Subway Tile & Grout Calculator for Backsplashes
Classic 3×6 inch subway tile is the most popular choice for kitchen backsplashes and shower walls. Each tile covers 18 square inches (8 tiles per square foot).
Tile & Grout Estimator
Universal calculator for tile units, box cartons, pattern waste, and grout powder bags.
Covers 132 sq ft w/ +10% waste
Based on 12.5 sq ft per carton
~3 of 10lb carton or 1 of 25lb bag
Protects glossy glaze from scratching
Disclaimer: Calculations provided are estimates for preliminary material planning only. Actual yields vary based on subgrade compaction, site grading, waste, and local trade practices. QuickRenoTools assumes no liability for material shortages, structural failures, code non-compliance, vehicle overloads, or jobsite injuries. Verify all structural spans, retaining wall heights, and concrete mix designs with a licensed engineer, certified contractor, or local building authority prior to purchase and construction. Legal Disclaimer→
Subway Tile & Grout Calculator for Backsplashes — Quick Reference
Exact material counts across standard depths and load ratings.
| Backsplash Area | Subway Tiles (3×6") | Carton Boxes (12.5 sq ft) | Grout Powder | Pattern & Layout Notes |
|---|---|---|---|---|
| 15 sq ft (Small Galley Backsplash) | 132 subway tiles | 2 boxes (12.5 sq ft) | 1 box (10 lb grout) | Straight 1/2-offset pattern. |
| 30 sq ft (Standard Kitchen Backsplash) | 264 subway tiles | 3 boxes (12.5 sq ft) | 1 box (10 lb grout) | Includes range hood cutout. |
| 50 sq ft (Large Kitchen with Island) | 440 subway tiles | 4 boxes (12.5 sq ft) | 1 bag (25 lb grout) | 10% waste buffer included. |
Disclaimer: Calculations provided are estimates for preliminary material planning only. Actual yields vary based on subgrade compaction, site grading, waste, and local trade practices. QuickRenoTools assumes no liability for material shortages, structural failures, code non-compliance, vehicle overloads, or jobsite injuries. Verify all structural spans, retaining wall heights, and concrete mix designs with a licensed engineer, certified contractor, or local building authority prior to purchase and construction.
Related Tools for This Project
Building this project? Don't forget your sub-base gravel, reinforcement steel, or finishing supplies:
Step 1: Substrate Prep — Prepping cement backerboard or painting adjoining kitchen walls.
Step 2: Room Transitions — Installing new luxury vinyl plank or hardwood kitchen flooring.
Step 3: Mud Bed Mortar — Mixing pre-bagged mortar beds for tile shower pans or masonry surrounds.
Project Guide: Subway Tile & Grout Calculator for Backsplashes
When building a project of this scale, precision in your prep work directly impacts durability. Ensure you excavate below the topsoil layer down to undisturbed subsoil, and always install compacted aggregate base with edge forms braced at minimum 2-foot intervals.
Frequently Asked Questions: Subway Tile & Grout Calculator for Backsplashes
Common questions about bag calculations, ordering bulk vs bags, and trade standards.
How many 3x6 subway tiles are in a square foot?
There are exactly 8 subway tiles per square foot. Factor in 10% cutting waste by ordering 8.8 tiles per square foot.
Should I use sanded or unsanded grout for subway tile backsplashes?
Use unsanded grout. Subway tile backsplashes typically use 1/16" or 1/8" joints, where unsanded grout flows easily and will not scratch glossy ceramic glaze.
How many square feet of tile are in a standard box?
Most manufacturer cartons of 3×6 subway tile contain 10 to 12.5 square feet (80 to 100 tiles).
What trowel notch size should I use for 3x6 subway tile?
Use a 1/4" × 1/4" or 1/4" × 3/16" V-notch or square-notch trowel with polymer-modified thin-set mortar or premixed mastic.
How much grout do I need for a 30 sq ft backsplash?
A 30 sq ft subway tile backsplash requires approximately 6 to 8 lbs of grout (one standard 10 lb box).
Do I need to caulk or grout where the tile meets the countertop?
Always CAULK this joint with 100% color-matched silicone caulk. Never use grout, as movement between the wall and counter will crack hard grout.
How do I start tiling a kitchen backsplash?
Find the center line behind the kitchen cooktop/range (the visual focal point) and lay tiles outward toward the edges.
What cutting tool is best for subway tile?
A simple manual score-and-snap tile cutter makes crisp, chip-free cuts in seconds. Use an angle grinder or wet saw for outlet box cutouts.
How much extra tile should I order for a herringbone pattern?
Herringbone patterns require 15% to 20% extra tile to account for 45-degree angle cuts along top, bottom, and side borders.
Can you install subway tile directly over drywall?
Yes, in dry kitchen backsplash areas, you can tile directly over painted or primed drywall using premixed tile mastic.