This circle skirt calculator takes the figures you already have and applies the relationship behind circle skirt calculations for you, giving fabric length and waist from skirt length, type and waist radius.
What Is the Circle Skirt Calculator?
The circle skirt calculator turns skirt length, type and waist radius into fabric length and waist.
It is a quick way to get from the numbers you have to the number you need, without setting up a spreadsheet or reaching for a formula.
How the Circle Skirt Works
Each result follows from the ones before it, and the calculator shows every step, so a surprising answer can be traced back to the input that caused it.
Round your inputs to the precision you actually know, and keep more precision than that in the intermediate steps.
Getting a Result You Can Trust
Run the calculation twice with slightly different inputs. A sensible calculator moves its output in proportion; a wild change points to a unit or a decimal point problem in what you entered.
Write the inputs down next to the answer. It takes a moment and it is the difference between a number you can explain and one you cannot.
A Worked Example
Working through an example, with skirt length set to 10, type set to 1, waist radius set to 5, the calculator returns fabric length of 17, and waist of 43.9823. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out fabric length?
Enter skirt length, type and waist radius. The calculator then works through the relationship and reports fabric length and waist.
What does the circle skirt actually calculate?
It takes skirt length, type and waist radius and converts them into fabric length and waist 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 skirt length?
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.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.