There is no point reaching for a calculator that cannot show its working. This one starts from a axis, b axis, base, height, length, radius, coverage rate and width and reports seeds and area, so you can see how each answer follows from the numbers you entered.
What Is the Grass Seed Calculator?
The grass seed calculator works out seeds and area from a axis, b axis, base, height, length, radius, coverage rate 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 Grass Seed 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 a axis set to 10, b axis set to 5, base set to 2, the calculator returns area of 1,000, and area (area circle) of 78.53982, and area (area elipsis) of 157.07963. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out seeds?
Enter a axis, b axis, base, height, length, radius, coverage rate and width. The calculator then works through the relationship and reports seeds and area.
What does the grass seed actually calculate?
It takes a axis, b axis, base, height, length, radius, coverage rate and width and converts them into seeds and area 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 a axis?
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.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.
Can I use this for a quick estimate as well as a precise answer?
Yes. The calculator is built for quick checks, so round your inputs to a sensible number of significant figures and the result will be just as useful. If you need more precision, keep the same method and add digits to the inputs rather than adjusting the method itself.