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    Home » Quilts » Free Patterns

    Half Square Triangle Quilt Layouts & Free Baby Quilt Pattern

    Updated: Apr 27, 2022 by Melissa Mortenson · This post may contain affiliate links · This blog generates income via ads · 3 Comments

    coral and white baby quilt hanging on fence

    Turn simple half-square triangle quilt blocks into 10 different baby quilts using our free baby quilt pattern and half square triangle quilt layout printable!

    close up of coral and white baby quilt

    Earlier this year, I played around with some quilt layout ideas and snapped a few photos to share on my Instagram stories. I was surprised at how many people messaged me asking for more information about the quilt layouts I was considering.

    Table of Contents
    • What is a Half Square Triangle Quilt Block?
    • How to do Make an HST Block?
    • What Size is the Finished Baby Quilt?
    • Quilting Terminology Tip!
    • Half Square Triangle Quilt Layouts
    • Free Printable Layout Guide
    • Instructions
    woman placing half square triangle quilt blocks on wall

    I created 64 half square triangle quilt blocks, arranged them into 8 rows with 8 blocks in each row, and then began rotating the blocks to create different layouts. It was fun to share the process on my IG stories, and I ended up answering quite a few DM’s regarding the layout ideas I was contemplating.

    diagram of coral and white half square triangle quilt blocks arranged into 8 rows of 8 squares

    Did you know that simply rotating the direction of the seam of a half square triangle quilt block yields a totally different quilt pattern?

    I thought today I’d share with you 10 SIMPLE Half Square triangle quilt layouts, along with a basic quilt pattern to create a 48″ square baby quilt.

    diagram of coral and white half square triangle quilt blocks arranged into 8 rows of 8 squares

    All of the layouts are created with the SAME 64 blocks. The only thing that changes in each layout is the direction of the angles on the triangles.

    First up a few basics.

    What is a Half Square Triangle Quilt Block?

    (fabrics in the quilt are from the Ahoy! Mermaids collection)

    A Half Square Triangle quilt block is commonly referred to as an HST block (just a simple abbreviation). It comprises two right triangle fabric pieces that are sewn together along the hypotenuse (the long side). They are widely considered to be a building block for many other quilt blocks.

    How to do Make an HST Block?

    There are a hundred different ways to make a half-square triangle block. Each quilter you talk to probably has their own method. I’ve outlined my method step by step for you guys. I prefer this method because it allows you to make an HST block in ANY size that you’d like. It also allows a bit of “wiggle room” when trimming your blocks if your piecing wasn’t perfect (and mine rarely is!)

    hand holding white, green and blue quilt blocks on white cutting mag

    I like to create my hst blocks from 2 squares of fabric. I sew two seams, each ¼″ out from the diagonal center, then cut the squares apart and square them up. If you’d like more details, hop on over to the blog post.

    What Size is the Finished Baby Quilt?

    close up of coral and white baby quilt

    The baby quilt pattern I’m sharing with you today is 48″ x 48″. It comprises 8 blocks across and 8 down that are 6″ when finished (6 x 8 = 48). If you want your quilt larger or smaller, increase the size of the triangles or increase the number of the blocks!

    coral and white quilt draped over chair by pool

    Quilting Terminology Tip!

    When quilt patterns refer to the size of a quilt block, they are usually referring to the FINISHED size of the block. The finished size of the block is the size the block is AFTER it is sewn into the final quilt.

    close up of coral and white baby quilt

    So a 6 ½″ quilt block, sewn into a quilt becomes 6″ square (you lose ¼″ on each side when the block is sewn into the quilt). The blocks in today’s quilt are 6 ½″ square after you create them but are referred to as 6″ blocks since that is the size they are in the FINISHED quilt.

    Summertime Pinwheel Quilt - so easy you can make it with a bunch of layer cakes or 10" stackers. A simple summer quilt to make

    This summer quilt was also created using only half-square triangle blocks. It’s much larger than the baby quilt in today’s post. The blocks are 9″ when finished, and there are 8 blocks across and 10 blocks down in the quilt. See how that works? Pretty cool, huh!?

    Half Square Triangle Quilt Layouts

    navy and white herringbone quilt on white wall

    Another example is this herringbone baby quilt. It is comprised of 9 rows with 6 blocks in each row. Each block is 6″ finished. All of the blocks are just simple half-square triangles!

    I’ve taken the time to mock up 10 different quilt layouts using 64 half-square triangle blocks. This is just a small sampling of the arrangements you can make. I could keep going and think of at least another 10 layouts. But these are 10 that I love and think you will too.

