How do I calculate how much epoxy resin I need for 7 m²?

General Calculation Method

The amount of epoxy resin needed is based on both area and thickness. As a rule of thumb, for each millimetre of thickness, you will need roughly 1.1 to 1.2 kg of resin per square metre. To calculate, multiply your chosen thickness (in mm) by the area and then by 1.1–1.2. For example, covering 7 m² at 2 mm thickness would require 7 × 2 × 1.15 = 16.1 kg (using the average of the range).

• Formula: Area (m²) × Thickness (mm) × 1.1–1.2 = Total kg required
• Always round up to account for mixing losses and minor surface irregularities.

Specific Guidance for Popular Applications

Worktops and Decorative Surfaces: When coating kitchen worktops or bathroom counters with marble or stone effect kits, use the “Stone Effect Collection” Epoxy Resin Countertop Kit. These kits are designed for surfaces up to 8 m², providing self-levelling resin for professional results. Choose a thickness of 1–2 mm for durable, wear-resistant finishes.

Floors and Outdoor Pebble Surfaces: For permeable outdoor floors, such as patios or footpaths, your resin needs will depend on aggregate size. The “Flowstone” Complete Kit or the “Trasparente” Binder typically require approximately 3% resin by weight of stones for coverage and durability.

When Precise Calculation Matters

Getting your calculation right is crucial for textured, porous, or uneven surfaces. Both roughness and absorption will slightly increase resin demand, so allow some extra when estimating quantities for natural stone, old surfaces, or groove-filled areas.