Blocking can turn uneven crochet motifs and knitted pieces into cleaner, more consistent finished projects. The right interlocking blocking boards provide a stable, measured surface for shaping while helping protect your work from pin damage and uneven tension.
We compared these 10 options by panel size, thickness, grid visibility, included pins, storage features, and overall flexibility for wet and dry blocking.
Best 10 Interlocking Blocking Boards Picks for 2026
Versatile Starter Pick
Boye Interlocking Blocking Boards
- Four 12-inch interlocking foam mats
- Grid lines support accurate shaping
- Works for wet and dry blocking
Best For: Flexible blocking for knitting, crochet, and needlepoint
Pin-Included Value Set
Mr. Pen Interlocking Blocking Mats
- Four 12-inch mats plus 50 T-pins
- Grid lines aid accurate sizing
- Supports wet blocking and drying
Best For: Crafters wanting a ready-to-use blocking kit
Complete Portable Kit
4-Pack Blocking Mats with T-Pins
- Four mats, 50 T-pins, and storage bag
- One-inch grids support precise sizing
- Resists water, heat, and steam
Best For: Frequent crafters wanting a portable all-in-one set
Large-Coverage Choice
- Nine 12-inch interlocking EVA mats
- Waterproof and heat-resistant construction
- Works for wet, dry, and steam setting
Best For: Medium to large projects needing expanded coverage
Flexible Blue Pick
CraftyManor 9-Piece Blocking Mats
- Nine rearrangeable 12-inch mats
- Includes 50 stainless steel T-pins
- Lightweight, non-slip, and steam resistant
Best For: Crafters wanting a flexible, expandable blocking surface
Fully Equipped Set
Unordinary Granny 9-Piece Blocking Set
- Extra-thick EVA boards with 1-inch grids
- Includes 150 T-pins and two storage bags
- Expandable to a 36-by-36-inch surface
Best For: Large or detailed projects needing many pins and storage
Compact Starter Option
4-Pack Interlocking Blocking Mats
- Four 12-inch interlocking boards
- Includes 50 T-pins and grid lines
- Works for wet blocking or dry projects
Best For: Beginners and small-to-medium fiber-craft projects
Extra-Thick Everyday Pick
Opstin Standard Blocking Mat Set
- 0.75-inch high-density EVA foam
- Nine configurable 12-inch mats
- Includes 150 T-pins and storage bag
Best For: Crafters seeking thick, flexible blocking support
Most Complete Accessory Set
Svartur Interlocking Blocking Mats
- Includes 12 crochet blocking combs
- Nine 12-inch grid-lined EVA mats
- Comes with 100 T-pins and storage bag
Best For: Crafters wanting a broad all-in-one blocking kit
Best for Firm Pinning
Opstin Extra-Thick Blocking Boards
- Extra-thick 0.75-inch EVA construction
- Flexible nine-piece configuration
- Includes 150 T-pins and storage bag
Best For: Projects needing secure, deep pin placement
Versatile Starter Pick – Boye Interlocking Blocking Boards
For knitters, crocheters, and needlepoint crafters looking for dependable interlocking blocking boards, this four-piece Boye set offers a flexible setup. Use one 12-by-12-inch mat for smaller projects or connect all four for larger pieces, with grid lines to support accurate shaping.
Best For: Beginners and experienced crafters who need flexible mats for wet or dry blocking.
Pros:
- Four interlocking mats support small and larger projects.
- Grid lines help with straight edges, measurements, and even stitches.
- Suitable for both wet blocking and drying.
Cons:
- The set includes four mats, which may provide less coverage than larger multi-piece sets.
- T-pins are not listed among the included components.
This is a straightforward choice when you want marked, adaptable blocking boards for several yarn crafts without committing to a larger setup.
Pin-Included Value Set – Mr. Pen Interlocking Blocking Mats
These interlocking blocking boards from Mr. Pen combine four 12-by-12-inch mats with 50 T-pins, making them a practical option for crafters who want the basic blocking accessories in one set. Grid lines assist with sizing, while the mats can be used separately or together.
Best For: Knitting and crochet crafters who want included T-pins for wet blocking and drying.
Pros:
- Includes four interlocking mats and 50 T-pins.
- Grid lines help with accurate project dimensions and even stitches.
- Individual mats can handle small projects, while all four accommodate larger pieces.
- Suitable for wet blocking and drying.
Cons:
- The supplied dimensions list the mats as 12 by 12 inches, so coverage is limited unless additional mats are added.
- The included T-pins may be unnecessary if you already have blocking pins.
With its included pins and clearly marked surface, this set is a convenient starting point for shaping blankets, home décor, and other yarn projects.
Complete Portable Kit – 4-Pack Blocking Mats with T-Pins
For shoppers seeking versatile interlocking blocking boards with accessories, this four-pack includes 50 T-pins and a storage bag. Each 12-by-12-inch mat has a one-inch grid, while the water-, heat-, and steam-resistant foam is designed for wet or steam blocking.
