day-one layout usually needs the calculated amount rounded up, sometimes with a small buffer. More initial plant mass can make the layout look established sooner and gives plants more opportunity to use available light and nutrients.
A patient, lower-budget setup can start with fewer packages and allow runners or stems to fill the space. This takes longer and depends more heavily on stable light, CO2, nutrition, and maintenance.
Species size still matters
One large Echinodorus can occupy far more space than one small carpeting portion. Stem plants, rosettes, epiphytes, and carpeting species also divide and spread differently.
Treat the result as a mixed-layout planning guide. After choosing species, check mature size and planting recommendations before placing the final order.
FAQ
Aquarium Plant Calculator FAQ
How many plants do I need for my aquarium?
It depends on the planting footprint, package format, hardscape area, species size, and how dense you want the aquarium on day one. Enter the tank length and width for a practical starting estimate.
Should I add all three result quantities together?
No. Each row is an alternative estimate for one package format. Choose the format you plan to buy, or use the figures as a guide when mixing formats.
Do rocks and driftwood change the result?
Yes. Large hardscape and open sand reduce the plantable area, so reduce the estimate in roughly the same proportion.
Are in-vitro cups equivalent to potted plants?
Not exactly. In-vitro cups contain many small sterile plantlets, while pots often contain larger established plants. The number of usable portions varies by species and producer.
Should I round the estimate up or down?
Round up for a dense initial layout or difficult-to-fill gaps. Use fewer packages if you are comfortable waiting for healthy plants to spread and fill the aquarium.
Does aquarium height affect plant quantity?
Height affects lighting and species choice, but this quantity estimate is based on the bottom planting area, so it uses length and width only.
Related aquarium planning
Continue with the next aquarium decision.
Use the calculator result with logs, guides, and maintenance tools so one number becomes part of a repeatable aquarium care routine.
Other tools
Try our other free tools!
Plant growth
CO2 calculator
Estimate CO2 concentration from KH and pH readings for planted tank troubleshooting.
- KH and pH
- CO2 ppm
- Plant health checks
Water chemistry
Nitrogen cycle helper
Interpret ammonia, nitrite, and nitrate with fish-in safety context and confirmation steps.
- Cycle phase
- Fish-in warnings
- Repeated checks
Maintenance
Aquarium dosing calculator
Scale a product-label dose and convert mL, pumps, spoons, and density-aware grams.
- Label scaling
- Custom pumps
- Unit conversion
Equipment
Filter flow & turnover calculator
Compare delivered flow with filter or display-circulation planning ranges.
- Measured flow
- Rated-flow estimate
- Turnover
Measurement
Aquarium unit converter
Convert aquarium volume, temperature, length, flow, GH, and alkalinity.
- US and UK gallons
- Flow and temperature
- GH and KH
Saltwater chemistry
Salinity converter
Convert specific gravity and practical salinity with temperature context.
- SG
- Practical salinity
- EOS-80
Saltwater preparation
Salt mix calculator
Scale product directions for a new batch or plan separately mixed correction water.
- Product ratio
- Replacement batch
- Mixing safety
Budgeting
Aquarium running cost calculator
Estimate electricity, replacement water, and recurring aquarium expenses.
- kWh
- Heater duty cycle
- Monthly budget
Get the app
Take Aquarium Tracker with you.
Download on iOS or Android to log water tests, plan maintenance, and get reminders on the go.
Free to useBuilt for aquarium keepersSync across devices