Resin Coverage Calculator

Resin needed = Area × Thickness ÷ 10 × Resin density — Coating is area times thickness, and the only trap is units: square centimetres multiplied by millimetres have to be divided by 10 to land on cubic centimetres, which are millilitres. A 60 × 60 cm tray, 3,600 cm², at 3 mm takes 1,080 mL, or 1,188 g at a density of 1.1. Broad surfaces such as tabletops are rarely poured deeper than about 3 mm at once, so the thickness gets split into layers — enter one layer's thickness and repeat the pour rather than recalculating each time. Self-levelling resin evens itself out on a level surface, but half a degree of tilt thickens the low edge and starves the high one, so a spirit level matters more than the arithmetic.

With Area 3,600cm², Thickness 3mm, Resin density 1.1g/cm³, the answer is Resin needed 1,188g.

Enter Area, Thickness, Resin density. The result recalculates as you type, and an empty box counts as zero.

Changing only Area (cm²) moves the answer to Area (cm²) 1,800 → Resin needed (g) 594 and Area (cm²) 7,200 → Resin needed (g) 2,376. The table below lays out five steps.

Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.

Allow for what runs off. An unedged surface — a tabletop, the outside of a tray — loses resin over the sides, so budget 10–20% above the figure and either tape a dam or catch the drips. Always mix 5–10% extra for what clings to the cup and stick. Pouring the whole depth at once concentrates the exotherm and the slab yellows or cracks, so respect the maximum pour depth on the bottle. Porous surfaces such as bare wood drink the first coat, so seal them with a thin flood coat before the real layer.