    Free Printable Layout Guide

    I’ve created a printable with all 10 layouts. Print it off at home and use it as a reference as you create your quilt. Note: all of these layouts work with 8 across layouts.

    If you fill out the form below, we will send you the printable.

    coral and white quilt draped over chair by pool

    Instructions

    close up of coral and white baby quilt
    Pin It
    Print
    4.67 from 3 votes

    Half Square Triangle Baby Quilt Pattern

    Create a graphic, modern baby quilt using our free half square triangle quilt pattern!
    Prep Time1 hr
    Active Time4 hrs
    Total Time5 hrs
    Yield: 1 Quilt
    Author: Melissa Mortenson

    Tools

    • Sewing Machine
    • Basic Sewing Tools
    • Quilt Ruler
    • Rotary Cutter
    • Cutting Mat
    • Binding Clips
    • 6 ½" Quilt Ruler (optional) I prefer the Bloc Loc Ruler

    Materials

    • 7 7" x WOF* Strips of fabric in various prints. They do not all need to be the same print but should be the same color.
    • 7 7" x WOF* Strips of fabric in various prints. They do not all need to be the same print but should be significantly different from the other strips of fabric- either lighter or darker.
    • 1 ½ Yards 60" wide backing fabric OR
    • 3 yards 42" wide backing fabric
    • ⅜ yard Binding fabric
    • 1 piece Batting at least 50" x 50"

    Instructions

    Cutting

    • Cut your 7" wide strips of fabric into 7" squares. Cut 32 squares from your first color of fabric and 32 squares from the second color of fabric.

    Create the Half Square Triangles

    • Draw a diagonal line on the wrong side of the 32 squares cut from lighter fabric.
      The October Quilt Block of the Month, a variation of a simple pinwheel block. Join in the block of the month series and make a quilt one month at a time.
    • Layer one darker and one lighter square, right sides facing and stitch ¼" on each side of the line you drew.
      The October Quilt Block of the Month, a variation of a simple pinwheel block. Join in the block of the month series and make a quilt one month at a time.
    • Cut apart along the line, and trim up to 6 ½" square. Repeat for all squares.
      The October Quilt Block of the Month, a variation of a simple pinwheel block. Join in the block of the month series and make a quilt one month at a time.
    • For a step by step more detailed tutorial to create Half Square Triangles (along with a lot of tips) please visit our Half Square Triangle Tutorial.

    Assemble Quilt

    • Arrange the 64 sewn blocks into 8 rows with 8 blocks in each row. Refer to the printable for layout suggestions and ideas.
    • Quilt and bind as desired.

    Notes

    *WOF = Width Of Fabric. Even though most quilting fabrics are 42″ wide, it is rare that you can use all 42″.  The calculations in this pattern assume you can get five 7″ squares from one 7″ x WOF strip. If your fabric is slightly larger or has a very small selvage, you may be able to get six squares. 
     
    Fabrics used in the example quilt are from the Ahoy! Mermaid’s fabric collection by Melissa Mortenson for Riley Blake Designs. 

    Copyright Notice

    ©www.polkadotchair.com – This is Copyrighted Content. You may NOT copy it, distribute it, sell it or package it with a kit. You may NOT teach a for-fee class using it. All items are for personal use only. No commercial use is allowed.

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    coral and white baby quilt hanging on fence

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    About Author

    Melissa Mortenson

    Melissa Mortenson is a blogger, designer, and content creator. She is the Polka Dot Chair blog founder and has been sharing fresh and creative ideas with readers since 2008. She is the author of “Project Teen, Handmade Gifts your Teen will Actually Love.” Her work and designs have been featured on HuffPost, TODAY, Pioneer Woman, HGTV, BuzzFeed, Better Homes & Gardens, and many other established publications. Her first fabric line, “Derby Style,” debuted in January 2015 through Riley Blake Designs.  Additional fabric collections have followed it in subsequent years. A mom of 3, she considers herself lucky to be living in Kentucky.

    Reader Interactions

    Comments

    1. Barbara says

      June 15, 2021 at 1:45 pm

      I love your work.

      Reply
    2. Carolyn Lewis says

      July 22, 2021 at 12:40 am

      I look forward to making your 1/2 square triangle baby block quilt. Thank you for the free pattern and all the different layouts for the blocks.
      Carolyn

      Reply
    3. JoAnne Otto says

      August 10, 2021 at 2:02 pm

      Thank you for sharing this pattern. I am excited to try it for a baby quilt.

      Reply

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