How do I cut diamonds from fabric?
Cut rectangles the size of your diamond plus seam allowance, then cut diagonally to get two diamonds.
Free quilting calculator
Diamond Calculator
Diamonds add visual interest to quilt designs. This calculator helps you plan diamond cutting and fabric needs.
Result
Diamond cutting estimate
24 diamonds need 12 rectangles cut at 4.5" × 6.5".
- Finished diamond size
- 4" × 6"
- Cut rectangle size
- 4.5" × 6.5"
- Rectangles needed
- 12
- Rectangles per row
- 9
- Rows needed
- 2
- Estimated yardage
- 0.375 yards
Cut rectangles the size of your diamond plus seam allowance, then cut diagonally to get two diamonds per rectangle.
Formula
Diamond height = finished height + seam allowance. Cut rectangle size = height × width with diagonal cuts.
Example calculation
A 4" × 6" finished diamond needs a 4.5" × 6.5" cut rectangle, then cut diagonally to get two diamonds.
Results are planning estimates. Always round up when buying fabric, especially for directional prints, shrinkage, fussy cutting, or cutting mistakes.
Related calculators
Fabric Yardage CalculatorEstimate fabric yardage from piece size, fabric width, quantity, seam allowance, and project type.Flying Geese CalculatorCalculate sky square and geese rectangle cutting sizes plus fabric yardage for flying geese quilt blocks.Half-Square Triangle CalculatorCalculate HST cutting sizes and yardage for the two-at-a-time method or traditional method. Enter finished size and block count.
Frequently asked questions
What is a square diamond?
A square diamond has equal width and height, essentially a square rotated 45 degrees.
Does this include seam allowance?
Yes. Enter your seam allowance and the calculator adds it to the cut size.
Can I use diamonds in quilt blocks?
Yes. Diamonds appear in many traditional and modern quilt patterns.