Measure round, square, oval, and tapered pots. See liters, cubic feet, and bag estimates instantly. Reduce guesswork before planting containers in patios and balconies.
V = πr²h
V = πh(D1² + D1D2 + D2²) / 12
V = L × W × H
V = h(A1 + A2 + 4√(A1A2)) / 6
Here, A1 = top length × top width and A2 = bottom length × bottom width.
V = (π / 4) × L × W × H
Adjusted Soil = (Base Volume − Drainage Volume) × Fill Level × Quantity × (1 + Wastage)
1,000 cm³ = 1 liter. 1 in³ = 0.016387064 liters. 1 ft³ = 28.316846592 liters.
| Shape | Dimensions | Qty | Fill % | Drainage | Waste % | Final Soil Required |
|---|---|---|---|---|---|---|
| Round Pot | 30 cm diameter × 28 cm height | 2 | 95 | 3 cm | 10 | 36.93 L |
| Tapered Round Pot | 38 cm top, 26 cm bottom, 35 cm height | 3 | 90 | 4 cm | 8 | 76.52 L |
| Rectangular Planter | 60 × 25 × 24 cm | 2 | 92 | 5 cm | 7 | 56.11 L |
| Oval Pot | 42 × 28 × 24 cm | 1 | 93 | 4 cm | 5 | 18.04 L |
Container projects look simple, but soil planning often gets ignored. A pot may seem small. Yet several containers can consume many liters quickly. This calculator helps you estimate soil volume before buying bags. It supports round, square, oval, and tapered pots. It also handles direct custom volume entries. That makes it useful for patios, balconies, nurseries, and small landscape jobs.
The form lets you choose a pot shape first. Then you enter dimensions in centimeters or inches. The calculator converts the shape into internal volume. After that, it adjusts for drainage layers, fill percentage, pot quantity, and waste allowance. This gives a more realistic buying estimate. It also shows liters, cubic feet, cubic meters, and US gallons. Bag estimates are included for common pack sizes. That saves time during ordering and transport planning.
Not every container should be filled to the rim. Many growers leave headspace for watering. Some pots include gravel or lightweight filler near the base. Others use tapered walls that change the true capacity. A simple length times width times height guess can overstate soil needs. This calculator reduces that problem. It uses shape based formulas and practical adjustments. The result is better stock control and less leftover material on site.
Pot soil estimation also supports planning around built spaces. Raised planters, entrance pots, rooftop containers, and hardscape accents all need accurate fill volumes. Better estimates improve procurement. They also reduce repeated store visits. Contractors can prepare quotations with clearer material lines. Home users can compare bag counts before starting. That keeps planting work cleaner, faster, and easier to budget.
The most important figure is adjusted soil required. That value accounts for the empty drainage zone, the selected fill level, the number of pots, and added waste percentage. Use the bag estimate as a purchase guide, then round up to whole bags. Keeping a small reserve is smart for topping up after watering and settling. It also helps when mixing compost, bark, perlite, or sand because you can estimate the base soil volume first, then divide that volume by desired ratio.
Yes. It works for both. You only need the correct shape and dimensions. Outdoor users may also add a wastage percentage for uneven filling and handling losses.
Many pots are not filled completely. Growers leave headspace for watering, mulch, or plant crowns. Fill level helps the estimate match real planting practice.
The drainage layer removes space from the soil estimate. Use it when gravel, stones, filler, or other base material occupies the bottom part of the pot.
Liters are usually easiest for bag shopping because many potting mixes are sold that way. Cubic feet also helps when larger bulk products are listed that way.
Soil settles. Some material spills during filling. A small wastage value helps avoid underbuying, especially when working with multiple containers in one project.
Yes for standard planter shapes with straight tapering sides. It estimates volume more realistically than a simple box formula when the top and bottom sizes differ.
Enter a known container capacity in liters, cubic feet, cubic meters, or gallons. In that mode, drainage depth is not applied because capacity is already given directly.
Yes. Always round up to whole bags for purchasing. A small extra amount is useful for topping up soil after watering and natural settling.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.