Grout Calculator — Free Online Tool
Grout is the forgotten line item in every tile project — until you're mid-job with a half-empty bag. This grout calculator converts your tiled square footage into bag counts for standard installations.
What is the Grout Calculator?
A 10-pound bag of grout covers roughly 50 square feet of typical floor tile with 1/4-inch joints. Wider joints and smaller tiles eat more grout (more joint length per square foot), while large tiles with tight joints use less — the 10% buffer in this calculator covers normal variation.
Choose sanded grout for joints 1/8 inch and wider, unsanded for narrower — the wrong type causes cracking or washout. Mix only what you can use in 30 minutes; grout waits for no one. This grout calculator rounds up to whole bags because an opened bag doesn't store well once humidity gets in.
How to use this calculator
- Measure the tiled area in square feet.
- Enter it and click Calculate Grout.
- Choose sanded vs unsanded based on your joint width.
- Mix in small batches you can use within 30 minutes.
Formula
Frequently asked questions
Sanded or unsanded grout — which do I need?
Sanded for joints 1/8 inch and wider; unsanded for narrower joints. This grout calculator's quantity works for either.
How much grout per square foot?
Roughly 0.2 lbs per sq ft for typical floor tile — a 10-lb bag covers ~50 sq ft.
Can I store an opened bag of grout?
Poorly — moisture ruins it. Buy fresh bags for each project phase.
Is epoxy grout worth it?
It's stain-proof and tougher, but harder to install and pricier — great for kitchens, overkill for low-traffic areas.