Tile spacers typically come in these sizes: 1/16, 1/8, 3/16, 1/4 and 3/8 inches. You can match spacer size to field tile size, or go larger or smaller. The size of tile you're using: smaller tiles often look great with thinner grout lines, around 2-3mm. For larger tiles or tiles with uneven edges, however, wider grout lines (3-5mm) can help with alignment and hide any imperfections. Here are some tips to help you choose the correct size: For small tiles (up to 15cm), use 1-2mm spacers. For medium-sized tiles (up to 30cm), use 2-3mm spacers. For large tiles (over 30cm), use 3-6mm spacers. Tile spacers range in size from 1/8-inch to 3/8-inch. Typically, grout lines on a tiled wall, backsplash, or shower stall should be thinner, from 1/8-inch to 1/4-inch, while grout lines for floor tiles and other horizontal surfaces should be a bit wider, from about 1/4-inch to 3/8-inch. To achieve the desired aesthetics and functionality, here are recommendations for tile spacing based on tile dimensions: 2×2 ft Tiles: Optimal with a 3mm spacer, minimizing epoxy usage and maintaining a seamless appearance. 4×2 ft Tiles: Ideal with a 4mm spacer, ensuring proper alignment and Taking British Standards into consideration (as well as common practice) it is recommended that wall spacers are 2-3mm (with 2mm covering the majority of requirements) and floor spacers 3-5mm. Popular tile spacer sizes - not to scale. How to use tile spacers: pre-testing .

tile spacer sizes in mm