Best For: Frequent knitters and crocheters who value flexible layouts, pin storage, and resistance to wet or steam blocking.
Pros:
- Includes four mats, 50 T-pins, and a portable storage bag.
- One-inch aligned grids support precise sizing.
- Water-, heat-, and steam-resistant foam is suitable for multiple blocking methods.
- Non-slip backing helps keep the mats stable while shaping projects.
Cons:
- The four-mat layout offers less total coverage than the nine-mat ELSIER set.
- The mats are listed at approximately 0.39 inches thick, which may not suit every pinning preference.
This is a strong all-in-one option for crafters who want marked mats, included pins, and portable storage for projects ranging from small accessories to blankets.
Large-Coverage Choice – ELSIER 9-Pack Blocking Mats
When larger projects need more surface area, the nine-piece ELSIER set provides broad coverage through flexible interlocking mats. Each 12-by-12-inch EVA mat is reversible and suitable for wet, dry, or steam setting, though the unmarked surface is better suited to projects that do not require precise measuring.
Best For: Medium to large shawls, blankets, scarves, and other projects where expanded coverage matters more than measurement markings.
Pros:
- Nine interlocking mats create a generous blocking area.
- EVA construction is waterproof, heat-resistant, resilient, and durable.
- Suitable for wet, dry, and steam setting.
- Fully reversible mats offer flexible assembly.
Cons:
- The mats have no measurement markings.
- A slight new-material smell may be present when first opened.
- Consistent orientation may be needed for smooth interlocking.
Choose this set if your priority is broad, adaptable coverage for larger textile projects; look elsewhere if built-in grids are essential for exact dimensions.
Flexible Blue Pick – CraftyManor 9-Piece Blocking Mats
CraftyManor is a practical choice if you want interlocking blocking boards that can be rearranged for different crochet and knitting projects. The nine 12-by-12-inch mats provide a configurable surface, while the included T-pins and one-inch grid support accurate shaping.
Best For: Crafters who want a lightweight, expandable set with a non-slip backing and a blue, dirt-resistant-looking finish.
Pros:
- Nine mats can be spliced into different shapes, with gridlines designed to align.
- Includes 50 stainless steel T-pins for securing projects.
- PVC foam construction is lightweight, steam resistant, and 0.36 inches thick.
- Non-slip backing helps keep the assembled surface stable.
Cons:
- Includes fewer pins than some larger blocking sets.
- New mats may have a temporary material odor and may need ventilation for three to five days.
Choose this set when flexible layout options and easy storage matter more than maximum pin quantity. Its standard grid and steam-resistant design make it a versatile option for routine blocking.
Fully Equipped Set – Unordinary Granny 9-Piece Blocking Set
For shoppers seeking interlocking blocking boards with substantial accessories, the Unordinary Granny set combines nine extra-thick EVA mats with a large supply of pins and dedicated storage. Its 1-inch grid helps align motifs and edges across a 36-by-36-inch arrangement.
Best For: Crochet and knitting projects that need a thicker surface, many pins, and organized storage for boards and accessories.
Pros:
- Nine 12.6-by-12.6-inch, 0.75-inch-thick EVA boards create a stable expandable surface.
- Includes 150 rust-resistant T-pins, a felt board bag, and a cotton accessory pouch.
- Dense EVA is water-repellent and steam resistant for wet or steam blocking.
- Clear 1-inch grid lines support precise shaping and alignment.
Cons:
- The complete set weighs 3.1 pounds, making it less lightweight than simpler kits.
- The extra-thick boards and included storage may take more room to store.
This is the strongest all-in-one option of the three for shoppers who value thickness, pin quantity, and accessories. Additional sets can expand the working area for sweaters, shawls, and other large pieces.
Compact Starter Option – 4-Pack Interlocking Blocking Mats
This four-piece kit offers a straightforward entry point for anyone comparing interlocking blocking boards for knitting, crochet, or needlepoint. Use individual 12-by-12-inch mats for small pieces or connect all four for a larger 24-by-24-inch working area.
Best For: Beginners and crafters handling small-to-medium projects who want a simple set with included pins.
Pros:
- Four interlocking 12-by-12-inch boards can be used separately or together.
- Includes 50 T-pins for holding projects in place.
- Grid lines help with accurate shaping and alignment.
- Suitable for wet blocking or dry projects, including crochet and needlepoint work.
Cons:
- Offers less total coverage than the nine-piece sets.
- The supplied notes do not specify the board material or steam-resistance rating.
- White boards may show craft residue more readily than darker-colored mats.
Consider this set if you want a smaller, simpler blocking setup without committing to nine tiles. It is a practical fit for routine small projects, while larger blankets or garments may require additional coverage.
Extra-Thick Everyday Pick – Opstin Standard Blocking Mat Set
For shoppers comparing interlocking blocking boards, this nine-piece Opstin set offers a flexible workspace for knitting, crochet, lace, and needlepoint. Its 0.75-inch EVA foam, gridlines, T-pins, and storage bag make it a practical all-around option.
Best For: Crafters who want extra-thick, configurable mats with a generous pin supply.
