How to Calculate Floor Leveling Mortar Quantity
Self-leveling mortar consumption is calculated as: Area (m²) × Depth (mm) × 2 kg/m²/mm. This 2 kg standard reflects the typical consumption rate of pre-mixed self-leveling compound at 1 mm thickness. For example, 50 m² at 10 mm depth requires 50 × 10 × 2 = 1,000 kg.
Real-world usage exceeds the theoretical figure due to floor slope variation and application loss. A 10–15% waste margin is standard. Bag count is rounded up to the next full bag. Maximum recommended depth per single pour is typically 5–30 mm; greater depths require layered applications.
Verify the bag size from the product label before entering it. Common sizes in the US are 50 lb (~22.7 kg) or 25 kg bags.
Frequently Asked Questions
When the floor level difference exceeds 3 mm or large-format tiles (600 mm+) are being installed. Smaller tiles can tolerate minor irregularities adjusted with tile adhesive.
Most products allow light foot traffic after 24 hours and tile installation after 72 hours. Always check the product datasheet — cure time varies by temperature and thickness.