Block Library

Friendship Star

A simple and beautiful 3×3 star block made from four half-square triangle units, four plain corner squares, and one center square. The Friendship Star is one of the most recognizable beginner star blocks in quilting and has a long tradition of being made for gift quilts, community quilts, and blocks exchanged between friends — hence its name.

BeginnerTraditionalHalf-Square TrianglesGrid Piecing

Why quilters love the Friendship Star

True beginner star block — only squares and HSTs
Rich tradition as a gift and community quilt block
Strong star shape from just a few pieces
Easy to personalize with any two fabrics
Repeats beautifully across a full quilt top
Great first star block before Ohio Star or Sawtooth Star

Construction at a glance

What you'll work with

Four half-square triangle (HST) star point units
Four plain background corner squares
One center square
3×3 grid layout
No templates required

The Friendship Star is often one of the first star blocks a quilter makes. Unlike the Sawtooth Star (which uses Flying Geese) or the Ohio Star (which uses quarter-square triangles), the Friendship Star uses only HSTs — making it the most accessible star construction for beginners.

Common finished sizes

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Cutting guide

For a 9" Finished Block

This block uses two fabrics: a background and a star fabric. The center square can match either fabric or be a third accent fabric for added interest.

4 background squares at 3.5" × 3.5" (corner units)
1 center square at 3.5" × 3.5" (background, star fabric, or accent)
2 background squares at 3.875" × 3.875" (for HSTs)
2 star fabric squares at 3.875" × 3.875" (for HSTs)

The two pairs of 3.875" squares yield 4 HST units trimmed to 3.5" × 3.5" unfinished.

Oversized HST Method: Cut your HST squares at 4" instead of 3.875" and trim the finished units to exactly 3.5". You waste a tiny sliver of fabric but get a much easier and more accurate result — especially helpful when you are still building consistency with seam allowances.

Sizing formula: Each finished grid unit = 3"
Unfinished unit size = 3.5"
Oversized HST starting square = 4"

6" block = 2.5" corner squares, 2.5" HSTs trimmed (start at 3.25" or 3.5" oversized)
9" block = 3.5" corner squares, 3.5" HSTs trimmed (start at 4" oversized)
12" block = 4.5" corner squares, 4.5" HSTs trimmed (start at 5" oversized)

How to sew the Friendship Star

1
Draw a diagonal line on the wrong side of each 3.875" background square.
2
Pair one background square with one star fabric square, right sides together.
3
Sew 1/4" from each side of the drawn line.
4
Cut on the drawn line to yield two HST units.
5
Press each HST open toward the darker fabric.
6
Trim each HST unit to exactly 3.5" × 3.5". Repeat to make all 4 HST units.
7
Lay out all 9 pieces in a 3×3 grid: plain squares at the four corners, HSTs on the four sides with star fabric triangles pointing inward, center square in the middle.
8
Double-check all HST orientations before sewing — this is the most common place to catch a mistake.
9
Sew the top row (corner + HST + corner) and press seams toward the corner squares.
10
Sew the middle row (HST + center + HST) and press seams toward the center square.
11
Sew the bottom row (corner + HST + corner) and press seams toward the corner squares.
12
Join the three rows, nesting seams at intersections.
13
Press the block flat and confirm it measures 9.5" × 9.5" unfinished.

Accuracy tips

Make HSTs oversized and trim to exactly 3.5" — this is the single biggest improvement you can make to star point accuracy
Press HST seams toward the darker fabric to reduce show-through
Lay out all 9 pieces before sewing to confirm every HST faces the correct direction
Nest row seams at intersections by pressing adjacent rows in opposite directions
Check that all plain corner squares are cut to the same size as the trimmed HSTs

Common mistakes

Star Points Face the Wrong Direction: One or more HST units were placed or sewn with the star fabric triangle pointing outward instead of inward. Always lay out the full block before sewing and rotate any misaligned units.
Star Points Are Blunt or Cut Off: The HST seam fell slightly off the true diagonal, or the unit was trimmed unevenly. Use the oversized method and trim carefully with a ruler aligned to the diagonal seam.
Center Intersections Do Not Match: Row seams were pressed in the same direction instead of being nested. Press adjacent rows toward and away from the center square so seams lock at intersections.
Block Is Too Small: Seam allowances wider than 1/4" shrink each unit. Check with a scant 1/4" seam foot and measure each unit before assembling the block.

Fabric ideas

Classic two-color: cream or white background with a bold print or solid star
Signature quilts: different star fabric in each block, signed by a friend or family member
Scrappy stars with a consistent neutral background
Traditional navy, red, or green on cream for a historic look
Modern solids in complementary colors for a graphic effect
Low-volume background with a single bold feature print as the star fabric

Variations

Ohio Star (uses quarter-square triangles instead of HSTs for a more complex star point)
Sawtooth Star (uses Flying Geese units for star points)
Variable Star (elongated star points)
Scrappy Friendship Star (different fabrics in every block)
Friendship Star on point (rotated 45 degrees in the quilt setting)
Medallion quilt center (one oversized Friendship Star surrounded by borders)

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Browse all 9 classic quilt blocks with cutting guides and assembly instructions.

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