Pros:
- Extra-thick 0.75-inch EVA mats help hold pins firmly.
- Nine 12-by-12-inch squares can be arranged into a 36-by-36-inch surface or other shapes.
- Includes 150 T-pins and a storage bag.
- Waterproof surface supports dry, cold, or wet blocking.
Cons:
- The set is available in pink, which may not suit every workspace.
- The supplied details do not specify a permanently attached or rigid board surface.
This is a strong choice when pin retention and setup flexibility matter most. The extra thickness is especially useful for projects that need firm blocking support.
Most Complete Accessory Set – Svartur Interlocking Blocking Mats
This Svartur set stands out among interlocking blocking boards by combining nine grid-lined mats with both T-pins and small crochet blocking combs. It is designed to handle projects ranging from granny squares to larger pieces while remaining easy to store.
Best For: Beginners and experienced crafters who want combs, pins, mats, and a storage bag in one kit.
Pros:
- Complete kit includes nine mats, 100 T-pins, 12 crochet blocking combs, and a storage bag.
- Each square measures 12 inches and is suitable for varied project sizes.
- Gridlines support accurate shaping and alignment.
- High-density EVA material is suitable for wet blocking.
Cons:
- At 0.47 inches thick, the mats are thinner than the 0.75-inch Opstin alternatives.
- The included pin count is lower than some competing sets.
The accessory mix makes this a versatile starter kit, particularly for crocheters who will use blocking combs as well as individual pins. Choose it over a thicker set if broader tool coverage is the priority.
Best for Firm Pinning – Opstin Extra-Thick Blocking Boards
If firm pin placement is central to your workflow, these interlocking blocking boards provide 0.75-inch-thick EVA mats designed to hold T-pins deeply. The nine 12-inch squares can be configured for different projects and pack into the included storage bag.
Best For: Knitters and crocheters who prioritize thick foam, flexible layouts, and a large supply of T-pins.
Pros:
- 0.75-inch extra-thick mats help keep pins secure.
- Nine 12-by-12-inch pieces can form a 36-by-36-inch layout or other shapes.
- Includes 150 T-pins and a storage bag.
- Waterproof, grid-lined surface supports wet, cold, and dry blocking.
Cons:
- The supplied details do not list crochet blocking combs.
- The separate mat pieces require assembly for each layout.
This set is a good match for larger or tension-sensitive projects that benefit from deep pin placement. Its modular design also lets you adjust the workspace instead of being limited to one fixed shape.
How We Picked the Best Interlocking Blocking Boards
We focused on the features that matter most when blocking garments, motifs, shawls, blankets, and small accessories. Each set was assessed for panel count, modularity, surface markings, foam thickness, included accessories, and ease of storage. We also considered whether a kit offers enough pins or combs for larger projects and whether its design can adapt to different shapes.
Interlocking Blocking Boards are especially useful because individual squares can be arranged into a larger working area or separated for small pieces. Grid lines are another important advantage, making it easier to maintain consistent dimensions across repeated motifs and symmetrical projects.
Quick Comparison
| Feature | What to look for | Why it matters |
|---|---|---|
| Panel count | Four to nine or more pieces | Determines working area and layout flexibility |
| Thickness | Standard or extra-thick foam | Thicker mats provide more pin depth and stability |
| Gridlines | Clearly printed measurements | Helps produce even edges and matching dimensions |
| Pins and combs | T-pins, blocking combs, or both | Reduces the need to buy accessories separately |
| Storage | Bag or compact stackable design | Keeps mats and pins organized between projects |
Key Buying Factors for Interlocking Blocking Boards
Size and Expandability
Check the dimensions of each square and the total number of panels. A four-piece set may suit scarves, washcloths, and individual motifs, while a nine-piece set gives you more room for larger squares or garment sections. Modular boards can also be rearranged to match unusual shapes.
Foam Thickness and Pin Security
Extra-thick foam generally holds T-pins more securely and is less likely to flex against a hard surface. This matters when stretching dense crochet, heavy yarn, or pieces that need firm tension. Use rust-resistant pins and avoid forcing them at extreme angles.
Grid Accuracy and Surface Protection
Look for sharp, easy-to-read gridlines that remain useful when aligning corners and edges. Place the mats on a protected, moisture-tolerant surface for wet blocking, and allow projects to dry fully before removing the pins.
Included Accessories
Compare the number of T-pins, the availability of blocking combs, and whether a storage bag is included. More pins are helpful for lace and large pieces, while combs can speed up straight-edge blocking on repetitive projects.
Who Should Buy Which Interlocking Blocking Boards?
Choose a compact four-piece set if you mainly block small crochet motifs, socks, scarves, or individual garment sections. A nine-piece kit is the better choice for blankets, shawls, sweaters, and projects that need a broader continuous layout. If you frequently block dense materials or want stronger pin hold, prioritize extra-thick foam. Buyers who value convenience should select a kit with ample pins and a storage bag, while experienced crafters may prefer to choose their own accessories and focus on panel size and grid quality.