How to Use the Hexagon Quilt Calculator
Our Hexagon Quilt Calculator helps you plan your perfect hexagon quilt by calculating exactly how many hexagons and half-hexagons you'll need — along with an estimate of the fabric and cost required. Simply enter your quilt dimensions and hexagon size to get started.
Step 1: Choose Your Unit System
Select Imperial (inches) if you work in the US customary system, or Metric (cm) if you prefer centimeters. The calculator will automatically update all default values and labels to match your chosen system.
Step 2: Enter Quilt Dimensions
Enter the desired width and length of your finished quilt. For example, a standard twin bed quilt might be 85" × 95" (216 cm × 241 cm).
Step 3: Set Hexagon Side Length
Enter the side length of each hexagon — the length of one straight edge. Common quilting hexagon sizes range from 1" (2.5 cm) for intricate patterns to 6" (15 cm) for faster projects. A 3" (7.6 cm) hexagon is a popular all-purpose choice.
- Smaller hexagons create detailed patterns but require more pieces and cutting time.
- Larger hexagons go together faster and use larger fabric prints effectively.
Step 4: Seam Allowance
The standard seam allowance for hexagon quilting is ¼ inch (0.635 cm). The calculator adds this to each hexagon when estimating fabric requirements. Hand-stitched English paper piecing traditionally uses a slightly different allowance (often ⅜ inch), so adjust as needed for your method.
Step 5: Cost Estimation (Optional)
If you'd like to estimate fabric cost, select your preferred currency and enter the price per yard (or per meter for metric). The calculator will multiply this by the total fabric yardage required to give you an estimated cost. Fabric prices are based on a standard 44-inch (112 cm) wide quilting cotton.
Understanding the Results
Columns and Rows
The calculator returns the number of columns (hexagons across the width) and rows (hexagons down the length) in your quilt layout. Hexagons are arranged in a flat-top orientation with alternating rows offset by half a hexagon.
Full Hexagons and Half Hexagons
In a staggered hexagon layout, every other row is offset by half a hexagon width. This means the edges of those rows need half hexagons to fill in the gaps and create a straight quilt edge. The calculator tells you exactly how many of each you need.
A half hexagon is simply a regular hexagon cut in half from one vertex to the opposite vertex — creating a symmetrical piece that perfectly fills the edge gaps.
Fabric Needed
Fabric requirements are calculated based on the total area of all hexagon pieces (including seam allowance), divided by the standard 44-inch (112 cm) fabric width. This gives you the number of yards (or meters) of fabric to purchase. Always buy a little extra for cutting mistakes and fabric matching.
How Hexagon Geometry Works
A regular hexagon with side length s has the following dimensions:
- Flat-to-flat width: √3 × s (approximately 1.732 × s)
- Tip-to-tip height: 2 × s
- Area: (3√3 / 2) × s² (approximately 2.598 × s²)
In a flat-top hexagon grid, columns are spaced √3 × s apart horizontally, and the vertical distance between row centers is 1.5 × s (since alternating rows overlap by ½ × s vertically).
Hexagon Quilting Tips
- English Paper Piecing (EPP) is the most popular method for hexagon quilts. You baste fabric around paper templates, then whipstitch the pieces together by hand.
- Pre-cut hexagon templates are available in many sizes at fabric stores, or you can print free templates online and cut your own.
- Fabric selection: Use a variety of prints and solids to create striking patterns like "Grandmother's Flower Garden" or modern geometric designs.
- Half hexagons can be cut from full hexagon templates by folding them exactly in half — or use a separate half-hexagon template for more precision.
- Binding: Add at least 10–12 inches of extra fabric for quilt binding. A quilt binding calculator can help you determine the exact amount needed.
Frequently Asked Questions
How many hexagons do I need for a 90" × 90" quilt with 4" hexagons?
You will need approximately 184 full hexagons and 14 half hexagons (about 13 columns and 15 rows) to make a 90" × 90" quilt with 4" hexagons.
How much fabric do I need for a hexagon quilt?
Fabric requirements depend on your quilt size and hexagon size. Use the calculator above to get an accurate estimate. As a rule of thumb, add 10–15% extra to account for cutting waste and pattern matching. For fabric with directional prints, you may need even more.
What is a half hexagon and why do I need them?
In a staggered hexagon grid, alternating rows are offset by half a hexagon width. This creates gaps at the left and right edges that need to be filled with half hexagons to create a straight quilt edge. Without half hexagons, your quilt would have a zigzag edge.
Can I make a quilt entirely from half hexagons?
Yes! A quilt made entirely from half hexagons creates a fascinating "Inner City" or "tumbling blocks" effect. The same calculation principles apply — just plan your layout accordingly.
What is the most popular hexagon size for quilting?
Common sizes include 1" (very intricate), 2" (detailed), 3" (popular all-purpose), 4" (faster to piece), and 6" (large-scale). Beginners typically start with 2"–3" hexagons for a good balance between detail and speed.