How much does a granite countertop weigh?

A 3cm granite countertop weighs 18-20 lbs per square foot . A typical 30 sq ft kitchen countertop weighs 540-600 lbs, while a large 50 sq ft installation weighs 900-1,000 lbs. Use our granite calculator for exact results.

Can standard kitchen cabinets support granite countertops?

Yes, standard kitchen base cabinets can typically support 3cm granite countertops without modification. The weight is distributed across multiple cabinets. However, islands over 30 sq ft or floating vanities may need reinforced cabinets, center support legs, or wall blocking.

Should I choose 2cm or 3cm granite for my countertop?

3cm (1.25") is the industry standard — it's 46% heavier than 2cm but doesn't require plywood underlayment. 2cm (0.75") granite is lighter and less expensive but needs plywood support underneath. For islands and overhangs, 3cm provides better structural integrity.

How much does a full granite slab weigh?

A standard granite slab (approximately 54 sq ft at 9×6 feet) weighs about 700 lbs at 2cm or 1,026 lbs at 3cm . Full slabs require professional handling with specialized lifting equipment and a crew of 2-4 people.

How do I calculate granite weight for a kitchen island?

Multiply length × width (in feet) to get square footage, then multiply by 19 lb/ft² for 3cm granite or 13 lb/ft² for 2cm. Example: A 4×8 ft island = 32 sq ft × 19 = 608 lbs . Overhangs exceeding 10 inches need steel corbels or support brackets.

Granite Countertop Weight Guide | ProWeightCalculator

Why Granite Countertop Weight Matters

A typical kitchen granite countertop weighs 500–1,000+ pounds. This weight impacts your project in several critical ways:

Cabinet structural capacity — base cabinets must support the distributed load without sagging or failure
Floor load requirements — heavy islands concentrate weight on a small footprint
Transport and delivery — full slabs weigh 800–1,200 lbs and require professional handling
Installation labor planning — 2–4 installers needed depending on slab size and access

Last updated: February 2026

All Use Cases All Calculators Stone Category Resources

Granite Countertop Weight: Installation Planning Guide

Why Granite Countertop Weight Matters

Use Case 1: Kitchen Countertops

Use Case 2: Bathroom Vanities

Use Case 3: Kitchen Islands

Use Case 4: Outdoor Countertops

How to Calculate Granite Countertop Weight

2cm vs 3cm Granite Weight Comparison

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