The potting soil calculator takes diameter across top, diameter across bottom, depth, diameter, length, quantity and width and returns volume of soil needed. It is built for quick answers, for checking somebody else’s arithmetic, and for the moments when a formula book is not within reach.
What Is the Potting Soil Calculator?
The potting soil calculator works out volume of soil needed from diameter across top, diameter across bottom, depth, diameter, length, quantity and width.
Biological relationships are usually approximations rather than exact laws, so the output is best treated as an estimate with a sensible range around it.
How the Potting Soil Calculation Works
The calculation applies the relationship as published, step by step, so each intermediate value can be checked against the underlying theory.
Keep the units consistent throughout. Mixing a percentage with a proportion is the single most common source of an answer that is out by a factor of a hundred.
Assumptions Worth Knowing
Any relationship used here assumes a constant rate, a representative sample, or a stable population. Real populations rarely meet those conditions for long, so treat the answer as a guide.
Where the inputs are field measurements, a single misread value can shift the result noticeably. Measure carefully and record what you used.
A Worked Example
Working through an example, with diameter across top set to 10, diameter across bottom set to 5, depth set to 2, the calculator returns volume of soil needed of 200, and volume of soil needed (soil round) of 78,539.816, and volume of soil needed (soil pot) of 458.149. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out volume of soil needed?
Enter diameter across top, diameter across bottom, depth, diameter, length, quantity and width. The calculator then works through the relationship and reports volume of soil needed.
What does the potting soil actually calculate?
It takes diameter across top, diameter across bottom, depth, diameter, length, quantity and width and converts them into volume of soil needed using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter diameter across top?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Do I have to fill in every field?
Only the fields a particular result depends on. If you leave one blank, the results that need it simply show a note instead of a number, and everything else still works.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.