Slate Weight Calculator

Slate typically weighs 7-10 pounds per square foot for standard roofing or flooring applications, depending on thickness. A 1/2-inch thick slate tile weighs approximately 7.3 lb/ft², while 3/4-inch slate weighs about 10.9 lb/ft².

Slate (175 lb/ft³) is lighter than both granite (165-180 lb/ft³ average) and marble (170 lb/ft³), though the ranges overlap. The weight difference isn't dramatic, but slate's layered structure makes it easier to split into thinner, lighter tiles than granite.

Most modern residential floors can handle slate tile without reinforcement, as it weighs 7-10 lb/ft² installed. However, you should verify your subfloor can support at least 40-50 lb/ft² (including underlayment and mortar) and consult a structural engineer for older homes or upper floors.

Multiply length × width × thickness to get volume in cubic feet, then multiply by 175 lb/ft³. Add 10-15% for pallet and crating weight. Always verify dimensions in the same units before calculating.

Yes, slate density can range from 160-180 lb/ft³ depending on mineral composition and origin. Vermont and Pennsylvania slate tend to be denser (170-180 lb/ft³), while some imported varieties may be slightly lighter. The 175 lb/ft³ standard is a reliable average.