Flagstone Calculator
Calculate tons of flagstone needed for patios, paths, and stepping stones
Enter Dimensions
Enter your dimensions above to see results
Tips & Notes
- •At 1.5" thickness, one ton of flagstone covers approximately 80–100 sq ft.
- •Natural flagstone (bluestone, slate, limestone, sandstone) varies widely in density.
- •Order 15–20% extra for irregular shapes — cuts and waste are higher than pavers.
- •Set in mortar on a concrete base for permanent installations; dry-laid in sand for flexible paths.
- •Thickness affects load capacity: 1"–1.5" for foot traffic, 2"+ for vehicle areas.
Recommended Products
Popular items for this project — links may earn a commission.
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Materials & Supplies
MasonryDefender Penetrating Concrete Sealer — 1 Gallon
Deep penetrating silane-siloxane water repellent for driveways & patios
$35Amazon
Acri-Soy Penetrating Concrete Sealer — 1 Gallon
Non-toxic, odorless sealer for brick, patio pavers, stone & masonry
$25Amazon
Quikrete 50 lb Fast-Setting Concrete Mix
No mixing required, pour dry into hole and add water, sets in 20–40 min
$18Amazon
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Tools You'll Need
48"x8" Aluminum Magnesium Concrete Bull Float Kit
4 extendable handles, adjustable bracket, professional concrete finishing
$55Amazon
MARSHALLTOWN 16" Round End Magnesium Hand Float (143D)
Lightweight mag blade, DuraSoft handle, eliminates float marks, Made in USA
$22Amazon
Bon 12-585 6"x4-1/2" Bronze Hand Concrete Groover
5/8" depth x 5/8" width bit, wood handle, creates control joints in slabs
$28Amazon