The full length of the opening.
Distance from the edge to the center of the first/last button.
Why Use This Tool?
- Calculates perfect center-to-center spacing instantly.
- Accounts for top and bottom ease/offsets.
- Generates a clear "Marking List" telling you exactly where to place the chalk.
- Visual preview helps you check if the spacing looks too crowded or sparse.
How to Use It
- 1. Select your units (cm or inches).
- 2. Enter the total length of the area (e.g., the shirt placket).
- 3. Enter your desired number of buttons.
- 4. Set the distance from the top and bottom edges (where the first/last button sits).
- 5. Click "Calculate" to get your measurements.
Frequently Asked Questions
Do I measure from the fabric edge or the seam?
Measure the finished length of the placket (after hemming/facing). The calculator assumes the "Top Distance" is from the finished top edge to the *center* of the first button.
Does this account for button size?
This calculator gives you the **Center-to-Center** distance, which is the professional standard for marking. The size of the button doesn't change where the center point goes, though it might affect how many buttons you *want* to use.
What is a standard shirt spacing?
For a standard shirt, buttons are usually spaced 8cm to 9cm (3 to 3.5 inches) apart.